dp83902a National Semiconductor Corporation, dp83902a Datasheet - Page 4

• Manufacturer Part Number: dp83902a
• Description: St-nictm Serial Network Interface Controller For Twisted Pair
• Manufacturer: National Semiconductor Corporation

BUS INTERFACE PINS
99 100
Pin No
PQFP
Connection Diagrams
2 0 Pin Description
1 2
95
96
98
Pin No
PLCC
8 – 11
5
6
7
Pin No
98 – 100
AVJG
96
92
93
95
INT
WACK
PRD
RA3 – RA0
Name
Pin
(Continued)
I O
O
O
See NS Package Number VJG100A
I
I
Order Number DP83902AVJG
INTERRUPT Indicates that the DP83902A requires CPU attention after
reception transmission or completion of DMA transfers The interrupt is cleared
by writing to the ISR (Interrupt Status Register) All interrupts are maskable
WRITE ACKNOWLEDGE Issued from system to DP83902A to indicate that
data has been written to the external latch The DP83902A will begin a write
cycle to place the data in local memory
PORT READ Enables data from external latch on to local bus during a
memory write cycle to local memory (remote write operation) This allows
asynchronous transfer of data from the system memory to local memory
REGISTER ADDRESS These four pins are used to select a register to be read
or written The state of these inputs is ignored when the DP83902A is not in
slave mode (CS high)
4
Description
TL F 11157 – 65