Zilog Z16C30 Manuale Utente Scaricare il pdf (Pagina 124)

6-5

Z16C30 USC

USER'S MANUALZILOG

UM97USC0100

Figure 6-4. *Flyby DMA Transfer, Peripheral Device to Memory

DMAC

Memory Device

REQ

Address

Memory Location

/RD

Data

from Device

to Memory

/WR

If the device doesn't have (much) more data

if the device wants to provide more data

DMA Request

(e.g., /RxREQ)

DMA Acknowledge

(e.g., /RxACK)

ACK

data

Must be blocked

at USC

UM009402-0201

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Zilog Z16C30 Manuale Utente Pagina 124