CS8900 データシートの表示（PDF） - Cirrus Logic

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CS8900

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

During the frame processing, the software should

advance the PDMA_START pointer. At the end of

processing a frame, pointer PDMA_START should

be made to align with a double-word boundary.

The software remains in the loop until the DMA

frame count read is zero.

CS8900

Host Enters Interrupt Routine

RxDMA

No

Frame

bit set?

Yes

Process other events

that caused interrupt

Read the DMA frame Count (CDMA)

(PacketPage base + 0028h)

Yes

CDMA

=0?

No

Process the

CDMA Frames

Process other events

that caused interrupt

Figure 5.7. RxDMA Only Operation

DS150PP2

93

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