AM79C874VC AMD (ADVANCED MICRO DEVICES), AM79C874VC Datasheet - Page 39

• Manufacturer Part Number: AM79C874VC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C874VC

• Lead Free Status / RoHS Status: Not Compliant

22235K
Reg
19
19
19
19
19
19
19
19
15:7
Bit
6
5
4
3
2
1
0
Name
Reserved
TP125
Low Power Mode
Test Loopback
Digital loopback
LP_LPBK
NLP Link Integrity
Test
Reduce Timer
Table 26. Power/Loopback Register (Register 19)
Description
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.
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.
1 = Enable test loopback. Data will be transmitted from MII
interface to clock recovery and loopback to MII received data.
1 = Enable loopback.
0 = Normal operation.
1 = Enable link pulse loopback.
0 = Normal operation.
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.
1 = Reduce time constant for Auto-Negotiation timer.
0 = Normal operation.
D A T A
S H E E T
Am79C874
Read/
Write
RW
RW
RW
RW
RW
RW
RW
RW
Default
00
0
1
0
0
0
0
0
39