CS8900-IQ 查看數據表（PDF） - Cirrus Logic

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CS8900-IQ

Crystal LAN™ ISA Ethernet Controller

Cirrus Logic 

CS8900A

Crystal LAN™ ISA Ethernet Controller

4.3 Bus Interface Registers

4.3.1 Product Identification Code

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

Address 0000h

First byte of EISA registration

number for

Crystal Semiconductor

Address 0001h

Second byte of EISA

registration number for Crys-

tal Semiconductor

Address 0002h

First 8 bits of

Product ID number

Address 00003h

Last 3 bits of the Product ID

number (5 “X” bits are the revi-

sion number)

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

register contains a unique 32-bit product ID code that identifies the chip as a CS8900A. The host can use this num-

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

Rev C: 0 1000

Rev D: 0 1001

4.3.2 I/O Base Address

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

Address 0021h

Most significant byte of I/O Base Address

Address 0020h

Least significant byte of I/O Base Address

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 75. 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 18.

Reset value is: 0000 0011 0000 0000

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