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[/] [qaz_libs/] [trunk/] [basal/] [src/] [FIFOs/] [CummingsSNUG2002SJ_FIFO1/] [beh_fifo.v] - Rev 34

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// --------------------------------------------------------------------
//
 
 
module beh_fifo (rdata, wfull, rempty, wdata,
winc, wclk, wrst_n, rinc, rclk, rrst_n);
parameter DSIZE = 8;
parameter ASIZE = 4;
output [DSIZE-1:0] rdata;
output wfull;
output rempty;
input [DSIZE-1:0] wdata;
input winc, wclk, wrst_n;
input rinc, rclk, rrst_n;
reg [ASIZE:0] wptr, wrptr1, wrptr2, wrptr3;
reg [ASIZE:0] rptr, rwptr1, rwptr2, rwptr3;
parameter MEMDEPTH = 1<<ASIZE;
reg [DSIZE-1:0] ex_mem [0:MEMDEPTH-1];
always @(posedge wclk or negedge wrst_n)
if (!wrst_n) wptr <= 0;
else if (winc && !wfull) begin
ex_mem[wptr[ASIZE-1:0]] <= wdata;
wptr <= wptr+1;
end
always @(posedge wclk or negedge wrst_n)
if (!wrst_n) {wrptr3,wrptr2,wrptr1} <= 0;
else {wrptr3,wrptr2,wrptr1} <= {wrptr2,wrptr1,rptr};
always @(posedge rclk or negedge rrst_n)
if (!rrst_n) rptr <= 0;
else if (rinc && !rempty) rptr <= rptr+1;
always @(posedge rclk or negedge rrst_n)
if (!rrst_n) {rwptr3,rwptr2,rwptr1} <= 0;
else {rwptr3,rwptr2,rwptr1} <= {rwptr2,rwptr1,wptr};
assign rdata = ex_mem[rptr[ASIZE-1:0]];
assign rempty = (rptr == rwptr3);
assign wfull = ((wptr[ASIZE-1:0] == wrptr3[ASIZE-1:0]) &&
(wptr[ASIZE] != wrptr3[ASIZE] ));
endmodule
 

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