[VME] Rework of VME bus master (DRAFT)
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Use sn74vmeh22501 for VME data drivers (replace IC17, IC25). According to VITA-1 rule 6.15, Iol must be greater than 48mA, but Iol = 24mA for the current sn74lvch16t245. I fear the current driver might be too slow.
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BERR needs only to be driven low, so no need for berr_out. (free one pin).
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Cannot use A_OE_N and A_DIR for AM[5..0] drivers. According to VITA-1 rule 2.42, AM must be valid during all data transfer cycles. However, we can share OE and DIR with AS, IACK and WRITE (and probably use the same driver bank).
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BGOUT[0..2] needs to be driven high when the board is in slot 1. Maybe add a controlled pull-up.
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BBSY needs to be read and driven.
Edited by Tristan Gingold