am79c961 Advanced Micro Devices, am79c961 Datasheet - Page 100

• Manufacturer Part Number: am79c961
• Description: Pcnettm-isa Jumperless Single-chip Ethernet Controller For Isa
• Manufacturer: Advanced Micro Devices

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13
12
11
AMD
LCOL
LCAR
RES
reached. Upon UFLO error, the
transmitter is turned off (CSR0,
TXON = 0). UFLO is written by
the PCnet-ISA
RESERVED bit. The PCnet-
ISA+ controller will write this bit
with a “0”.
LATE COLLISION indicates that
a collision has occurred after the
slot time of the channel has
elapsed. The PCnet-ISA
troller does not re-try on late
collisions. LCOL is written by the
PCnet-ISA+ controller.
LOSS OF CARRIER is set in AUI
mode when the carrier is lost
during an PCnet-ISA
initiated
PCnet-ISA
stop transmission upon loss of
carrier. It will continue to transmit
the whole frame until done.
LCAR is written by the PCnet-
ISA
In 10BASE-T mode, LCAR will
be set when the T-MAU is in link
fail state.
+
controller.
+
transmission.
controller does not
+
controller.
+
controller-
P R E L I M I N A R Y
+
con-
The
Am79C961
10
09-00
RTRY
TDR
RETRY ERROR indicates that
the transmitter has failed after 16
attempts to successfully transmit
a message, due to repeated colli-
sions on the medium. If DRTY = 1
in the MODE register, RTRY will
set after one failed transmission
attempt. RTRY is written by the
PCnet-ISA
TIME
TOMETRY reflects the state of
an internal PCnet-ISA
counter that counts at a 10 MHz
rate from the start of a transmis-
sion to the occurrence of a
collision or loss of carrier. This
value is useful in determining the
approximate distance to a cable
fault. The TDR value is written by
the PCnet-ISA
valid only if RTRY is set.
Note that 10 MHz gives very low
resolution and in general has not
been found to be particularly use-
ful. This feature is here primarily
to maintain full compatibility with
the LANCE.
DOMAIN
+
controller.
+
controller and is
+
REFLEC-
controller