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Refactor readback mux implementation. Improves performance (#155) and eliminates illegal streaming operator usage (#165)

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This commit is contained in:
Alex Mykyta
2025-12-10 23:17:33 -08:00
parent 4201ce975e
commit 9fc95b8769
24 changed files with 1116 additions and 634 deletions
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9
docs/architecture.rst
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@@ -38,18 +38,15 @@ This section also assigns any hardware interface outputs.
Readback
--------
The readback layer aggregates and reduces all readable registers into a single
read response. During a read operation, the same address decode strobes are used
to select the active register that is being accessed.
This allows for a simple OR-reduction operation to be used to compute the read
data response.
The readback layer aggregates and MUXes all readable registers into a single
read response.
For designs with a large number of software-readable registers, an optional
fanin re-timing stage can be enabled. This stage is automatically inserted at a
balanced point in the read-data reduction so that fanin and logic-levels are
optimally reduced.
.. figure:: diagrams/readback.png
.. figure:: diagrams/rt-readback-fanin.png
:width: 65%
:align: center

10
docs/dev_notes/Alpha-Beta Versioning
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@@ -1,10 +0,0 @@
Holy smokes this is complicated
Keep this exporter in Alpha/Beta for a while
Add some text in the readme or somewhere:
- No guarantees of correctness! This is always true with open source software,
but even more here!
Be sure to do your own validation before using this in production.
- Alpha means the implementation may change drastically!
Unlike official sem-ver, I am not making any guarantees on compatibility
- I need your help! Validating, finding edge cases, etc...

115
docs/dev_notes/template-layers/5-readback-mux
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@@ -1,35 +1,84 @@
--------------------------------------------------------------------------------
Readback mux layer
--------------------------------------------------------------------------------
Use a large always_comb block + many if statements that select the read data
based on the cpuif address.
Loops are handled the same way as address decode.
Implementation:
- Big always_comb block
- Initialize default rd_data value
- Lotsa if statements that operate on reg strb to assign rd_data
- Merges all fields together into reg
- pulls value from storage element struct, or input struct
- Provision for optional flop stage?
Other options that were considered:
- Flat case statement
con: Difficult to represent arrays. Essentially requires unrolling
con: complicates retiming strategies
con: Representing a range (required for externals) is cumbersome. Possible with stacked casez wildcards.
- AND field data with strobe, then massive OR reduce
This was the strategy prior to v1.3, but turned out to infer more overhead
than originally anticipated
- Assigning data to a flat register array, then directly indexing via address
con: Would work fine, but scales poorly for sparse regblocks.
Namely, simulators would likely allocate memory for the entire array
- Assign to a flat array that is packed sequentially, then directly indexing using a derived packed index
Concern that for sparse regfiles, the translation of addr --> packed index
becomes a nontrivial logic function
Mux Strategy:
Flat case statement:
-- Cant parameterize
+ better performance?
Pros:
- Scales well for arrays since loops can be used
- Externals work well, as address ranges can be compared
- Synthesis results show more efficient logic inference
Flat 1-hot array then OR reduce:
- Create a bus-wide flat array
eg: 32-bits x N readable registers
- Assign each element:
the readback value of each register
... masked by the register's access strobe
- I could also stuff an extra bit into the array that denotes the read is valid
A missed read will OR reduce down to a 0
- Finally, OR reduce all the elements in the array down to a flat 32-bit bus
- Retiming the large OR fanin can be done by chopping up the array into stages
for 2 stages, sqrt(N) gives each stage's fanin size. Round to favor
more fanin on 2nd stage
3 stages uses cube-root. etc...
- This has the benefit of re-using the address decode logic.
synth can choose to replicate logic if fanout is bad
Example:
logic [7:0] out;
always_comb begin
out = '0;
for(int i=0; i<64; i++) begin
if(i == addr) out = data[i];
end
end
How to implement retiming:
Ideally this would partition the design into several equal sub-regions, but
with loop structures, this is pretty difficult..
What if instead, it is partitioned into equal address ranges?
First stage compares the lower-half of the address bits.
Values are assigned to the appropriate output "bin"
logic [7:0] out[8];
always_comb begin
for(int i=0; i<8; i++) out[i] = '0;
for(int i=0; i<64; i++) begin
automatic bit [5:0] this_addr = i;
if(this_addr[2:0] == addr[2:0]) out[this_addr[5:3]] = data[i];
end
end
(not showing retiming ff for `out` and `addr`)
The second stage muxes down the resulting bins using the high address bits.
If the user up-sizes the address bits, need to check the upper bits to prevent aliasing
Assuming min address bit range is [5:0], but it was padded up to [8:0], do the following:
logic [7:0] rd_data;
always_comb begin
if(addr[8:6] != '0) begin
// Invalid read range
rd_data = '0;
end else begin
rd_data = out[addr[5:3]];
end
end
Retiming with external blocks
One minor downside is the above scheme does not work well for external blocks
that span a range of addresses. Depending on the range, it may span multiple
retiming bins which complicates how this would be assigned cleanly.
This would be complicated even further with arrays of externals since the
span of bins could change depending on the iteration.
Since externals can already be retimed, and large fanin of external blocks
is likely less of a concern, implement these as a separate readback mux on
the side that does not get retimed at all.
WARNING:
@@ -42,8 +91,14 @@ WARNING:
Forwards response strobe back up to cpu interface layer
TODO:
Dont forget about alias registers here
TODO:
Does the endinness the user sets matter anywhere?
Variables:
From decode:
decoded_addr
decoded_req
decoded_req_is_wr
Response:
readback_done
readback_err
readback_data

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