AM79C985KCW AMD [Advanced Micro Devices], AM79C985KCW Datasheet - Page 28

• Manufacturer Part Number: AM79C985KCW
• Manufacturer: AMD [Advanced Micro Devices]

Enable Automatic Receiver Polarity Reversal (Per TP
Port)
SI Data
SO Data (Pri)
SO Data (Sec)
This command enables the Automatic Receiver Polarity
Reversal function for the TP port designated by the three
least-significant bits in the command byte. If enabled in
a TP port, the eIMR+ chip will automatically invert the
polarity of that port’s receiver circuitry if the TP port is
detected as having reversed polarity (due to wiring er-
ror). After reversing the receiver polarity, the TP port
could then receive subsequent (reverse polarity) packets
correctly. Designated port values of b111 through b100
in the command byte correspond to TP7 through TP4 in
the primary eIMR+ device. Designated port values of
b011 through b000 in the command byte correspond to
TP3 through TP0 in the secondary eIMR+ device.
Disable Receiver Extended Distance Mode (Per TP
Port)
SI Data
SO Data (Pri)
SO Data (Sec)
This command disables the Receiver Extended Dis-
tance Mode and restores the RXD circuit of the trans-
ceiver to normal squelch levels for the TP-port driver
designated by the three least-significant bits of the com-
mand data. Designated port values of b111 through
b100 in the command byte correspond to TP7 through
TP4 in the primary eIMR+ device. Designated port val-
ues of b011 through b000 in the command byte corre-
spond to TP3 through TP0 in the secondary eIMR+
device.
Enable Receiver Extended Distance Mode (Per TP
Port)
SI Data
SO Data (Pri)
SO Data (Sec)
This command modifies the RXD circuit of the trans-
ceiver for the TP-port driver designated by the three
least-significant bits of the command data. The RXD
squelch-threshold value is lowered to accommodate
signal attenuation associated with lines longer than 100
meters. Designated port values of b111 through b100
in the command byte correspond to TP7 through TP4
in the primary eIMR+ device. Designated port values of
b011 through b000 in the command byte correspond to
TP3 through TP0 in the secondary eIMR+ device. At
reset, Receiver Extended Distance Mode is disabled
and the RXD circuit defaults to normal squelch-thresh-
old values.
28
0111 0###
None
None
0110 1###
None
None
0111 1###
None
None
P R E L I M I N A R Y
Am79C985
Disable Software Override of LEDs
(Per Port - AUI and TP, Global)
SI Data
SO Data (Pri)
SO Data (Sec)
This command Disables software override of the Port
LEDs.
Individual LEDs and combinations of LEDs can be se-
lected via the lower four bits of the command byte, as
follows:
Following command execution, the attributes displayed
on the LEDs will be determined by LDC
override of LEDs is disabled after reset.
Enable Software Override of Bank-A LEDs (Per Port -
AUI and TP, Global)
SI Data
SO Data (Pri)
SO Data (Sec)
This command forces the LEDs in Bank A to blink. In-
dividual LEDs and combinations of LEDs can be select-
ed via the lower four bits of the command byte, as
follows:
The designated LED drivers(s) will switch between
LOW and ‘off’ at the rate set by the Software Override
Blink Rate command. Enable Software Override of
Bank A LEDs references the blink rate last issued, and
overrides any other attribute specified by LDC
ware override of LEDs is disabled after reset.
####
0000-0111 TP0 - TP7
1000
1001
1010
1011
1100
1101
1110
1111
####
0000-0111 TP0 - TP7
1000
1001
1010
1011
1100
1101
1110
1111
1001 ####
None
None
Port(s) affected
Primary AUI
Secondary AUI
Both AUI ports
All TP ports
All ports
Primary Global
Secondary Global
All Global
1011 ####
None
None
Port(s) affected
Primary AUI
Secondary AUI
Both AUI ports
All TP ports
All ports
Primary Global
Secondary Global
All Global
0-2
. Software
0-2
. Soft-