Datasheet 5

Networking Silicon — 82555

The 82555 provides a glueless interface to Intel components such as the 82557 Fast Ethernet

Controller, as well as any MII compatible device. Figure 4 shows a schematic-level diagram of the

82557 Fast Ethernet controller implementation connected to the 82555 using the MII interface.

2.3 Media Independent Interface (MII)

The 82555 supports the Media Independent Interface (MII) as its primary interface to the MAC.

The MII Interface is summarized in Tabl e 1.

Figure 4. Intel 82557/82555 Solution

82557
Flash
(optional)
EEPROM
(
optional
)

PCI Bus Si

g

nals

82555
RXD[3:0]
RXC
RXERR
RXDV
CRS
COL
TXD[3:0]
TXC
TXEN
MDC
MDIO
RESET

Table 1. 82555 MII

Signal
Name Description Direction Clock
Reference MII Signal Supported
by the 82555?
TXC Transmit Clock From 82555
(adapter mode only) -- Yes
TXD[3:0] Transmit Data From MAC TXC Yes
TXEN Transmit Enable From MAC TXC Yes
COL Collision Detect From 82555 Asynchronous Yes
CRS Carrier Sense From 82555 Asynchronous Yes
RXC Receive Clock From 82555 -- Yes
RXD[3:0] Receive Data From 82555 RXC Yes
RXDV Receive Data Valid From 82555 RXC Yes
RXERR Receive Error From 82555 RXC Yes
MDC Management Data
Clock From manager -- Yes
MDIO Management Data
Input/Output From manager MD C Yes