DP83905AVQB National Semiconductor, DP83905AVQB Datasheet - Page 8

• Manufacturer Part Number: DP83905AVQB
• Description: IC CONTROLR AT/LAN TP IN 160PQFP
• Manufacturer: National Semiconductor
• Series: AT/LANTIC™r

Specifications of DP83905AVQB

• Controller Type: AT, LAN Twisted-Pair Interface Controller
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 100mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Other names: *DP83905AVQB

3 0 Simplified Application Diagram
4 0 Functional Description
The AT LANTIC Controller is a highly integrated and config-
urable Ethernet controller making it suitable for most Ether-
net applications The AT LANTIC Controller integrates the
functions of the following blocks
1 DP8390 Ethernet Controller Core and Media Access
2 ISA Bus Interface containing all logic required to connect
3 Media Interface which includes an Encoder Decoder
Control logic
the DP8390 core to a packet buffer RAM and the ISA
bus
block with an AUI (Attachment Unit Interface) and a
10BASE-T Twisted Pair Interface
8
4 1 BUS INTERFACE BLOCK
The AT LANTIC Controller’s Bus interface block provides
the circuitry to interface the Ethernet controller logic and
the external packet buffer RAM to an ISA (Industry Standard
Architecture) Bus The bus interface provides several con-
figuration modes which offer various different features de-
pending on the designer’s specific design requirements
The possible modes are
1 16-Bit or 8-Bit Shared Memory Compatible Mode
2 16-Bit or 8-Bit Shared Memory Enhanced Mode
3 16-Bit or 8-Bit I O Port Compatible Mode
4 16-Bit or 8-Bit I O Port Enhanced Mode
This section describes the function of each of these modes
TL F 11498 – 3