dm9000a Davicom Semiconductor, Inc., dm9000a Datasheet - Page 6

• Manufacturer Part Number: dm9000a
• Description: Ethernet Controller With General Processor Interface
• Manufacturer: Davicom Semiconductor, Inc.

1. General Description
The DM9000A is a fully integrated and cost-effective
low pin count single chip Fast Ethernet 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 IO
tolerance.
The DM9000A supports 8-bit and 16-bit data
interfaces to internal memory accesses for various
2. Block Diagram
Final
Version: DM9000A-17-DS-F01
May 10, 2006
TX+/-
RX+/-
AUTO-MDIX
100 Base-TX
transceiver
PHYceiver
Autonegotiation
LED
100 Base-TX
10 Base-T
Tx/Rx
PCS
Ethernet Controller with General Processor Interface
processors. The PHY of the DM9000A can interface to the
UTP3, 4, 5 in 10Base-T and UTP5 in 100Base-TX with
HP Auto-MDIX. It is fully compliant with the IEEE 802.3u
Spec. Its auto-negotiation function will automatically
configure the DM9000A to take the maximum advantage of
its abilities. The DM9000A also supports IEEE 802.3x full-
duplex flow control..
MII Management
& MII Register
Control
MII
MAC
RX Machine
TX Machine
Registers
&Status
Control
EEPROM
Management
Interface
Internal
Memory
SRAM
DM9000A
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