Specifications
Rev. 1.43
User's Guide
17
2.8. I
2
C EEPROM
8 kbits of non-volatile memory is provided on the I2C bus.
This memory is used for board internal configuration (for example to store physical Fast Ethernet
addresses) and can also be used for user purposes.
2.9. Fast Ethernet ports
The two Fast Ethernet interfaces come directly from the MPC-8260 processor.
The physical layer is achieved with on-board fast Ethernet transceivers from SMSC: the LAN83C183.
The SMSC-LAN83C183 provides all of the IEEE 802.3u 100Base-TX and ISO802.3 10Base-T
Physical Layer (PHY) functions needed for workstations, bridge, router, and switch applications. It can
operate as a 100Mbps only device, or as a dual speed 10/100Mbps device with built-in auto-
negotiation possibility for speed selection. The SMSC-LAN83C183 supports the standard Media
Independent Interface (MII) for glueless interface with 10/100 Ethernet Media Access Controllers
(MAC).
The built-in IEEE 802.3u Auto-Negotiation feature automatically selects internal 10Base-T or
100Base-TX, full or half-duplex, as a result of negotiation between the station and its link partner.
The SMSC-LAN83C183 supports half and full-duplex operation at both 10Mbps and 100Mbps speeds.
It complies with ANSI X3T9 TP-PMD and includes MLT-3 Encoder/Decoder and Stream Cipher
scrambler/ de-scrambler functions for 100Base-TX.The SMSC-LAN83C183 supports Category 5
Unshielded Twisted Pair and Type 1 Shielded Twisted Pair wiring. The on-chip Serial Management
Interface features the Basic and Extended registers set. The 4B/5B Encoder and Decoder are also
included.
An on-board transformer provides a direct connection for a 10Base-T and 100Base-TX interface
2.10. SMC1 and SMC2 serial ports
The VSBC-6862 offers two RS-232 serial ports.
One of these general-purpose serial ports is available on the front panel RJ-45 connector, the other
one is available on an internal connector.
These serial ports can be typically used as system console ports.
Note that this type of port has no hardware flow control capability.
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