CS8900A datasheet(104/128 Pages) CIRRUS

104 / 128 page

104

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

any yet-to-be-transmitted frames queued in the

on-chip memory, are cleared and not transmit-

ted. The host should make TxLength = 0 when

using the Force bit.

Or:

3) There is a transmit under-run, and the Tx-

Underrun bit (Register C, BufEvent, Bit 9) is

set.

Successful transmission is indicated when the

TxOK bit (Register 8, TxEvent, Bit 8) is set.

CS8900A Commits

Buffer Space to

Transmit Frame

Host Reads

ISQ

Host Reads the BusST

Transmit Request

Host Writes

Transmit Frame

to CS8900A

Host Writes Transmit Command

to the TxCMD Register

Host Writes Transmit Frame

Length to the TxLength Register

Rdy4Tx

bit = 1?

Exit Transmit Process

Yes

Rdy4

TxNOW

bit = 1?

Host Enters Interrupt Routine

Exit WAIT-for-interrupt

Process other events

that caused interrupt

Yes

TxCMD

pending?

Exit: can’t Issue command

Note: Issuing a command

at this point will cause

previous transmit frame

to be lost.

Enter Packet Transmit Process

CS8900A

Transmits Frame

Figure 31. Transmit Operation in Interrupt Mode

CS8900A Datasheet(PDF) 104 Page - Cirrus Logic

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