QT2022/32 - Data Sheet: DS3051
Each XFP module has a 2-wire serial interface which is an I2C interface. The QT2022/32 acts as the bus master to
read from or write to the XFP module. Since the XFP module has the same slave address as the EEPROM slave
address for XENPAK mode, the EEPROM and XFP module cannot exist at the same time. The XFP mode is
selected using the XFP control pin. All the XFP module access through MDIO is indirect access. The detailed
description of XFP module access is described in the EEPROM section (See “Two Wire (EEPROM) Interface” on
page 79.). Single byte and 256 byte read and write are supported for XFP module access through the QT2022/32.
Packet error checking for read and write operations are not supported by QT2022/32.
The following functions, which are specifically for XENPAK EEPROMs, are disabled in XFP mode:
•
•
•
•
•
•
EEPROM checksum
DOM capability
EEPROM protect capability
PMA/PMD type control through eeprom
tx_flag and rx_flag for generating LASI ALARM
PMA/PMD Identifier (OUI)
See “QAN0026: QT2022C1 & QT2032A1 Implementation and Usage Tips for XFP Applications”, referenced in
Table 77, for more information.
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