Zilog Z16C30 Uživatelský manuál stáhnout pdf (Strana 123)

6-4

Z16C30 USC

®

USER'S MANUAL

UM97USC0100

ZILOG

6.2 FLYBY VS. FLOWTHROUGH DMA OPERATION (Continued)

Figure 6-3. Flyby DMA Transfer, Memory to Peripheral Device

DMAC

Memory Device

REQ

Address

Memory Location

/RD

Data

from Memory

to Device

/WR

If that's enough data for now

if the device wants more data

DMA Request

(e.g., /TxREQ)

Must be blocked

at USC

DMA Acknowledge

(e.g., /TxACK)

ACK

data

UM009402-0201

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