AM79C874VC AMD (ADVANCED MICRO DEVICES), AM79C874VC Datasheet - Page 59

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

Specifications of AM79C874VC

• Lead Free Status / RoHS Status: Not Compliant

ERRATA FOR REVISION [B.7] SILICON
NetPHY-1LP Revision B.7 is the current production re-
vision silicon with errata– please refer to the descrip-
tions below.
Revision [B.7] Errata Summary
The NetPHY-1LP device has a total of 3 errata, all of
which are minor and should not cause concern.
All information below should be used in conjunction
with the latest NetPHY-1LP Datasheet PID 22235,
available on the AMD website (www.amd.com).
Errata for NetPHY-1LP [B.7]
The SYMPTOM section gives an external description
of the problem. The IMPLICATION section explains
how the device behaves and its impact on the system.
The WORKAROUND section describes a workaround
for the problem. The STATUS section indicates when
and how the problem will be fixed.
B7 Errata 1- Advanced LED Mode Activity
SYMPTOM:
In Advanced LED mode, the two bi-color LEDs show
Link status by turning on, Speed status by which bi-
color LED turns on, and Duplex status by their color.
Activity is shown by blinking the bi-color LED off for
one-fourth of a second. If set to show TX and RX ac-
tivity in Half Duplex, the bi-color LED will remain turned
off for the duration of the packet burst if TX and RX are
in opposite phase.
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D A T A
S H E E T
Am79C874
WORKAROUND:
1. Set Register 21, Bit 10 to 1. This will cause the Ac-
2. Use Normal LED mode to ensure accurate Link and
STATUS:
This errata will not be fixed.
B7 Errata 2 - Auto-Negotiation ACK Bit
SYMPTOM:
During Auto-Negotiation, the ACK bit is set regardless
of the time interval between the FLP burst received.
WORKAROUND:
None. It is unlikely that the other device will incorrectly
generate FLPs.
STATUS:
This errata will not be fixed.
B7 Errata 3 - Missing or Distorted /T/R/
SYMPTOM:
The device accepts frames without the proper End Of
Stream delimiter /T/R/.
WORKAROUND:
None. It is unlikely that the other device will generate
this error. It could be generated by a noise event in the
cable occurring in this specific location of a packet.
The effect would be to add 8 dribbling bits to the end of
the packet. The MAC will catch this as an alignment
error or a CRC error.
STATUS:
This errata will not be fixed.
tivity blink to occur only for RX in Half Duplex (just
like Full Duplex).
Activity LED status in Half Duplex mode.
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