Rev. 3.0, 03/01, page 135 of 390
(2) Master Status Register (IMSTSR)
Address: H'10007102 (Bank 0, Read)
Bit
7
6
5
4
3
2
1
0
Bit Name
-
TMI
TXI
RXI
IID2
IID1
IID0
-
Initial Value
-
0
0
0
0
0
0
-
R/W
-
R
R
R
R
R
R
-
Bit
Description
Default
7
Reserved
-
6
Timer Interrupt (TMI)
When set to 1, indicates a timer interrupt is pending.
-
5
Transmitter Interrupt (TXI)
When set to 1, indicates a transmitter interrupt is pending.
-
4
Receiver Interrupt (RXI)
When set to 1, indicates a receiver interrupt is pending. The following conditions clear the
Rx interrupt condition.
•
Reading the Rx Ring Frame Counter Low Register
•
Issuing a RESET, Rx SPECIAL CONDITION INTERRUPT command
•
Clearing the Rx Enable bit
•
HARDWARE REST
•
SOFTWARE RESET
-
3 - 1
Interrupt identification (IID[2:0])
These three bits correspond to interrupt identification ID2 - ID0 which provide an
alternative method for identifying the interrupt source by indicating the interrupt type and
priority level as shown below:
Interrupt Type ID2 ID1 ID0 Priority
Rx Special Condition 1 0 0 Highest
1.
FIFO Overrun
2.
Frame Error
3.
EOF
4.
Rx Abort
5.
Sync/Hunt
Rx Data Available 1 0 1 Second
Tx Buffer Empty 1 1 0 Third
Tx Special Condition 1 1 1 Fourth
1.
FIFO Underrun
2.
EOM
3.
Early EOM
-
0
Reserved
-
Summary of Contents for HD64465
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