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icache: Reduce simulation warnings

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This might slightly increase the logic in synthesis but avoids
us looking at uninitialized tags when not servicing an active
request

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2019-10-10 00:40:11 +11:00
parent a38ae503ff
commit 7b3df7cb05
1 changed files with 11 additions and 5 deletions
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16
icache.vhdl
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@ -274,6 +274,7 @@ begin
-- Generate a cache RAM for each way
rams: for i in 0 to NUM_WAYS-1 generate
signal do_read : std_ulogic;
signal do_write : std_ulogic;
signal rd_addr : std_ulogic_vector(ROW_BITS-1 downto 0);
signal wr_addr : std_ulogic_vector(ROW_BITS-1 downto 0);
@ -286,7 +287,7 @@ begin
)
port map (
clk => clk,
rd_en => '1', -- fixme
rd_en => do_read,
rd_addr => rd_addr,
rd_data => dout,
wr_en => do_write,
@ -296,6 +297,7 @@ begin
);
process(all)
begin
do_read <= '1';
do_write <= '0';
if wishbone_in.ack = '1' and r.store_way = i then
do_write <= '1';
@ -356,10 +358,11 @@ begin
hit_way := 0;
is_hit := '0';
for i in way_t loop
if read_tag(i, cache_tags(req_index)) = req_tag and
cache_valids(req_index)(i) = '1' then
hit_way := i;
is_hit := '1';
if i_in.req = '1' and cache_valids(req_index)(i) = '1' then
if read_tag(i, cache_tags(req_index)) = req_tag then
hit_way := i;
is_hit := '1';
end if;
end if;
end loop;
@ -434,6 +437,9 @@ begin
r.wb.dat <= (others => '0');
r.wb.sel <= "11111111";
r.wb.we <= '0';
-- Not useful normally but helps avoiding tons of sim warnings
r.wb.adr <= (others => '0');
else
-- Main state machine
case r.state is