VSC8641XKO Vitesse Semiconductor Corp, VSC8641XKO Datasheet - Page 72

• Manufacturer Part Number: VSC8641XKO
• Description: IC PHY 10/100/1000 100-LQFP
• Manufacturer: Vitesse Semiconductor Corp
• Type: PHY Transceiverr

Specifications of VSC8641XKO

• Number Of Drivers/receivers: 1/1
• Protocol: Gigabit Ethernet
• Voltage - Supply: 2.5V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Case: TQFP
• Dc: 07+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 907-1031

Figure 18.
Revision 4.3
August 2009
21E.10:0 = Write Address
22E.7:0 = Data to Write
21E.13 = 1
21E.12 = 0
EEPROM Read and Write Register Flow
To read a value from a specific address of the EEPROM:
1. Read the VSC8641 device register bit 21E.11 and ensure that it is set.
2. Write the EEPROM address to be read to register bits 21E.10:0.
3. Set both register bits 21E.12 and 21E.13 both to 1.
4. When register bit 21E.11 changes to 1, read the 8-bit data value found at register
To write a value to a specific address of the EEPROM:
1. Read the VSC8641 device register bit 21E.11 and ensure that it is set.
2. Write the address to be written to register bits 21E.10:0.
3. Set register bit 21E.12 to 0.
4. Set register bits 22E.7:0 with the 8-bit value to be written to the EEPROM.
5. Set register bit 21E.13 to 1.
6. To avoid collisions during read and write transactions, always wait until register bit
bits 22E.15:8. This is the contents of the address just read by the PHY.
21E.11 changes to 1 before performing another EEPROM read or write operation.
Write EEPROM
Data
21E.10:0 = Address to Read
Wait for Ready
Read or Write
21E.12 = 1
START
Read EEPROM
21E.11 = 1
Data
21E.11 = 0
Read Data = 22E.15:8
Wait for Ready
21E.13 = 1
21E.11 = 1
VSC8641 Datasheet
21E.11 = 0
Configuration
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