CS8900 查看數據表（PDF） - Cirrus Logic

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CS8900

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

Enter Packet Transmit Process

Exit: can’t Issue command

Note: Issuing a command

at this point will cause

previous transmit frame

to be lost.

Is

TxCMD

Yes pending?

No

Host Writes Transmit Command

to the TxCMD Register

Host Writes Transmit Frame

Length to the TxLength Register

Host Reads the BusST

Register (Register 18)

CS8900

Transmit Request

Rdy4

TxNOW

No

bit = 1?

Yes

Polling Loop

CS8900 Commits

Buffer Space to

Transmit Frame

Host Writes

Transmit Frame

to CS8900

CS8900

Transmits Frame

Exit Transmit Process

Figure 5.12. Transmit Operation in Polling Mode

102

DS150PP2

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