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Figure 3 Block diagram of DMA on MPA-200.
W/REQA
DTR/REQA
W/REQB
SCC
DMATRQ
DRMRRQ
J10
J11
PAL
7.1 Using Terminal Count to Generate an Interrupt
The MPA-200 allows the option of generating an interrupt whenever the Terminal
Count (TC) signal is asserted. Terminal Count is an indicator generated by the
system’s DMA controller, which signals that the number of transfers programed
into the DMA controller’s transfer register have occurred. This board feature only
works when theinterrupt sharing feature is selected on jumper J4.
Quatech Inc., MPA-200/300 Manual 20