datasample.tdf

这是用AHDL语言编写的一个PCI采集系统的逻辑源码

SUBDESIGN datasample
(
--signals from data sample circuit
	sh					:	INPUT;  -- line CCD frame sync
	data_in[7..0]		:	INPUT;  -- CA3318 data output(ID[7..0])
	sm_clk				:	INPUT;  -- CA3318 SAMPLE CLK
	src_clk				:	INPUT;  -- SOURCE CLK,TO PRODUCE TIMING SIGNALS ,10M
--signals to pingpang unit
	data_out[7..0]		:	OUTPUT;
	ram_wr_addr[14..0]	:	OUTPUT;
	dfv,ndfv,sync,pclk	:	OUTPUT;  --ODD AND EVEN  INDICATOR

)

VARIABLE
 	o_e,pclk			:	DFF;
	data[7..0]			:	DFF;
	ram_wr_addr[14..0]	: 	DFF;
	

BEGIN
--produce wr ouput
	sync = sh;
	pclk.clk = !src_clk;
	pclk = sm_clk;

--produce data output
	data[].clk = pclk;
	data[] = data_in[];
	data_out[] = data[];

--produce addr output
	ram_wr_addr[].clk = PCLK;	
	ram_wr_addr[] = ram_wr_addr[] + 1;
	ram_wr_addr[].clrn = !sh;
	--ram_wr_addr[] = ram_addr;

--PRODUCE ODD AND EVEN SIGNALS
	o_e.clk = sh;
	o_e = !o_e;
	dfv = o_e;
	ndfv = !o_e;

END;