Snitch Cluster peripherals

This section documents the registers exposed by the Snitch cluster to interface with various cluster-level peripherals, including the performance counters.

snitch_cluster_peripheral_reg address map

• Absolute Address: 0x0
• Base Offset: 0x0
• Size: 0x1C0

Offset	Identifier	Name
0x000	perf_regs	—
0x180	scratch[0]	—
0x188	scratch[1]	—
0x190	scratch[2]	—
0x198	scratch[3]	—
0x1A0	cl_clint_set	—
0x1A8	cl_clint_clear	—
0x1B0	icache_prefetch_enable	—
0x1B8	unused	—

perf_regs register file

• Absolute Address: 0x0
• Base Offset: 0x0
• Size: 0x180

Offset	Identifier	Name
0x000	perf_cnt_en[0]	—
0x008	perf_cnt_en[1]	—
0x010	perf_cnt_en[2]	—
0x018	perf_cnt_en[3]	—
0x020	perf_cnt_en[4]	—
0x028	perf_cnt_en[5]	—
0x030	perf_cnt_en[6]	—
0x038	perf_cnt_en[7]	—
0x040	perf_cnt_en[8]	—
0x048	perf_cnt_en[9]	—
0x050	perf_cnt_en[10]	—
0x058	perf_cnt_en[11]	—
0x060	perf_cnt_en[12]	—
0x068	perf_cnt_en[13]	—
0x070	perf_cnt_en[14]	—
0x078	perf_cnt_en[15]	—
0x080	perf_cnt_sel[0]	—
0x088	perf_cnt_sel[1]	—
0x090	perf_cnt_sel[2]	—
0x098	perf_cnt_sel[3]	—
0x0A0	perf_cnt_sel[4]	—
0x0A8	perf_cnt_sel[5]	—
0x0B0	perf_cnt_sel[6]	—
0x0B8	perf_cnt_sel[7]	—
0x0C0	perf_cnt_sel[8]	—
0x0C8	perf_cnt_sel[9]	—
0x0D0	perf_cnt_sel[10]	—
0x0D8	perf_cnt_sel[11]	—
0x0E0	perf_cnt_sel[12]	—
0x0E8	perf_cnt_sel[13]	—
0x0F0	perf_cnt_sel[14]	—
0x0F8	perf_cnt_sel[15]	—
0x100	perf_cnt[0]	—
0x108	perf_cnt[1]	—
0x110	perf_cnt[2]	—
0x118	perf_cnt[3]	—
0x120	perf_cnt[4]	—
0x128	perf_cnt[5]	—
0x130	perf_cnt[6]	—
0x138	perf_cnt[7]	—
0x140	perf_cnt[8]	—
0x148	perf_cnt[9]	—
0x150	perf_cnt[10]	—
0x158	perf_cnt[11]	—
0x160	perf_cnt[12]	—
0x168	perf_cnt[13]	—
0x170	perf_cnt[14]	—
0x178	perf_cnt[15]	—

perf_cnt_en register

• Absolute Address: 0x0
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x8
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x10
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x18
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x20
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x28
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x30
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x38
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x40
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x48
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x50
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x58
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x60
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x68
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x70
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_en register

• Absolute Address: 0x78
• Base Offset: 0x0
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Bits	Identifier	Access	Reset	Name
0	enable	rw	0x1	enable

enable field

Enable a particular performance counter to start tracking.

perf_cnt_sel register

• Absolute Address: 0x80
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0x88
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0x90
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0x98
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xA0
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xA8
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xB0
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xB8
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xC0
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xC8
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xD0
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xD8
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xE0
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xE8
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xF0
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt_sel register

• Absolute Address: 0xF8
• Base Offset: 0x80
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Select the metric that is tracked for each performance counter.

Bits	Identifier	Access	Reset	Name
15:0	hart	rw	—	hart
31:16	metric	rw	—	metric

hart field

Select from which hart in the cluster, starting from 0, the event should be counted. For each performance counter the cores can be selected individually. If a hart greater than the cluster's total hart size is selected the selection will wrap and the hart corresponding to hart_select % total_harts_in_cluster will be selected.

metric field

Select the metric that is tracked for each performance counter

perf_cnt register

• Absolute Address: 0x100
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x108
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x110
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x118
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x120
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x128
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x130
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x138
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x140
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x148
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x150
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x158
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x160
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x168
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x170
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

perf_cnt register

• Absolute Address: 0x178
• Base Offset: 0x100
• Size: 0x8
• Array Dimensions: [16]
• Array Stride: 0x8
• Total Size: 0x80

Performance counter. Set corresponding perf_cnt_sel register depending on what performance metric and hart you would like to track.

Bits	Identifier	Access	Reset	Name
47:0	perf_counter	rw, wclr	—	—

perf_counter field

Performance counter

scratch register

• Absolute Address: 0x180
• Base Offset: 0x180
• Size: 0x8
• Array Dimensions: [4]
• Array Stride: 0x8
• Total Size: 0x20

Scratch registers. Used in the bootrom for various purposes.

Bits	Identifier	Access	Reset	Name
31:0	scratch	rw	0x0	—

scratch field

Scratch register

scratch register

• Absolute Address: 0x188
• Base Offset: 0x180
• Size: 0x8
• Array Dimensions: [4]
• Array Stride: 0x8
• Total Size: 0x20

Scratch registers. Used in the bootrom for various purposes.

Bits	Identifier	Access	Reset	Name
31:0	scratch	rw	0x0	—

scratch field

Scratch register

scratch register

• Absolute Address: 0x190
• Base Offset: 0x180
• Size: 0x8
• Array Dimensions: [4]
• Array Stride: 0x8
• Total Size: 0x20

Scratch registers. Used in the bootrom for various purposes.

Bits	Identifier	Access	Reset	Name
31:0	scratch	rw	0x0	—

scratch field

Scratch register

scratch register

• Absolute Address: 0x198
• Base Offset: 0x180
• Size: 0x8
• Array Dimensions: [4]
• Array Stride: 0x8
• Total Size: 0x20

Scratch registers. Used in the bootrom for various purposes.

Bits	Identifier	Access	Reset	Name
31:0	scratch	rw	0x0	—

scratch field

Scratch register

cl_clint_set register

• Absolute Address: 0x1A0
• Base Offset: 0x1A0
• Size: 0x8

Set bits in the cluster-local CLINT. Writing a 1 at location i sets the cluster-local interrupt of hart i, where i is relative to the first hart in the cluster, ignoring the cluster base hart ID.

Bits	Identifier	Access	Reset	Name
31:0	cl_clint_set	w	—	—

cl_clint_set field

Set cluster-local interrupt of hart i

cl_clint_clear register

• Absolute Address: 0x1A8
• Base Offset: 0x1A8
• Size: 0x8

Clear bits in the cluster-local CLINT. Writing a 1 at location i clears the cluster-local interrupt of hart i, where i is relative to the first hart in the cluster, ignoring the cluster base hart ID.

Bits	Identifier	Access	Reset	Name
31:0	cl_clint_clear	w	—	—

cl_clint_clear field

Set cluster-local interrupt of hart i

icache_prefetch_enable register

• Absolute Address: 0x1B0
• Base Offset: 0x1B0
• Size: 0x8

Controls prefetching of the instruction cache.

Bits	Identifier	Access	Reset	Name
0	icache_prefetch_enable	w	0x1	—

icache_prefetch_enable field

Enable instruction prefetching.

unused register

• Absolute Address: 0x1B8
• Base Offset: 0x1B8
• Size: 0x8

Unused register added to print enum

Bits	Identifier	Access	Reset	Name
4:0	f	r	0x0	—