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关于ISA(PC104)操作时序模拟。。。
我设计中需用CY7c68013的GPIF方式模拟ISA的操作时序,现我的接口只用到ADBus(16bit)、DABus(16bit)、SMEMR*、SMEMW*、SBHE*,而应答线只用到IOCHRDY(0即恒有效)。我的单字读/写波形描述如下:
GPIF Waveform 2: SingleRd Interval 0 1 2 3 4 5 6 Idle (7) AddrMode Same Val Same Val Same Val Same Val Same Val Same Val Same Val DataMode NO Data NO Data Activate Activate NO Data NO Data NO Data NextData SameData SameData SameData SameData SameData SameData SameData Int Trig No Int No Int No Int No Int No Int No Int No Int IF/Wait Wait 2 Wait 9 Wait 3 Wait 1 Wait 2 Wait 2 Wait 2 Term A LFunc Term B Branch1 Branch0 Re-Exec Sngl/CRC Default Default Default Default Default Default Default MEMRD# 1 0 0 1 1 1 1 1 MEMWR# 1 1 1 1 1 1 1 1 IORD# 1 1 1 1 1 1 1 1 IOWR# 1 1 1 1 1 1 1 1 AEN 0 0 0 0 0 0 0 0 unused 1 1 1 1 1 1 1 1 GPIF Waveform 3: SingleWr Interval 0 1 2 3 4 5 6 Idle (7) AddrMode Same Val Same Val Same Val Same Val Same Val Same Val Same Val DataMode Activate Activate Activate Activate NO Data NO Data NO Data NextData SameData SameData SameData SameData SameData SameData SameData Int Trig No Int No Int No Int No Int No Int No Int No Int IF/Wait Wait 2 Wait 8 Wait 4 Wait 2 Wait 2 Wait 2 Wait 2 Term A LFunc Term B Branch1 Branch0 Re-Exec Sngl/CRC Default Default Default Default Default Default Default MEMRD# 1 1 1 1 1 1 1 1 MEMWR# 1 0 0 1 1 1 1 1 IORD# 1 1 1 1 1 1 1 1 IOWR# 1 1 1 1 1 1 1 1 AEN 0 0 0 0 0 0 0 0 unused 1 1 1 1 1 1 1 1 这个描述是参照一份ISA规范作的。但总是不能得到希望的结果。望指点!谢谢! |
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沙发#
发布于:2003-06-04 15:35
熟悉ISA时序的大虾们帮帮忙!给个指点嘛。拜托了,。。。
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