CS8900A-CQR Cirrus Logic Inc, CS8900A-CQR Datasheet - Page 25

• 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

DS271F5
initialization is complete (configuration loaded
from EEPROM or reset to default configura-
tion) the INITD bit is set (Register 16, SelfST,
bit 7).
3.5 Programming the EEPROM
After initialization, the host can access the EE-
PROM through the CS8900A by writing one of
seven commands to the EEPROM Command
3.5.2 EEPROM Command Execution
During the execution of a command, the two
CS8900A
Crystal LAN™ Ethernet Controller
Erase/Write Disable
Erase/Write Enable
Erase-All Registers
Write-All Register
Erase Register
[F:B]
Read Register
Write Register
[9:8]
[7:0]
Bit
[A]
Command
AD7 to AD0
OP1, OP0
ELSEL
Name
F
X
E
X
(bits 9,8)
Opcode
D
X
1,0
0,1
1.1
0,0
0,0
0,0
0,0
0,0
0,0
0,0
Reserved
External Logic Select: When clear, the EECS pin is used to select the EEPROM.
When set, the ELCS pin is used to select the external LA decode circuit.
Opcode: Indicates what command is being executed (see next section).
EEPROM Address: Address of EEPROM word being accessed.
C
X
Figure 5. EEPROM Command Register Format
CIRRUS LOGIC PRODUCT DATASHEET
B
X
EEPROM Address
word address
word address
word address
ELSEL OP1 OP0
XX00-XXXX
00XX-XXXX
XX10-XXXX
10XX-XXXX
XX01-XXXX
01XX-XXXX
(bits 7 to 0)
XX11-XXXX
11XX-XXXX
Table 8. EEPROM Commands
A
9
8
AD7 AD6
register (PacketPage base + 0040h). Figure 5
shows the format of the EEPROM Command
register.
3.5.1 EEPROM Commands
The seven commands used to access the EE-
PROM are: Read, Write, Erase, Erase/Write
Enable, Erase/Write Disable, Erase-All, and
Write-All. They are described in Table 8.
Opcode bits, followed by the six bits of address
(for a ’C46 or ’CS46) or eight bits of address
7
Data
yes
yes
yes
yes
no
no
no
no
no
no
no
6
Description
AD7 - AD0 used with 'C56,
'CS56, 'C66 and 'CS66
AD5 AD4
5
‘CS56, ‘C56, ‘CS66, ‘C66
‘CS56, ‘C56, ‘CS66, ‘C66
‘CS56, ‘C56, ‘CS66, ‘C66
‘CS56, ‘C56, ‘CS66, ‘C66
AD5 - AD0 used with
4
'C46 and 'CS46
EEPROM Type
AD3 AD2
‘CS46, ‘C46
‘CS46, ‘C46
‘CS46, ‘C46
‘CS46, ‘C46
3
all
all
all
2
AD1 AD0
1
0
Execution
10 ms
10 ms
10 ms
10 ms
10 ms
25 µs
Time
9 µs
9 µs
9 µs
9 µs
9 µs
25