Sorry if I double post, not sure if I press submit or preview by mistake…
Anyways,
HI, I’m new to the whole ARM thing and I just received my first development board. BUT this board has no external memory but it does have the pin to connect to some. So I’m building a memory board for it. My question is…
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I’m planning to add 2Mb of flash to it and have the option of later (soldering on another 2Mb) the question is, for the Chip Select Pin (CS) Do I have to tie them together or does each memory have to have a separate CS line? ie. The first flash is tied to CS0 and the second Flash is CS1 or can they both be CS0?
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I’m planning to upgrade the on board crystal to 25Mhz, is memory speed going to be an issue, I mean do I need to fine a 30ns or faster flash?
Thanks.
PS.
The ARM is a LPC2214.