delayfunc.asm

来自「ADSP与NANDFLASH的连接」· 汇编 代码 · 共 37 行

.global CLE_delay_func;
.global ALE_delay_func;
.global AFTER_RD_WR_delay_func;
.global Delay_Before_Return_func;

.section/pm seg_pmco;
//===========================================================================
//DELAY FUCNTIONS
//===========================================================================
	
CLE_delay_func:
	lcntr = 100, do CLE_delay until lce;
	CLE_delay:  nop;
	RTS;
	
CLE_delay_func.end:

ALE_delay_func:	
	lcntr = 800, do ALE_delay until lce;
	ALE_delay: nop;
	RTS;
ALE_delay_func.end:
	
//This delay is used after READ/WRITE operations are performed	
AFTER_RD_WR_delay_func:
	lcntr = 0xffff, do AFTER_RD_WR_delay until lce;
	AFTER_RD_WR_delay: nop;
	RTS;
AFTER_RD_WR_delay_func.end:
//This delay is used before returning from a function call
Delay_Before_Return_func:
	lcntr = 0x1fff, do Delay_Before_Return until lce;
	Delay_Before_Return: nop;
	RTS;Delay_Before_Return_func.end:
	
//==============End Of Delay Routines========================================