CS8900A-CQR Cirrus Logic Inc, CS8900A-CQR Datasheet - Page 22

• Manufacturer Part Number: CS8900A-CQR
• Description: Ethernet ICs IC 10Mbps Ethernet Controller 5V
• Manufacturer: Cirrus Logic Inc

Specifications of CS8900A-CQR

• 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

* FFFFh is a special code indicating that there are no more words in the EEPROM.
the EEPROM). Address space 80h to AFh is
reserved.
3.4.3.1 Reset Configuration Block Structure
The Reset Configuration Block is a block of
contiguous 16-bit words starting at EEPROM
address 00h. It can be divided into three logi-
cal sections: a header, one or more groups of
configuration data words, and a checksum val-
ue. All of the words in the Reset Configuration
Block are read sequentially by the CS8900A
after each reset, starting with the header and
FIRST WORD in DATA BLOCK
FIRST GROUP of WORDS
SECOND GROUP of WORDS
THIRD GROUP of WORDS
CHECKSUM Value
22
Word Address
0Ch
0Dh
0Ah
0Bh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
10h
A120h
502Ch
E000h
000Dh
C000h
2020h
0300h
0003h
0001h
000Fh
0000h
000Fh
2158h
0010h
0000h
0000h
2800h
Value
Table 7. EEPROM Configuration Block Example
CIRRUS LOGIC PRODUCT DATASHEET
Configuration Block Header.
The high byte, A1h, indicates a ‘C46 EEPROM is attached. The Link Byte,
20h, indicates the number of bytes to be used in this block of configuration
data.
Group Header for first group of words.
Three words to be loaded, beginning at 0020h in PacketPage memory.
I/O Base Address
Interrupt Number
DMA Channel Number
Group Header for second group of words.
Six words to be loaded, beginning at 002Ch in PacketPage memory.
Memory Base Address - low word
Memory Base Address - high word
Boot PROM Base Address - low word
Boot PROM Base Address - high word
Boot PROM Address Mask - low word
Boot PROM Address Mask - high word
Group Header for third group of words.
Three words to be loaded, beginning at 0158 in PacketPage memory.
Individual Address - Octet 0 and 1
Individual Address - Octet 2 and 3
Individual Address - Octet 4 and 5
The high byte, 28h, is the Checksum Value. In this example, the checksum
includes word addresses 00h through 0Fh. The hexadecimal sum of the
bytes is D8h, resulting in a 2’s complement of 28h. The low byte, 00h, pro-
vides a pad to the word boundary.
ending with the checksum. Each group of con-
figuration data is used to program a Packet-
Page register (or set of PacketPage registers
in some cases) with an initial non-default val-
ue.
3.4.3.2 Reset Configuration Block Header
The header (first word of the block located at
EEPROM address 00h) specifies the type of
EEPROM used, whether or not a Reset Con-
figuration block is present, and if so, how many
Description
Crystal LAN™ Ethernet Controller
CS8900A
DS271F5