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77 Commits

Author SHA1 Message Date
David Anderson b46d70fa07 vram/VRAMCore: cycle using prime numbers in tests 
VRAMs are powers of two, so if memory wiring is wrong and we end up
with ram blocks mirrored at several points in the address space, we
want a write pattern that doesn't repeat cleanly on power of two
blocks. That way, a mirrored memory block cannot contain values that
are valid for all its locations.
 2024-09-09 11:27:53 -07:00
David Anderson 719339e69f vram/MemArbiter: plumb verbose test flag into test 2024-09-09 11:22:07 -07:00
David Anderson 80391cefee lib/DelayLine: plumb verbose test flag into tests 2024-09-09 11:20:13 -07:00
David Anderson 1ca4ccff99 tasks.py: plumb -v to enable verbose test output 2024-09-09 11:17:08 -07:00
David Anderson 4b6b34e131 vram/VRAMCore: add tests, fix bug found by same 2024-09-09 11:16:21 -07:00
David Anderson ffb9f7c062 lib/Testing: add helper module to access test flags 
Notably, this lets me plumb +v for verbose test output.
 2024-09-09 11:15:51 -07:00
David Anderson 23a78eee9e vram/VRAM: a little more documentation tweaking 2024-09-08 23:44:45 -07:00
David Anderson 16af267ab6 vram/VRAM: tweak docs, remove unnecessary rule condition 2024-09-08 23:42:27 -07:00
David Anderson 1929bbe3cc vram/VRAM: at last, a video RAM, with all the gubbins 2024-09-08 23:39:12 -07:00
David Anderson fb57903021 vram/VRAMCore: make simulatable in Bluesim, tidy up 2024-09-08 23:19:39 -07:00
David Anderson 79b54ca86f vram/MemArbiter: add a granted_port method to make downstream wiring easier 
To implement the mux tree that feeds into RAM ports, we need to know the
port index of the grantee to be able to wire it up. In theory we could
dispense with the per-port grant signal, but keeping it around allows
each client to deal with local concerns separate from the port routing.
 2024-09-08 23:16:49 -07:00
David Anderson 2ebf399d62 vram/MemArbiter: remove MemArbiterClient, not needed right now 2024-09-08 22:44:39 -07:00
David Anderson eca95e0fb6 vram/VRAMCore: correct exports of the vram types 2024-09-08 15:37:47 -07:00
David Anderson 913c407224 hardware/sentinel65x: comment out logic 
I'm not quite ready to define top-levels yet, and having this incomplete
code here makes 'inv build .' fail.
 2024-09-08 15:16:34 -07:00
David Anderson e5aabcbf4a vram/MemArbiter: remove unnecessary wires and fields 
While iterating many redundant bits were added. This removes them again,
keeping just (I think) the minimum necessary for the arbitrators to work.
 2024-09-08 15:13:47 -07:00
David Anderson 519eddc552 vram/MemArbiter: fix bug with write conflict avoidance 
Now that all arbiter ports can request to write, arbitration must check
both (write, read) and (read, write) conflicts, not just (write, read).
 2024-09-08 15:02:55 -07:00
David Anderson 191cd1bfa2 vram: document MemArbiter, fix round-robin ordering bug 2024-09-08 14:10:52 -07:00
David Anderson f31f64f5a2 vram: refactor MemArbiter into separate arbiters 
Rather than hardcode one architecture for GARY, the arbiters
are now split and can be allocated per-port. The arbiter interface
includes plumbing so that one arbiter can propagate a write conflict
to another, so it can still implement multi-port arbitration as long
as every client is statically allocated to one port.
 2024-09-08 13:26:25 -07:00
David Anderson 2760bad965 vram: move VRAM to VRAMCore, in prep for arbitrated VRAM 2024-09-08 09:28:28 -07:00
David Anderson 69b7ce7f9e vram: adjust the MemoryArbiterClient interface a little 2024-09-08 09:27:25 -07:00
David Anderson 81e5264d22 vram: make arbiter clients and servers connectable 2024-09-07 19:49:43 -07:00
David Anderson aa048537ef vram/MemArbiter: rewrite to use client/server idioms 
In preparation for making the two Connectable and defining an
arbitrated memory client/server for VRAM access.
 2024-09-07 16:58:11 -07:00
David Anderson b2b2c14009 vram/VRAM: finish the top-level VRAM module 
Well, for now at least. It can build 112KiB and 128KiB memories that
seem to synthesize to something reasonable.
 2024-09-07 16:04:21 -07:00
David Anderson dd551ce09b tasks.py: fix typo in synth process 2024-09-07 16:03:52 -07:00
David Anderson fc4b212139 compile all tests before running them, so the outputs are grouped 2024-09-07 12:15:33 -07:00
David Anderson 6e84e9c689 adjust 'inv genclk' to allow per-hardware PLLs 2024-09-07 12:11:27 -07:00
David Anderson 77b772c7ee tasks.py: improve handling of Bluespec libdirs 
To help divvy up the sources better, the build now makes a libpath
consisting of all directories that have bsv files in them, with a few
exceptions: hardware subdirs are target-specific so only get used if
they're the current build target. Experiments are random crap so get
the same treatment. And the 'sim' dir is only test helpers, so they
only get pulled in by tests.
 2024-09-07 10:31:32 -07:00
David Anderson 25d1806590 lib/ClockOut: hack module to export a clock as an ordinary signal 
Used to output a clock signal from an FPGA pin. The resultant output
signal is unclocked, so can be presented to any output at will.
 2024-09-07 10:06:50 -07:00
David Anderson 5e997201db hardware/sentinel65x: move top-level hw module to hw subdir 2024-09-07 10:04:36 -07:00
David Anderson 6fd040565c Grab the inout port fixer from bsc tree, wire it in 
Yosys doesn't understand Verilog-2001 port aliases. Unfortunately
bsc uses those to represent inout ports because it's the only way
to represent a particular kind of shared bus in Verilog source code.

Thankfully, a kind soul at Bluespec Inc made a perl script that
transforms the port alias construct into regular verilog-1995, which
works fine in cases like mine where the only user of the inout port
is a TriState module which tears it apart into separate
input/output/enable signals for the rest of bsc to work with.
 2024-09-06 21:26:39 -07:00
David Anderson 0005ad6fe5 sentinel65x/PLL: update PLL settings, fix generator 2024-09-06 21:18:00 -07:00
David Anderson d960eee973 flake.lock: update tools 2024-09-06 21:17:32 -07:00
David Anderson f61328dac4 experiments/primitive_ram: clean up old testing code 2024-09-06 16:23:49 -07:00
David Anderson 930f9f7078 sentinel65x: start of Sentinel 65X top-level glue, with a PLL module 
The PLL generates a 100MHz clock for GARY, 10MHz for the CPU and
system bus, and 25MHz for VGA out.
 2024-09-06 16:21:25 -07:00
David Anderson f7cb4b6ba2 vram/VRAM: early VRAM implementation 
Only checked up to mkByteRAMArray, main VRAM still WIP
 2024-09-06 16:11:55 -07:00
David Anderson 7560199251 tasks: support running nextpnr with a generic ulx3s pin map 
This is handy for quick experiments, rather than having to define a
bespoke pin map for each experiment.
 2024-09-06 16:11:03 -07:00
David Anderson 2953106ec7 lib/ECP5_RAM: mark interfaces always_ready 
Elides a couple of unnecessary signals from the design
 2024-09-06 16:10:22 -07:00
David Anderson ab20db44f4 vram: rename MemoryArbiter to something shorter 
As I implement the whole transaction-level modeling thing with
arbitration, the interface names are getting longer and longer.
 2024-09-06 10:04:20 -07:00
David Anderson 7f10694371 vram: get rid of old commented code 2024-09-06 00:13:42 -07:00
David Anderson f010693b9b vram: compact the test output even more 2024-09-06 00:08:14 -07:00
David Anderson 71f422b8c1 vram: fix up documentation for MemoryArbiterWriter 2024-09-06 00:02:23 -07:00
David Anderson e0d156cdd1 vram: a little more formatting of the vram test 
Make it a bit more compact, for large test runs
 2024-09-06 00:00:25 -07:00
David Anderson d41ca7daae vram: tidy up formatting 2024-09-05 23:51:21 -07:00
David Anderson 60348fefd2 vram: one more arbiter test for port conflicts 2024-09-05 23:46:01 -07:00
David Anderson 5e22d03e15 vram: implement a MemoryArbiter for VRAM 2024-09-05 23:39:21 -07:00
David Anderson 2cd172cc73 tasks.py: add sim directory when running tests 
So that bluesim can find the DP16KD simulation model.
 2024-08-31 00:00:59 -07:00
David Anderson efb5327f53 lib: clean up ECP5_RAM.v a bit 2024-08-31 00:00:41 -07:00
David Anderson 119eeceaef Add some early testing harness for the sim DP16KD 2024-08-30 22:14:10 -07:00
David Anderson a4a10becbf tasks.py: print one more intermediate output path 2024-08-30 20:06:36 -07:00
David Anderson a0892fefcd sim/tb: add "bad" signals to make it easier to see wrong outputs 2024-08-30 20:00:11 -07:00