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AM79C874VC 数据表(PDF) 38 Page - Advanced Micro Devices

部件名 AM79C874VC
功能描述  NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver
PDF  60 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79C874VC 数据表(HTML) 38 Page - Advanced Micro Devices

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Am79C874
P R E L I M INARY
Power/Loopback Register (Register 19)
Table 22.
Power/Loopback Register (Register 19)
Reg
Bit
Name
Description
Read/
Write
Default
19
14:7
Reserved
RW
00
19
6
TP125
Transmit transformer ratio selection:
1 = 1.25:1
0 = 1:1
The default value of this bit is controlled by reset-read value of pin
20.
RW
0
19
5
Low Power Mode
1 = Enable advanced power saving mode.
0 = Disable advanced power saving mode
Note: Under normal operating conditions, this mode should never
be disabled. Power dissipation will exceed data sheet values, as
circuitry for both 10 Mbps and 100 Mbps will be turned on.
RW
1
19
4
Test Loopback
1 = Enable test loopback. Data will be transmitted from MII
interface to clock recovery and loopback to MII received data.
RW
0
19
3
Digital loopback
1 = Enable loopback.
0 = Normal operation.
RW
0
19
2
LP_LPBK
1 = Enable link pulse loopback.
0 = Normal operation.
RW
0
19
1
NLP Link Integrity
Test
1 = In Auto-Negotiation test mode, send NLP instead of FLP in
order to test NLP receive integrity.
0 = Sending FLP in Auto-Negotiation test mode.
RW
0
19
0
Reduce Timer
1 = Reduce time constant for Auto-Negotiation timer.
0 = Normal operation.
RW
0



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