CS8900-IQ3 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CS8900-IQ3

Crystal LAN™ ISA Ethernet Controller

Cirrus Logic 

CS8900A

Crystal LAN™ ISA Ethernet Controller

After a reset, the ISA bus outputs INTRx and

DMARQx are 3-Stated, thus avoiding any interrupt

or DMA channel conflicts on the ISA bus at power-

up time.

3.3.4 Initialization

After each reset (except EEPROM Reset), the

CS8900A checks the sense of the EEDataIn pin to

see if an external EEPROM is present. If EEDI is

high, an EEPROM is present and the CS8900A au-

tomatically loads the configuration data stored in

the EEPROM into its internal registers (see next

section). If EEDI is low, an EEPROM is not

present and the CS8900A comes out of reset with

the default configuration shown in Table 3.

A low-cost serial EEPROM can be used to store

configuration information that is automatically

loaded into the CS8900A after each reset (except

EEPROM reset). The use of an EEPROM is op-

tional.

The CS8900A operates with any of six standard

EEPROM’s shown in Table 4.

PacketPage Register Register Descriptions

Address Contents

0020h 0300h

I/O Base Address*

0022h XXXX XXXX Interrupt Number

XXXX X100

0024h XXXX XXXX DMA Channel

XXXX XX11

0026h 0000h

DMA Start of Frame

Offset

0028h X000h

DMA Frame Count

002Ah 0000h

DMA Byte Count

002Ch XXX0 0000h Memory Base Address

0030h XXX0 0000h Boot PROM Base

Address

0034h XXX0 0000h Boot PROM Address

Mask

0102h 0003h

Register 3 - RxCFG

0104h 0005h

Register 5 - RxCTL

0106h 0007h

Register 7 - TxCFG

0108h 0009h

Register 9 - TxCMD

010Ah 000Bh

Register B - BufCFG

010Ch Undefined Reserved

010Eh Undefined Reserved

0110h Undefined Reserved

0112h 00013h

Register 13 - LineCTL

0114h 0015h

Register 15 - SelfCTL

0116h 0017h

Register 17 - BusCTL

0118h

0019h Register 19 - TestCTL

* I/O base address is unaffected by Software Suspend mode.

Table 3. Default Configuration

EEPROM Type

Size (16-bit words)

‘C46 (non-sequential)

64

‘CS46 (sequential)

64

‘C56 (non-sequential)

128

‘CS56 (sequential)

128

‘C66 (non-sequential)

256

‘CS66 (sequential)

256

Table 4. Supported EEPROM Types

CIRRUS LOGIC PRODUCT DATASHEET

DS271PP4

19

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