TBR16: 10BASE-T INTERRUPT Status and Enable
Register (Register 16)
and interrupt enable bits. The status is always updated
whether or not the interrupt enable bits are set. When
an interrupt occurs, the system will need to read the in-
terrupt register to clear the status bits and determine
the course of action needed. See Table 74.
The Interrupt bits indicate when there is a change in the
Link Status, Duplex Mode, Auto-Negotiation status, or
Speed status. Register 16 contains the interrupt status
Table 74. TBR16: 10BASE-T INTERRUPT Status and Enable Register (Register 16)
Read/
H/W or Soft
Reset
Bit(s)
Name
Description
Write
15:14
Reserved
RO
0
1 = When this bit is set, setting bits 12:9 of this register
will cause a condition that will set bits 4:1
accordingly. The effect is to test the register bits with
a forced interrupt condition.
Interrupt Test Enable
(Note 1)
13
R/W
0
0 = Bits 4:1 are only set if the interrupt condition (if any
bits in 12:9 are set) occurs.
Link Status Change
Enable
1 = Link Status Change enable
0 = This interrupt is masked
R/W
R/W
R/W
R/W
0
0
0
0
12
11
10
9
Duplex Mode Change
Enable
1 = Duplex Mode Change enable
0 = This interrupt is masked
Auto-Neg Change
Enable
1 = Auto-Negotiation Change enable
0 = This interrupt is masked
Speed Change
Enable
1 = Speed Change enable
0 = This interrupt is masked
Global
Enable
1= Global Interrupt enable
0 = This interrupt is masked
R/W
RO
0
0
0
8
7:5
Reserved
1 = Link Status has changed on a port
0 = No change in Link Status
RO,
LH
4
3
2
1
Link Status Change
1 = Duplex Mode has changed on a port
0 = No change in Duplex mode
RO,
LH
Duplex Mode Change
Auto-Negotiation Change
Speed Change
0
0
0
1 = Auto-Neg status has changed on a port
0 = No change in Auto-Neg status
RO,
LH
1 = Speed status has changed on a port
0 = No change
RO,
LH
1 = Indicates a change in status of any of the above
interrupts
RO,
LH
Global
0
0
0 = Indicates no change in Interrupt Status
Note:
1. All bits, except bit 13, are cleared on read (COR). The register must be read twice to see if it has been cleared.
Am79C978
195
AMD [ AMD ]
