Register file with decoder macro-generator
#include <genlib.h>
void GENLIB_MACRO (DPGEN_RF1D, char *modelname, long flags, long N);
void GENLIB_MACRO (DPGEN_RF1DR0, char *modelname, long flags, long N);
Generate a register file of regNumber words of N bits with decoder named modelname. The DPGEN_RF1DR0 variant differs from the DPGEN_RF1D in that the register of address zero is stuck to zero. You can write into it, it will not change the value. When read, it will always return zero.
How it works :
•
datain0 and datain1 : the two write busses. Only one is used to actually write the register word, it is selected by the sel signal.
•
sel : when set to '0' the datain0 is used to write the register word, otherwise it will be datain1.
•
adr, adw : the width (Y) of those signals is computed from regNumber : Y = log2(regNumber).
•
wen and ren : write enable and read enable, allows reading and writing when sets to '1'.
1.
ck : clock signal (input, 1 bit).
2.
sel : select the write bus (input, 1 bit).
3.
wen : write enable (input, 1 bit).
4.
ren : read enable (input, 1 bit).
5.
adr : the read address (input, Y bits).
6.
adw : the write address (input, Y bits).
7.
datain0 : first write bus (input, N bits).
8.
datain1 : second write bus (input, N bits).
9.
dataout : read bus (output, N bits).
10.
vdd : power.
11.
vss : ground.
GENLIB_MACRO(DPGEN_RF1D, "model_rf1dx8_32"
, F_BEHAV|F_PLACE
, 32 /* Words size. */
, 8 /* Number of words. */
);
GENLIB_LOINS( "model_rf1dx8_32"
, "instance1_rf1d_32"
, "ck"
, "sel"
, "wen"
, "ren"
, "adr[2:0]"
, "adw[2:0]"
, "datain0[31:0]"
, "datain1[31:0]"
, "dataout[31:0]"
, "vdd", "vss", NULL
);