dp83848qsqx/nopb National Semiconductor Corporation, dp83848qsqx/nopb Datasheet - Page 48

• Manufacturer Part Number: dp83848qsqx/nopb
• Description: Phyter Extended Temperature Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver
• Manufacturer: National Semiconductor Corporation

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Bit
8
7
6
5
4
3
2
1
0
LOOPBACK_10_DIS
HEARTBEAT_DIS
FORCE_LINK_10
JABBER_DIS
RESERVED
RESERVED
RESERVED
POLARITY
Bit Name
LP_DIS
Default
RO/LH
0, RW
0, RW
0, RW
0, RW
0, RW
1, RW
0, RW
0, RW
10Base-T Loopback Disable:
In half-duplex mode, default 10BASE-T operation loops Transmit data to the
Receive data in addition to transmitting the data on the physical medium. This
is for consistency with earlier 10BASE2 and 10BASE5 implementations which
used a shared medium. Setting this bit disables the loopback function.
This bit does not affect loopback due to setting BMCR[14].
Normal Link Pulse Disable:
1 = Transmission of NLPs is disabled.
0 = Transmission of NLPs is enabled.
Force 10Mb Good Link:
1 = Forced Good 10Mb Link.
0 = Normal Link Status.
RESERVED: Must be zero.
10Mb Polarity Status:
This bit is a duplication of bit 12 in the PHYSTS register. Both bits will be
cleared upon a read of 10BTSCR register, but not upon a read of the PHYSTS
register.
1 = Inverted Polarity detected.
0 = Correct Polarity detected.
RESERVED: Must be zero.
RESERVED: Must be set to one.
Heartbeat Disable: This bit only has influence in half-duplex 10Mb mode.
1 = Heartbeat function disabled.
0 = Heartbeat function enabled.
When the device is operating at 100Mb or configured for full duplex
operation, this bit will be ignored - the heartbeat function is disabled.
Jabber Disable:
Applicable only in 10BASE-T.
1 = Jabber function disabled.
0 = Jabber function enabled.
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Description