复件 ram_inst.psm

xilinx ISE 实例代码。可用ISE直接打开

;NAMEREG sX, <name>     ; Rename register sX with <name>
CONSTANT VGA_ADDR_R, 10 ; Define constant <name>, assign value
CONSTANT VGA_ADDR_G, 11 ;
CONSTANT VGA_ADDR_B, 12 ;

CONSTANT PUSHBUTTON_ADDR,20;

CONSTANT SEGLED_ADDR_LED,00;
CONSTANT SEGLED_ADDR_SEGUP,01;
CONSTANT SEGLED_ADDR_SEGLOW,02;
CONSTANT SEGLED_ADDR_SEGDOT,03;

; ROM output file is always called
; <filename>.vhd


ADDRESS 000      ; Programs always start at reset vector 0
ENABLE INTERRUPT ; If using interrupts, be sure to enable
                 ; the INTERRUPT input
BEGIN:
                 ; <<< your code here >>>
LOAD S0, FF;
LOAD S1, FF;
LOAD S2, FF;
LOAD S3, FF;

OUTPUT S0,SEGLED_ADDR_LED;
OUTPUT S1,SEGLED_ADDR_SEGUP;
OUTPUT S2,SEGLED_ADDR_SEGLOW;
OUTPUT S3,SEGLED_ADDR_SEGDOT;

loop:
JUMP loop;

JUMP BEGIN ; Embedded applications never end


ISR:           ; An Interrupt Service Routine (ISR) is
               ; required if using interrupts
               ; Interrupts are automatically disabled
               ; when an interrupt is recognized
               ; Never re-enable interrupts during the ISR
INPUT S0, PUSHBUTTON_ADDR ; Read the ISR register from Push Button module
LOAD S1, S0 ;
AND S1,07   ; mask out the 3 bit of LSB ( B,G,R )

R:
RR S1       ; The LSB is in the carry => R field
JUMP NC, G       ;
INPUT S2, VGA_ADDR_R;
ADD S2 , 01 ;
OUTPUT S2,VGA_ADDR_R;
G:
RR S1       ; The Less LSB is in the carry => G field
JUMP NC, B       ;
INPUT S2, VGA_ADDR_G;
ADD S2 , 01 ;
OUTPUT S2,VGA_ADDR_G;
B:
RR S1       ; The 3rd LSB is in the carry => B field
JUMP NC, INTEND  ;
INPUT S2, VGA_ADDR_B;
ADD S2 , 01 ;
OUTPUT S2,VGA_ADDR_B;

INTEND:
LOAD S3, 00
OUTPUT S3, PUSHBUTTON_ADDR;

RETURNI ENABLE ; Return from interrupt service routine
               ; Use RETURNI DISABLE to leave interrupts
               ; disabled
ADDRESS 3FF    ; Interrupt vector is located at highest
               ; instruction address
JUMP ISR       ; Jump to interrupt service routine, ISR