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參數(shù)資料
| 型號： | AM79C875KI |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | NetPHY⑩ 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP100 |
| 封裝： | 14 X 20 MM, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 32/48頁 |
| 文件大?。?/td> | 2480K |
| 代理商： | AM79C875KI |
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32
Am79C875
Diagnostic Register (Register 18)
Table 18.
Reg
Bit
Description
Read/
Write
Default
18
15:12
Reserved
Ignore when read.
RO
0
18
11
DPLX
This bit indicates the result of the Auto-Negotiation for duplex
arbitration.
1 = Full Duplex.
0 = Half Duplex.
RO
0
18
10
Speed
This bit indicates the result of the Auto-Negotiation for data speed
arbitration.
1 = 100 Mbps.
0 = 10 Mbps.
RO
0
18
9
RX_PASS
In 10BASE-T mode, a 1 indicates that Manchester data has been
detected.
In 100BASE-TX mode, a 1 indicates a valid signal has been
received but not necessarily locked onto.
RO
0
18
8
RX_LOCK
1 = Received RLL has locked onto the received signal for selected
data-rate (10BASE-T or 100BASE-TX)
0 = Receive PLL has not locked onto received signal.
This bit remains set until read.
RO/RC
0
18
7:0
Reserved
Ignore when read.
RO
0x22
Diagnostic Register (Register 18)
Test Register (Register 19)
Table 19.
Reg
Bit
Name
Description
Read/
Write
Default
19
15:12
Reserved
Ignore when read, write as Default (0x1000).
RW
0x1000
19
11:8
Reserved
Ignore when read, write as Default (0x0010).
RW
0x0010
19
7
Reserved
Ignore when read, write as 0.
Selects transformer ratio.
1 = 1.25:1
0 = 1:1
The default value is controlled by the TP1_1 pin.
RW
0
19
6
1.25:1
RW
0
19
5
10/100 Mbps
Transmit
Compliance Test
This bit controls internal logic, including power-saving circuitry. For 10
and 100 Mbps transmit compliance testing ONLY, this bit must be
turned off, but should be turned on for normal operation. The default
is 1 (on).
1 = Normal operation.
0 = Compliance test mode.
RW
1
19
4:0
Reserved
Ignore when read, write as 0.
RW
0
Test Register (Register 19)
Miscellaneous Features 2 Register (Register 20)
Table 20.
Reg
Bit
Name
Description
Read/
Write
Default
20
15:12
Reserved
Ignore when read, write as Default (0x0110).
RW
0x0110
20
11:8
Reserved
Ignore when read, write as Default (0x1001).
RW
0x1001
20
7:4
Cable length
indicator
These bits are the cable length indicators. Increment from 0000 to
1111, or approximately every 10 meters. The equivalent is 0 to 32dB
with an increment of 2dB @ 100Mhz. The value is read back from the
equalizer, and the measured value is not absolute.
RO
0
20
3:0
Reserved
Ignore when read.
RO
0x0010
Miscellaneous Features 2 Register (Register 20)
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