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CS89712-CB

High-Performance, Low-Power System-on-Chip with 10BASE-T Ethernet Controller

Cirrus Logic 

CS89712

cally loaded into the Ethernet port after each reset

(except EEPROM reset).

The CS89712 Ethernet operates with any of six

standard EEPROMs shown in Table 3.

Ethernet Port Register Register Descriptions

Address Contents

0020h

0300h

I/O Base Address

0022h

XXXX XXXX Interrupt Number

XXXX X100

0102h

0003h

RxCFG Register

0104h

0005h

RxCTL Register

0106h

0007h

TxCFG Register

0108h

0009h

TxCMD Register

010Ah

000Bh

BufCFG Register

010Ch

Undefined Reserved

010Eh

Undefined Reserved

0110h

Undefined Reserved

0112h

00013h

LineCTL Register

0114h

0015h

SelfCTL Register

0116h

0017h

BusCTL Register

0118h

0019h

TestCTL Register

Table 2. Default Configuration

Note: I/O base address is unaffected by Software

Suspend mode.

EEPROM Type

‘C46 (non-sequential)

‘CS46 (sequential)

‘C56 (non-sequential)

‘CS56 (sequential)

‘C66 (non-sequential)

‘CS66 (sequential)

Size (16-bit words)

64

64

128

128

256

256

Table 3. Supported EEPROM Types

2.6 Ethernet EEPROM Configurations

2.6.1 EEPROM Interface

The EEPROM interface uses the signals shown in

Table 4.

Ethernet port

Pin

Ethernet port

Function

EECS

EEPROM Chip Select

EESK

1 MHz EEPROM

Serial Clock output

EEDO

EEPROM Data Out

(data to EEPROM)

EEDI

EEPROM Data in

(data from EEPROM)

EEPROM

Pin

Chip Select

Clock

Data In

Data Out

Table 4. EEPROM Interface

2.6.2 EEPROM Memory Organization

If an EEPROM is used to store initial configuration

information for the Ethernet port, the EEPROM is

organized in one or more blocks of 16-bit words.

The first block in EEPROM, referred to as the Con-

figuration Block, is used to configure the Ethernet

port after reset. An example of a typical Configura-

tion Block is shown in Table 5. Additional blocks

containing user data may be stored in the EE-

PROM. However, the Configuration Block must

always start at address 00h and be stored in contig-

uous memory locations.

2.6.3 Reset Configuration Block

The first block in EEPROM, the Reset Configura-

tion Block, is used to automatically program the

Ethernet port with an initial configuration after a

reset. Additional user data may also be stored in the

EEPROM if space is available. The additional data

are stored as 16-bit words and can occupy any EE-

PROM address space beginning immediately after

the end of the Reset Configuration Block up to ad-

dress 7Fh, depending on EEPROM size. This addi-

tional data can only be accessed through software

control (refer to Section 2.24 for more informa-

tion). Address space 80h to AFh is reserved.

12

DS502PP2

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