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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 Table 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 MDC Yes