User`s guide

1.3.1 Block Diagram
The EB140A–TX has the following main parts:
• Digital Semiconductor 21140A for 10/100-Mb/s media access control (MAC)
with MII, boot ROM, and serial ROM ports, and a PCI interface
• National DP83840 and DP83223 MII-based PHY chipset for a 10/100-Mb/s
physical interface
• Pulse Engineering PE68515 module for a 10/100-Mb/s magnetic network
connection
• Boot ROM interface supporting a ROM size of 64KB to 256KB ROM
• Direct MicroWire interface (4 pins) to a serial ROM port for storing the
Ethernet address, and the card configuration and control data
Figure 1–2 shows a block diagram of the EB140A–TX.
Figure 1–2 EB140A–TX Block Diagram
LJ-04832.AI5
Digital
Semiconductor
21140A
PCI Fast
Ethernet
LAN
Controller
PCI
Bus
10BASE-T
and
100BASE-TX
PHY Chipset
LEDs
Boot
ROM
Serial
ROM
Boot
ROM Port
MII
Port
Serial
ROM Port
10/100-Mb/s
Magnetics
10BASE-T/100BASE-TX
Network Connection
1–4 Preliminary—Subject to Change—July 1996