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SRAM.PDS
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1995-02-18
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2KB
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70 lines
; This example demonstrates different
; ways to use the SRAMs in the EPX780.
;
; SET COMPILER OPTIONS TO:
; Use Design Pin Assignments, but not
; Previous, Abort on no fit
CHIP product NFX780_84
PIN 3 CLK1 ; synchronous clock pin 1
PIN 45 CLK2 ; synchronous clock pin 2
PIN a[0:6] ; address pins
PIN d[9:0] ; data pins
PIN we_ ; write enable
PIN oe_ ; output enable
PIN be_ ; block enable
PIN rama[3:0] RAM ; a 128x4 SRAM
PIN ramb[9:0] RAM REG ; a 128x10 SRAM
; with registered outputs
; initialize all locations in SRAM
; rama with 0x4 and then load the first
; location with 0x3 and the next fifteen
; locations with 0x7
RAM_DEFAULTS rama DEFAULT_VALUE 0x4
0x00 : 0x3
[0x01:0x0F] : 0x7
; initialize all locations in SRAM
; ramb with 0x3FF and then load the first
; sixteen locations with zero
RAM_DEFAULTS ramb DEFAULT_VALUE 0x3FF
[0x00:0x1F] : 0x0
EQUATIONS
; use only the first 32 locations of rama
rama[4:0].ADDR = a[4:0]
; connect only four data inputs to rama
rama[3:0].DATA = d[3:0]
; always enable rama
/rama.BE = GND;
; make rama into a read-only memory
rama.WE = GND
; always enable memory output from rama
rama.TRST = VCC
; use all the locations
ramb[6:0].ADDR = a[6:0]
; use all the data inputs
ramb[9:0].DATA = d[9:0]
; connect write, block, and output enables
/ramb.WE = we_
/ramb.BE = be_
/ramb.TRST = oe_
; clock ram outputs into register on the
; rising edge of CLK1
ramb.CLKF = CLK1
SIMULATION
VECTOR address := [a6,a5,a4,a3,a2,a1,a0]
SETF we_ /be_ /oe_ /CLK1
FOR i:=0 TO 40 DO
BEGIN
SETF address := i
CLOCKF CLK1
END