CS8900A-CQZ View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CS8900A-CQZ

Crystal LAN™ Ethernet Controller

Cirrus Logic 

CS8900A

Crystal LAN™ Ethernet Controller

Enter Packet Transmit Process

Exit: can't Issue com m and

Note: Issuing a command

at this point will cause

previous transmit frame

to be lost.

Is

TxC M D

Yes pending?

No

Host W rites Transmit Command

to the TxCMD Register

Host W rites Transm it Fram e

Length to the TxLength Register

Host Reads the BusST

Register (Register 18)

Transm it Request

Rdy4

TxNOW

No

bit = 1?

Yes

Polling Loop

CS8900A Commits

Buffer Space to

Transmit Frame

Host W rites

Transmit Frame

to CS8900A

CS8900A

Transmits Frame

Exit Transmit Process

Figure 30. Transmit Operation in Polling Mode

5.6.8 Completing Transmission

When the CS8900A successfully completes

transmitting a frame, it sets the TxOK bit (Reg-

ister 8, TxEvent, Bit 8). If the TxOKiE bit (Reg-

ister 7, TxCFG, bit 8) is set, the CS8900A

generates a corresponding interrupt.

CIRRUS LOGIC PRODUCT DATASHEET

DS271F4

103

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