CS8900A datasheet(42/128 Pages) CIRRUS

42 / 128 page

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

4.3 Bus Interface Registers

4.3.1 Product Identification Code

(Read only, Address: PacketPage base + 0000h)

The Product Identification Code Register is located in the first four bytes of the PacketPage (0000h to 0003h). The

ber to determine which software driver to load and to check which features are available.

Reset value is: 0000 1110 0110 0011 0000 0000 000X XXXX

The X XXXX codes for the CS8900A are:

Rev B: 0 0111

4.3.2 I/O Base Address

(Read/Write, Address: PacketPage base + 0020h)

The I/O Base Address Register describes the base address for the sixteen contiguous locations in the host system’s

I/O space, which are used to access the PacketPage registers. See Section 4.10 on page 76. The default location

is 0300h.

After reset, if no EEPROM is found by the CS8900A, then the register has the following initial state. If an EEPROM

is found, then the register’s initial value may be set by the EEPROM. See Section 3.3 on page 19.

Reset value is: 0000 0011 0000 0000

Address 0000h

Adress 0001h

Address 0002h

Address 00003h

First byte of EISA registration

number for

Crystal Semiconductor

Second byte of EISA

registration number for Crys-

tal Semiconductor

First 8 bits of

Product ID number

Last 3 bits of the Product ID

number (5 “X” bits are the revi-

sion number)

Address 0021h

Address 0020h

Most significant byte of I/O Base Address

Least significant byte of I/O Base Address

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