1. General Description
The DM9000 is a fully integrated and cost-effective
single chip Fast Ethernet MAC controller with a
general processor interface, a 10/100M PHY and 4K
Dword SRAM. It is designed with low power and high
performance process that support 3.3V with 5V
tolerance.
The DM9000 also provides a MII interface to connect
HPNA device or other transceivers that support MII
interface. The DM9000 supports 8-bit, 16-bit and 32-
bit uP interfaces to internal memory accesses for
2. Block Diagram
TX+/-
RX+/-
Final
Version: DM9000-DS-F02
June 26, 2002
ISA to Ethernet MAC Controller with Integrated 10/100 PHY
LED
PHYceiver
100 Base-TX
100 Base-TX
transceiver
PCS
10 Base-T
Tx/Rx
Autonegotiation
different processors. The PHY of the DM9000 can
interface to the UTP3, 4, 5 in 10Base-T and UTP5 in
100Base-TX. It is fully compliant with the IEEE 802.3u Spec.
Its auto-negotiation function will automatically configure the
DM9000 to take the maximum advantage of its abilities. The
DM9000 also supports IEEE 802.3x full- duplex flow control.
This programming of the DM9000 is very simple, so user
can port the software drivers to any system easily.
External MII
Interface
MAC
TX Machine
Control &Status
MII
Registers
RX Machine
MII Management
Control
& MII Register
DM9000
EEPROM
Interface
Memory
Management
Internal
SRAM
1
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