Quatech MPA-200 Manuale Utente Scaricare il pdf (Pagina 26)

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

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Quatech MPA-200 Manuale Utente Pagina 26