dsss.tdf

《FPGA嵌入式应用系统开发典型实例》-书的光盘资料

--本程序实现扩频数据的产生;
INCLUDE "LPM_ROM.INC";
SUBDESIGN	dsss
(
	HIGHCLK:			INPUT;			--8倍码片时钟;
	PN:				OUTPUT;
	IDATA:			OUTPUT;
	QDATA:			OUTPUT;
	IDS:				OUTPUT;
	QDS:				OUTPUT;
	CHIPCLK1X:		OUTPUT;
	CHIPCLK2X:		OUTPUT;
	CHIPCLK4X:		OUTPUT;
	DATACLK:			OUTPUT;
	RRCADD[2..0]:	OUTPUT;
)
VARIABLE
	COUNTER[9..0]:	DFF;
	ADD_DATA[4..0]:	DFF;
	ADD_PN[6..0]:	DFF;
	DATA[1..0]:		NODE;
	PNCODE:			NODE;
BEGIN
	COUNTER[].CLK = HIGHCLK;
	COUNTER[].D = COUNTER[].Q + 1;
	CHIPCLK4X = COUNTER[0].Q;
	CHIPCLK2X = COUNTER[1].Q;
	CHIPCLK1X = COUNTER[2].Q;
	DATACLK = COUNTER[9].Q;
	ADD_DATA[].CLK = COUNTER[9].Q;
	IF ADD_DATA[].Q == 30 THEN
		ADD_DATA[].D = 0;
	ELSE
		ADD_DATA[].D = ADD_DATA[].Q + 1;
	END IF;
	ADD_PN[].CLK = COUNTER[2].Q;
	ADD_PN[].D = ADD_PN[].Q + 1;
DATA[] = LPM_ROM(.INCLOCK = !COUNTER[9].Q, .OUTCLOCK = !COUNTER[9].Q, 
.ADDRESS[] = ADD_DATA[].Q)
WITH(LPM_WIDTH = 2, LPM_WIDTHAD = 5, LPM_NUMWORDS = 31, LPM_FILE = "TDMPN.MIF")	RETURNS(.Q[]);
	IDATA = DATA[1];
	QDATA = DATA[0];
PNCODE = LPM_ROM(.INCLOCK = !COUNTER[2].Q, .OUTCLOCK = !COUNTER[2].Q, 
.ADDRESS[] = ADD_PN[].Q)
	WITH(LPM_WIDTH = 1, LPM_WIDTHAD = 7, LPM_FILE = "PNG.MIF")
	RETURNS(.Q[]);
	PN = PNCODE;
	IDS = DATA[1] XNOR PNCODE;
	QDS = DATA[0] XNOR PNCODE;
	RRCADD[2] = NOT COUNTER[2].Q;
	RRCADD[1] = NOT (COUNTER[2].Q XOR COUNTER[1].Q);
	RRCADD[0] = NOT (COUNTER[2].Q XOR COUNTER[0].Q);
END;