CS8900A datasheet(68/128 Pages) CIRRUS

номер детали	CS8900A

подробное описание детали	Crystal LAN ??ISA Ethernet Controller

PDF	128 Pages

Scroll/Zoom	100%

производитель	CIRRUS [Cirrus Logic]

домашняя страница	http://www.cirrus.com

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68 / 128 page

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

4.4.21 Register 18: Bus Status

(BusST, Read-only, Address: PacketPage base + 0138h)

BusST describes the status of the current transmit operation.

011000

These bits provide an internal address used by the CS8900A to identify this as the Bus Status

Bit 0.

TxBidErr

If set, the host has commanded the CS8900A to transmit a frame that the CS8900A will not

send. Frames that the CS8900A will not send are:

1) Any frame greater than 1514 bytes, provided that InhibitCRC

(Register 9, TxCMD, Bit C) is clear.

2) Any frame greater than 1518 bytes.

Note that this bit is not set when transmit frames are too short.

Rdy4TxNOW

Rdy4TxNOW signals the host that the CS8900A is ready to accept a frame from the host for

transmission. This bit is similar to Rdy4Tx (Register C, BufEvent, Bit 8) except that there is no

interrupt associated with Rdy4TxNOW. The host can poll the CS8900A and check

Rdy4TxNOW to determine if the CS8900A is ready for transmit. (See Section 5.7 on page 99

for a description of the transmit bid process.)

Reset value is: 0000 0000 0001 1000

765

4321

TxBidErr

011000

DCBA

Rdy4Tx NOW

CS8900A датащи(PDF) 68 Page - Cirrus Logic