CS8900-CQ View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS8900-CQ

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

Acronyms Specific to the CS8900

BufCFG

BufEvent

BusCTL

BusST

ENDEC

ISQ

LineCTL

LineST

RxCFG

RxCTL

RxEvent

SelfCTL

SelfST

TestCTL

TxCFG

TxCMD

TxEvent

Buffer Configuration - Register B

Buffer Event - Register C

Bus Control - Register 17

Bus State - Register 18

Manchester encoder/decoder

Interrupt Status Queue - register 0

Ethernet Line Control - Register 13

Ethernet Line Status - Register 14

Receive Configuration - Register 3

Receive Control - Register 5

Receive Event - Register 4

Self Control - Register 15

Self Status - Register 16

Test Control - Register 19

Transmit Configuration - Register 7

Transmit Command - Register 9

Transmit Event - Register 8

CS8900

Terms Specific to the CS8900

Act-Once bit

A control bit that causes the CS8900 to take a certain action once when a logic "1" is written to

that bit. To cause the action again, the host must rewrite a "1".

Committed Receive Frame

A receive frame is said to be "committed" after the frame has been buffered by the CS8900,

and the host has been notified, but the frame has not yet been transferred by the host.

Committed Transmit Frame

A transmit frame is said to be "committed" after the host has issued a Transmit Command, and

the CS8900 has reserved buffer space and notified the host that it is ready for transmit.

Event or Interrupt Event

The term "Event" is used in this document to refer to something that can trigger an interrupt.

Items that are considered "Events" are reported in the three Event registers (RxEvent, TxEvent,

or BufEvent) and in two counter-overflow bits (RxMISS and TxCOL).

StreamTransfer

A method used to significantly reduce the number of interrupts to the host processor during

block data transfers (Patent Pending).

128

DS150PP2

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