CS8900A datasheet(102/128 Pages) CIRRUS

102 / 128 page

102

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

mode). If the transmit length is erroneous, the

command is discarded and the TxBidErr, bit 7,

in BusST register is set.

3) The host reads the BusST register. This read is

performed in memory mode by reading Regis-

ter 18, at memory base + 0138h. In I/O mode,

the host must first set the PacketPage Pointer at

CS8900A Commits

Buffer Space to

Transmit Frame

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

Exit Transmit Process

Yes

Enter Packet Transmit Process

Rdy4

TxNOW

bit = 1?

Polling Loop

Yes

TxCMD

pending?

Exit: can’t Issue command

Note: Issuing a command

at this point will cause

previous transmit frame

to be lost.

CS8900A

Transmits Frame

Figure 30. Transmit Operation in Polling Mode

CS8900A Datasheet(PDF) 102 Page - Cirrus Logic

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