AM79C874VC AMD (ADVANCED MICRO DEVICES), AM79C874VC Datasheet - Page 40

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

Specifications of AM79C874VC

• Lead Free Status / RoHS Status: Not Compliant

40
Reg
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Reserved
Force_Link_10
Force_Link_100
Jabber Disable
7_Wire_Enable
CONF_ALED
LED_SEL
FEF_DISABLE
Force FEF
Transmit
RX_ER_CNT Full When Receive Error Counter is full, this bit will be set to 1.
Disable
RX_ER_CNT
DIS_WDT
EN_RPBK
EN_SCRM
PCSBP
FX_SEL
Table 27. Mode Control Register (Register 21)
Description
1 = Force link up without checking NLP. Forced during local
loopback.
0 = Normal Operation.
1 = Ignore link in 100BASE-TX and transmit data. Auto-
Negotiation must be disabled at this time (pin 56 tied low).
0 = Normal Operation.
1 = Disable Jabber function in PHY.
0 = Enable Jabber function in PHY.
1 = Enable 7-wire interface for 10BASE-T operation. This bit is
useful only when the chip is not in PCS bypass mode.
0 = Normal operation.
This bit is only applicable to Advanced LED Mode and Duplex
operation.
1 = Activity LED only responds to receive operation.
0 = Activity LED responds to receive and transmit operations for
Half Duplex. LED responds to receive activity in Full Duplex
operation.
This bit should be ignored when Register 0.8 is set to 1.
1 = Select NetPHY-1LP device‘s Standard LED configuration.
0 = Use the Advanced LED configuration.
0 = Enable far-end-fault generation and detection function.
1 = Disable far-end-fault.
This bit should be ignored when FX mode is disabled.
This bit is set to force to transmit Far End Fault (FEF) pattern.
1 = Disable Receive Error Counter.
0 = Enable Receive Error Counter.
1 = Disable the watchdog timer in the decipher.
0 = Enable watchdog timer.
1 = Enable remote loopback (MDI loopback for 100BASE-TX).
0 = Disable remote loopback.
1 = Enable data scrambling.
0 = Disable data scrambling.
When FX mode is selected, this bit will be forced to 0.
1 = Bypass PCS.
0 = Enable PC.
1 = FX mode selected.
0 = Disable FX mode.
D A T A
Am79C874
S H E E T
RO/ RC
Read/
Write
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RO
SCRAM_EN
PCSBP pin
FX_SEL pin
TECH[2:0],
LED_SEL
FX_SEL,
Default
LEDRX/
ANEGA
Set by
Set by
Set by
Set by
Set by
22235K
pins
pin
0
0
0
0
0
0
0
0
0
0
0