CS8900A-CQ3 Cirrus Logic Inc, CS8900A-CQ3 Datasheet - Page 44

• Manufacturer Part Number: CS8900A-CQ3
• Description: Ethernet ICs IC 10Mbps Ethernet Controller 3.3V
• Manufacturer: Cirrus Logic Inc

Specifications of CS8900A-CQ3

• Ethernet Connection Type: 10Base- 2, 10Base- 5, 10Base- F, 10Base- T
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Controllers
• Standard Supported: IEEE 802.3
• Data Rate: 10 Mbps
• Maximum Operating Temperature: + 70 C
• Package / Case: LQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 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 19.
Reset value is: 0000 0011 0000 0000
4.3.3 Interrupt Number
(Read/Write, Address: PacketPage base + 0022h)
The Interrupt Number Register defines the interrupt pin selected by the CS8900A. In a typical application the follow-
44
First byte of EISA registration
Crystal Semiconductor
Rev B: 0 0111
Rev C: 0 1000
Rev D: 0 1001
Rev F: 0 1010
Address 0000h
Most significant byte of I/O Base Address
number for
Address 0021h
Address 0023h
00h
Crystal Semiconductor
registration number for
Second byte of EISA
CIRRUS LOGIC PRODUCT DATASHEET
Address 0001h
Product ID number
Address 0002h
0000 01XXb= All INTRQ pins high-impedance
First 8 bits of
Least significant byte of I/O Base Address
Interrupt number assignment:
Crystal LAN™ Ethernet Controller
0000 0000b= pin INTRQ0
0000 0001b= pin INTRQ1
0000 0010b= pin INTRQ2
0000 0011b= pin INTRQ3
Address 0020h
Address 0022h
Last 3 bits of the Product ID
number (5 “X” bits are the
revision number)
Address 00003h
CS8900A
DS271F5