Quatech MPA-200/300, RS-422/485 user manual Reqa

Figure 3 Block diagram of DMA on MPA-200.

W/REQA		J10
DTR/REQA	DMATRQ
	DRMRRQ
W/REQB	PAL	J11
SCC

7.1Using 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