github.com/mist-devel.mist-board
1
0
Fork 0
mirror of https://github.com/mist-devel/mist-board.git synced 2026-02-05 15:44:40 +00:00
Code Issues Releases Wiki Activity

C16: [T65] fix SO signal samping

Browse Source
This commit is contained in:
Gyorgy Szombathelyi
2018-09-03 03:26:18 +02:00
parent 5b7de4ea7c
commit 5667e081a0
1 changed files with 7 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
cores/c16/t65/T65.vhd
View File

@@ -463,9 +463,6 @@ begin
--This should happen after P has been pushed to stack
tmpP(Flag_I) := '1';
end if;
if SO_n_o = '1' and SO_n = '0' then
tmpP(Flag_V) := '1';
end if;
if RstCycle = '1' then
tmpP(Flag_I) := '1';
tmpP(Flag_D) := '0';
@@ -474,7 +471,6 @@ begin
P<=tmpP;--new way
SO_n_o <= SO_n;
if IR(4 downto 0)/="10000" or Jump/="01" then -- delay interrupts during branches (checked with Lorenz test and real 6510), not best way yet, though - but works...
IRQ_n_o <= IRQ_n;
end if;
@@ -484,6 +480,13 @@ begin
NMI_n_o <= NMI_n;
end if;
end if;
-- act immediately on SO pin change
-- The signal is sampled on the trailing edge of phi1 and must be externally synchronized (from datasheet)
SO_n_o <= SO_n;
if SO_n_o = '1' and SO_n = '0' then
P(Flag_V) <= '1';
end if;
end if;
end process;