CS8900A datasheet(46/128 Pages) CIRRUS

46 / 128 page

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

4.3.11 EEPROM Command

(Read/Write, Address: PacketPage base + 0040h)

This register is used to control the reading, writing and erasing of the EEPROM. See Section 3.5.

ADD7-ADD0

Address of the EEPROM word being accessed.

OB1,OB0

Indicates the Opcode of the command being executed. See Table 7.

ELSEL

External logic select: When clear, the EECS pin is used to select the EEPROM. When set, the

ELCS pin is used to select the external LA decode circuit.

Reserved

Reserved and must be written as 0.

Reset value is: XXXX XXXX XXXX XXXX

4.3.12 EEPROM Data

(Read/Write, Address: PacketPage base + 0042h)

This register contains the word being written to, or read from, the EEPROM. See Section 3.5 on page 24.

Reset value is: XXXX XXXX XXXX XXXX

4.3.13 Receive Frame Byte Counter

(Read only, Address: PacketPage base + 0050h)

This register contains the count of the total number bytes received in the the current received frame. This count con-

tinuously increments as more bytes in this frame are received. See Section 5.2.9 on page 87.

Reset value is: XXXX XXXX XXXX XXXX

765

4321

ADD7 to ADD0

DCBA

Reserved

ELSEL

OB1

OB0

Address 0043h

Address 0042h

Most significant byte of the EEPROM data.

Least significant byte of the EEPROM data.

Address 0051h

Address 0050h

Most significant byte of the byte count.

Least significant byte of the byte count.

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