CS8920A View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS8920A

Crystal LAN ISA Plug-and-Play Ethernet Controller

Cirrus Logic 

Prev 111 112 113 114 115 116 117 118 119 120 Next

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)

CS8920A

Transmit Request

Rdy4

TxNOW

No

bit = 1?

Yes

Polling Loop

CS8920A Commits

Buffer Space to

Transmit Frame

Host Writes

Transmit Frame

to CS8920A

CS8920A

Transmits Frame

Exit Transmit Process

Figure 5.12. Transmit Operation in Polling Mode

DS238PP2

111

Share Link: