CS8900-CQ 查看數據表（PDF） - Cirrus Logic

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CS8900-CQ

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

4.3 Bus Interface Registers

CS8900

Bus Interface Register:

Product Identification Code (Read only)

Address 0000h

Address 0001h

First byte of EISA registration

number for

Crystal Semiconductor

Second byte of EISA

registration number for

Crystal Semiconductor

Address: PacketPage base + 0000h

Address 0002h

Address 0003h

First 8 bits of

Product ID Number

Last 3 bits of the Product ID

number (5 "X" bits are the

revision 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 CS8900. The host can use this

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

This register’s initial state after reset is:

The X XXXX codes for the CS8900 are:

Rev E: 0 0011

Rev F: 0 0101

0000 1110 0110 0011

0000 0000 000X XXXX

Bus Interface Register:

I/O Base Address (Read/Write)

Address 0020h

Most significant byte of I/O Base Address

Address: PacketPage base + 0020h

Address 0021h

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. The default location is

0300h.

After reset, if no EEPROM is found by the CS8900, 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.

0000 0011 0000 0000

38

DS150PP2

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