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picorv32
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Clarify use of ENABLE_PCPI. 

* ENABLE_PCPI is only needed for external co-processors.
* Correct spelling of demonstration.
This commit is contained in:
Will Green 2024-03-06 17:50:12 +00:00
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commit 92c1360181
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@ -237,7 +237,9 @@ triggering an interrupt.
#### ENABLE_PCPI (default = 0) #### ENABLE_PCPI (default = 0)
Set this to 1 to enable the Pico Co-Processor Interface (PCPI). Set this to 1 to enable the _external_ Pico Co-Processor Interface (PCPI).
The external interface is not required for the internal PCPI cores, such as
`picorv32_pcpi_mul`.
#### ENABLE_MUL (default = 0) #### ENABLE_MUL (default = 0)
@ -284,7 +286,7 @@ Support for the timer is always disabled when ENABLE_IRQ is set to 0.
#### ENABLE_TRACE (default = 0) #### ENABLE_TRACE (default = 0)
Produce an execution trace using the `trace_valid` and `trace_data` output ports. Produce an execution trace using the `trace_valid` and `trace_data` output ports.
For a demontration of this feature run `make test_vcd` to create a trace file For a demonstration of this feature run `make test_vcd` to create a trace file
and then run `python3 showtrace.py testbench.trace firmware/firmware.elf` to decode and then run `python3 showtrace.py testbench.trace firmware/firmware.elf` to decode
it. it.
@ -735,4 +737,3 @@ See `make area` in [scripts/vivado/](scripts/vivado/).
| PicoRV32 (small) | 761 | 48 | 442 | | PicoRV32 (small) | 761 | 48 | 442 |
| PicoRV32 (regular) | 917 | 48 | 583 | | PicoRV32 (regular) | 917 | 48 | 583 |
| PicoRV32 (large) | 2019 | 88 | 1085 | | PicoRV32 (large) | 2019 | 88 | 1085 |