CS89712-CB View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS89712-CB

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

Cirrus Logic 

CS89712

Word Address

Value

FIRST WORD in DATA BLOCK

00h

A120h

FIRST GROUP of WORDS

01h

2020h

02h

0300h

03h

0003h

04h

0001h

SECOND GROUP of WORDS

05h

502Ch

06h

E000h

07

000Fh

08h

0000h

09h

000Dh

0Ah

C000h

0Bh

000Fh

THIRD GROUP of WORDS

0Ch

2158h

0Dh

0Eh

0Fh

CHECKSUM Value

10h

0010h

0000h

0000h

2800h

Description

Configuration Block Header.

The high byte, A1h, indicates a ‘C46 EEPROM is attached. The Link

Byte, 20h, indicates the number of bytes to be used in this block of config-

uration data.

Group Header for first group of words.

Three words to be loaded, beginning at 0020h in Ethernet Port memory.

I/O Base Address

Interrupt Number

DMA Channel Number

Group Header for second group of words.

Six words to be loaded, beginning at 002Ch in Ethernet Port memory.

Memory Base Address - low word

Memory Base Address - high word

Boot PROM Base Address - low word

Boot PROM Base Address - high word

Boot PROM Address Mask - low word

Boot PROM Address Mask - high word

Group Header for third group of words.

Three words to be loaded, beginning at 0158 in Ethernet Port memory.

Individual Address - Octet 0 and 1

Individual Address - Octet 2 and 3

Individual Address - Octet 4 and 5

The high byte, 28h, is the Checksum Value. In this example, the check-

sum includes word addresses 00h through 0Fh. The hexadecimal sum of

the bytes is D8h, resulting in a 2’s complement of 28h. The low byte, 00h,

provides a pad to the word boundary.

Note: FFFFh is a special code indicating that there are no more words in the EEPROM.

Table 5. EEPROM Configuration Block Example

2.6.3.1 Reset Configuration Block Structure

The Reset Configuration Block is a block of contig-

uous 16-bit words starting at EEPROM address

00h. It can be divided into three logical sections: a

header, one or more groups of configuration data

words, and a checksum value. All words in the Re-

set Configuration Block are read sequentially by

the Ethernet port after each reset, starting with the

header and ending with the checksum. Each group

of configuration data is used to program an Ether-

DS502PP2

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