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| 英文描述： | Home PHY Single-Chip 1/10Mbps Home Networking PHY? - (PDF) |
| 中文描述： | 首頁P(yáng)HY的單芯片1/10Mbps家庭網(wǎng)絡(luò)物理層？ - （PDF格式） |
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Am79C901A
63
P R E L I M I N A R Y
TBR16: 10BASE-T Status and Enable Register (Register 16)
The status bits indicate when there is a change in the
Link Status, Duplex Mode, Auto-Negotiation status,
or Speed status. Register 16 contains the status and
enable bits. The status is always updated whether or
not the enable bits are set. When a status change oc-
curs, the system will need to read this register to
clear the status bits. See Table 50.
Table 50.
TBR16: 10BASE-T Status and Enable Register (Register 16)
Note:
All bits, except bit 13, are cleared on read (COR). The register must be read twice to see if it has been cleared.
Bits
Name
Description
Read/
Write
Default Value
(hex)
15:14
Reserved
R
0
13
Status Test Enable
(Note 1)
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.
0 = Bits 4:1 are only set if the interrupt condition (if any
bits in 12:9 are set) occurs.
R/W
0
12
Link Status Change
Enable
1 = Link Status change enable
0 = This interrupt is masked
R/W
0
11
Duplex Mode Change
Enable
1 = Duplex Mode change enable
0 = This interrupt is masked
R/W
0
10
Auto-Negotiation Change
Enable
1 = Auto-Negotiation change enable
0 = This interrupt is masked
R/W
0
9
Speed Change Enable
1 = Speed change enable
0 = This interrupt is masked
R/W
0
8
Global Enable
1= Global interrupt enable
0 = This interrupt is masked
R/W
0
7:5
Reserved
R
0
4
Link Status Change
1 = Link Status has changed on a port
0 = No change in Link Status
R, LH
0
3
Duplex Mode Change
1 = Duplex Mode has changed on a port
0 = No change in Duplex mode
R, LH
0
2
Auto-Negotiation Change
1 = Auto-Negotiation status has changed on a port
0 = No change in Auto-Negotiation status
R, LH
0
1
Speed Change
1 = Speed status has changed on a port
0 = No change
R, LH
0
0
Global
1 = Indicates a change in status of any of the above
interrupts
0 = Indicates no change in Interrupt status
R, LH
0
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