Detecting the second R/B,CE in monoliths

[kikiki]

Hi, Can you explain how to detect the second R/B and CE pins in monoliths?

Thanks.

[jeremyb]

RB isn't needed. The reader can either wait a long period of time or issue a 0x70 status command. RB can be tricky to find due to noise BUT look for RB to go LOW/HIGH after a 30h command and once data starts being read it goes high, match it up to whatever CE is LOW. If there are multiple buses this can be tricky, look for a sharp trigger (ie: no delay) on read or trial and error.

CE: During the boot sequence, CE's will usually look like a cascade..

eg:

Code:

CE0 -> ID (90h)
                CE1 -> ID (90h)
                               CE2 -> ID (90h)
                                              CE3 -> ID (90h)