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[rtl/icache] Fix an inconsistency in data output

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- valid_o could be asserted for one cycle then dropped when receiving
  rvalid data for a request which has branched into  the middle of a
  line.
- This fix keeps valid_o asserted by using the offset version of
  fill_rvd_cnt_q (fill_rvd_beat) to compare against fill_out_cnt_q
  (which is also offset by the branch).

Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>
This commit is contained in:
Tom Roberts 2020-03-23 14:45:27 +00:00 • committed by Tom Roberts
parent f8f8560563
commit 3c561e4106
1 changed files with 1 additions and 1 deletions
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2
rtl/ibex_icache.sv
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@ -604,7 +604,7 @@ module ibex_icache #(
// - Data is available from the bus this cycle (fill_rvd_arb)
assign fill_out_req[fb] = fill_busy_q[fb] & ~fill_stale_q[fb] & ~fill_out_done[fb] &
(fill_hit_ic1[fb] | fill_hit_q[fb] |
(fill_rvd_cnt_q[fb] > fill_out_cnt_q[fb]) | fill_rvd_arb[fb]);
(fill_rvd_beat[fb] > fill_out_cnt_q[fb]) | fill_rvd_arb[fb]);
// Calculate when a beat of data is output. Any ECC error squashes the output that cycle.
assign fill_out_grant[fb] = fill_out_arb[fb] & output_ready & ~ecc_err_ic1;