Work in progress. Added PS/2 keyboard interface, hardware debugger. Interrupt test output to 6522 (remove later). Fixed error in pin assignments that blocked access to Flash chip select. Added reading sideways ROMs from external Flash (all but BASIC masked off for now).

1 files changed, 23 insertions, 2 deletions

diff --git a/m6522_tb.vhd b/m6522_tb.vhd
index 7c4b1fa..eb76db5 100644
--- a/m6522_tb.vhd
+++ b/m6522_tb.vhd
@@ -46,7 +46,8 @@ component M6522 is
     I_P2_H            : in    std_logic; -- high for phase 2 clock  ____----__

     RESET_L           : in    std_logic;

     ENA_4             : in    std_logic; -- clk enable

-    CLK               : in    std_logic

+    CLK               : in    std_logic;

+    testout		: out std_logic_vector(7 downto 0)

     );

 end component;

 

@@ -80,6 +81,8 @@ signal n_reset	:	std_logic := '0';
 signal clken	:	std_logic := '0';

 signal clock	:	std_logic := '0';

 

+signal testout : std_logic_vector(7 downto 0);

+

 begin

 

 	uut: m6522 port map (

@@ -90,7 +93,7 @@ begin
 		cb1_in, cb1_out, n_cb1_oe,

 		cb2_in, cb2_out, n_cb2_oe,

 		pb_in, pb_out, n_pb_oe,

-		phase2, n_reset, clken, clock

+		phase2, n_reset, clken, clock, testout

 		);

 		

 	clock <= not clock after 125 ns; -- 4x 1 MHz

@@ -317,6 +320,24 @@ begin
 		wait for 50 us;

 		reg_read("1000"); -- Should clear interrupt

 		

+		-- Timer 2 test similar to BBC usage (speech interrupt)

+		-- PB6 high

+		pb_in(6) <= '1';

+		reg_write("1101","01111111"); -- Clear interrupts

+		reg_write("1110","01111111"); -- Disable all interrupts

+		reg_write("1011","00100000"); -- Timer 2 PB6 counter mode

+		reg_write("1000","00000001"); -- Start at 1

+		reg_write("1001","00000000");

+		reg_write("1110","10100000"); -- Enable timer 2 interrupt

+		wait for 5 us;

+		-- Generate falling edge

+		pb_in(6) <= '0';

+		wait for 5 us;

+		-- Clear interrupt

+		reg_write("1101","00100000");

+		-- Zero timer high byte

+		reg_write("1001","00000000");

+		

 		wait;

 	end process;