dp83846a National Semiconductor Corporation, dp83846a Datasheet - Page 42

• Manufacturer Part Number: dp83846a
• Description: Dsphyter ? Single 10/100 Ethernet Transceiver
• Manufacturer: National Semiconductor Corporation

15:9
Bit
8
7
6
5
4
3
2
1
0
LOOPBACK_10_DIS
FORCE_POL_COR
HEARTBEAT_DIS
FORCE_LINK_10
AUTOPOL_DIS
JABBER_DIS
RESERVED
POLARITY
Bit Name
Unused
LP_DIS
Table 22. 10Base-T Status/Control Register (10BTSCR), Address 0x1A
Default
RO/LH
0, RW
0, RW
0, RW
0, RW
0, RW
1, RW
0, RW
0, RW
0,RO
10Base-T Loopback Disable:
This bit is OR’ed with bit 14 (Loopback) in the BMCR.
1 = 10BT Loopback is disabled.
0 = 10BT Loopback is enabled.
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.
Force 10Mb Polarity Correction:
1 = Force inverted polarity.
0 = Normal polarity.
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 PHYSIS register.
1 = Inverted Polarity detected.
0 = Correct Polarity detected.
Auto Polarity Detection & Correction Disable:
1 = Polarity Sense & Correction disabled.
0 = Polarity Sense & Correction enabled.
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 func-
tion is disabled.
Jabber Disable:
Applicable only in 10BASE-T.
1 = Jabber function disabled.
0 = Jabber function enabled.
42
Description
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