Zilog Z16C30 Manuale Utente Scaricare il pdf (Pagina 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

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 207 208

Nessun commento

Zilog Z16C30 Manuale Utente Pagina 123