2. Getting Started
18
Interrupt Selection
Configuration Register A
Backplane
Interrupt
Bit 5
INT2
Bit 4
INT1
Bit 3
INT0
Signal
Level
0
0
0
INTRQ1*
IR3
0
0
1
INTRQ2*
IR4
0
1
0
INTRQ4*
IR5
0
1
1
INTRQ*
IR9
1
0
0
FP3*
IR10
1
0
1
FP5*
IR11
1
1
0
FP7*
IR12
1
1
1
JPR SLCT
IR15
Status LEDs
Five LEDs are located at the top of the board to indicate network status. The LEDs from
left to right are: POLARITY (POL), COLLISION (COL), TRANSMIT (XMT), LINK (LNK)
and RECEIVE (REC).
•
The POL LED is lit when the TPI module detects seven consecutive link pulses or
three consecutive receive packets with reversed polarity.
•
The COL LED is lit for approximately 50 ms whenever a collision is detected.
•
The XMT LED is lit for approximately 50 ms whenever the on-board AT/LANTIC
controller transmits data.
•
In TPI mode, the LNK LED is lit while link pulses are being received. This indicates
that the twisted-pair connection is active.
•
The REC LED is lit for approximately 50 ms whenever received data is detected.
Configuration Options
Please refer to National Semiconductor's Local Area Networks data book for detailed
information on the DP83905 AT/LANTIC hardware for a more detailed explanation of
this section.
The ZT 8995 does not require many jumpers because most of the configuration options
for the board can be programmed by software. The serial EEPROM can also be written
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