PC-card - 64K border

From: Ruud Baltissen (Ruud.Baltissen_at_abp.nl)
Date: 2001-04-19 14:08:17


I forgot to implement one feature: copying/DMA-ing over the 64K border. I
found a quick but maybe dirty solution. The original idea was using a 573
for A16..23. Instead one I'll use two. The idea is activating one 573 when
MEMW = (L), the other when MEMW = (L). Quite simple.

The "dirty" part is that I'm not familiar enough with any complex card or IC
to know if I can expect trouble in some or another way (like IC's needing
some setup time). The only idea I have for the moment is to delay these two
signals and to OR these with the inverted CLK2. The result is fed to the
appropiate lines.

Any comment is welcome.

Groetjes, Ruud


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