Specifications

DMA Controller (V40)
ZT 8832 SPECIFICS
The ZT 8832 uses one of the four DMA controllers contained in the
V40. DMA channel 0 is used to coordinate high speed data transfers
between the SBX expansion module I/O and local or dual port
memory. The SBX expansion module must support DMA by driving
Expansion Module DMA Request (MDRQT) on J4 pin 34 and
receiving Expansion Module DMA Acknowledge (MDAK) on J4
pin 32. The DMA interface does not support Terminate DMA
(TDMA) on J4 pin 26.
To meet SBX expansion module timings, the WCY2 V40 con-
figuration register must be must be programmed to insert two wait
states into DMA cycles. See page 6-7 for details.
9-3