Motorola MVME172 - Manual (Page 138)

2-60 Computer Group Literature Center Web Site
VMEchip2
2
3 The DMAC executes D64 block transfer
cycles on the VMEbus. In the block transfer
mode, the DMAC may execute byte, two-
byte and four-byte cycles at the beginning
and ending of a transfer in non-block transfer
mode. If the D16 bit is set, the DMAC
executes D16 block transfers.
DMAC Local Bus Address Counter
In the direct mode, this counter is programmed with the starting address of
the data in local bus memory.
DMAC VMEbus Address Counter
In the direct mode, this counter is programmed with the starting address of
the data in VMEbus memory.
ADR/SIZ $FFF40038 (32 bits)
BIT 31 . . . 0
NAME DMAC Local Bus Address Counter
OPER R/W
RESET 0 PS
ADR/SIZ $FFF4003C (32 bits)
BIT 31 . . . 0
NAME DMAC VMEbus Address Counter
OPER R/W
RESET 0 PS