CS8900-CQ3 Cirrus Logic, CS8900-CQ3 Datasheet - Page 42

• Manufacturer Part Number: CS8900-CQ3
• Description: Crystal LAN ISA Ethernet Controller
• Manufacturer: Cirrus Logic

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
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:
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
42
First byte of EISA registration
Crystal Semiconductor
Address 0000h
Rev B: 0 0111
number for
Most significant byte of I/O Base Address
Address 0021h
registration number for Crys-
Second byte of EISA
CIRRUS LOGIC PRODUCT DATA SHEET
tal Semiconductor
Adress 0001h
Product ID number
Address 0002h
First 8 bits of
Crystal LAN™ ISA Ethernet Controller
Least significant byte of I/O Base Address
Address 0020h
number (5 “X” bits are the revi-
Last 3 bits of the Product ID
Address 00003h
sion number)
CS8900A
DS271PP3