AM79C985KCW AMD [Advanced Micro Devices], AM79C985KCW Datasheet - Page 30

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

TP Port Partitioning Status
SI Data
SO Data (Sec)
SO Data (Pri)
SO Data (Single)
where n is a port number in the range 0-7
The response to this command gives the partitioning
status of all four TP ports. If a port is disabled, reading
its partitioning status will indicate that it is connected. If
two eIMR+ devices are connected together, the second-
ary device indicates the status of all eight TP ports.
P7...P4 correspond to the four ports of the primary
device. P3..P0 correspond to the four ports of the sec-
ondary device.
Bit Rate Error Status of TP Ports
SI Data
SO Data (Sec)
SO Data (Pri)
SO Data (Single)
where n is a port number in the range 0-7.
The response to this command gives the bit-rate-over-
flow or underflow (data rate mismatch) condition of all
the TP ports. A 1 indicates that the FIFO has overflowed
or underflowed due to the amount of data received by
the corresponding port. If two eIMR+ devices are con-
nected together, the secondary device indicates the sta-
tus of all eight TP ports. E7...E4 correspond to the four
ports of the primary device. E3...E0 correspond to the
four ports of the secondary device.
Link Test Status of TP ports
SI Data
SO Data (Sec)
SO Data (Pri)
SO Data (Single)
where n is a port number in the range 0-7.
The response to this command gives the Link Test sta-
tus of all the TP ports. A disabled port continues to report
Link Test status. Re-enabling the port causes the port
to be placed in the Link Test Fail state. If two eIMR+
devices are connected together, the secondary device
indicates the status of all eight TP ports. L7..L4 corre-
spond to the four ports of the primary device. L3..L0
correspond to the four ports of the secondary device.
30
P n = 0
P n = 1
E n = 0
E n = 1
L n = 0
L n = 1
1000 0000
0000 P3..P0,
P7..P0 (output to HIMIB)
0000 P7..P4
0000 P3..P0
TP Port Partitioned
TP port Connected
1010 0000
0000 E3..E0,
E7..E0 (output to HIMIB)
0000 E7..E4
0000 E3..E0
No Error
FIFO Overflow
1101 0000
0000 L3..L0,
L7......L0 (output to HIMIB)
0000 L7..L4
0000 L3..L0
TP Port n in Link Test Failed
TP port n in Link Test Passed
P R E L I M I N A R Y
Am79C985
Receive Polarity Status of TP Ports
SI Data
SO Data (Sec)
SO Data (Pri)
SO Data (Single)
where n is a port number in the range 0-7
The response to this command gives the Received Po-
larity status of all the TP ports. If the polarity is detected
as reversed for a TP port, then the eIMR+ device will
set the appropriate bit in this command’s result only if
the Polarity Reversal Function is enabled for that port.
If two eIMR+ devices are connected together, the
secondary device indicates the status of all eight TP
ports. P7...P4 correspond to the four ports of the primary
device. P3..P0 correspond to the four ports of the sec-
ondary device.
MJLP Status
SI Data
SO Data (Sec)
SO Data (Pri)
SO Data (Single)
Each eIMR+ device contains an independent MAU Jab-
ber Lock Up Protection timer. The timer is designed to
inhibit the transmit function of the eIMR+ device if it has
been transmitting continuously for more than 65536 bit
times. This bit remains set and is only cleared when the
MJLP status is read using this command. If two eIMR+
devices are connected together, the secondary device
will indicate the status of both devices (M
of the primary device; M
device).
Version
SI Data
SO Data (Sec)
SO Data (Pri)
SO Data (Single)
The response to this command gives the version of the
eIMR+ device. 0011 was chosen to help distinguish the
eIMR+ device from the IMR (Am79C980) and the IMR+
(Am79C981) devices. If two eIMR+ devices are con-
nected together, the secondary device will indicate the
version of the primary device in the upper four bits of
the SO byte, and its own version number in the lower
four bits.
P n = 0
P n = 1
S
1110 0000
0000 P3......P0,
P7.....P0 (output to HIMIB)
0000 P7......P4
0000 P3......P0
TP Port n Polarity Correct
TP port n Polarity Reversed
1111 0000
M000 0000,
M
0000 M000
M000 0000
1111 1111
0000 0011,
0011
0000 0011
0000 0011
is the status of the secondary
P
000 M
P
0011
S
000 (to HIMIB)
S
(to HIMIB)
P
is the status