| commit | da4934f66af80ce1fc85e4c3359af37a5e7183a8 | [log] [tgz] |
|---|---|---|
| author | Rupert Swarbrick <rswarbrick@lowrisc.org> | Thu May 13 15:33:48 2021 +0100 |
| committer | Srikrishna Iyer <46467186+sriyerg@users.noreply.github.com> | Thu May 13 12:14:44 2021 -0700 |
| tree | ec45be5af0047eb300eed8a771e764185474aebe | |
| parent | 6be21b3810009048b53740e6069a6f047a16f4ab [diff] |
[rom_ctrl] Fix gnt/rvalid timing just after initial check finishes The rom_ctrl block is supposed to give access just to the checker until the checker is finished, at which point the bus can start accessing data. To control this, there is a mux with a sel_i signal. When sel_i is 1, the checker is still running. When it drops to zero (a one-time event), the bus should have access. Before this patch, there was a bug where the block would seemingly respond to a request in zero time, raising the bus grant signal and rvalid at the same time. The problem was just that we were incorrectly using a registered signal for the grant: the ROM had taken the request a cycle earlier but we didn't tell the bus. Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
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