AM79C985JC datasheet(30/48 Pages) AMD

30 / 48 page

Am79C985

PRELIMINARY

TP Port Partitioning Status

SI Data

1000 0000

SO Data (Sec)

0000 P3..P0,

P7..P0 (output to HIMIB)

SO Data (Pri)

0000 P7..P4

SO Data (Single)

0000 P3..P0

n = 0

TP Port Partitioned

n = 1

TP port Connected

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

1010 0000

SO Data (Sec)

0000 E3..E0,

E7..E0 (output to HIMIB)

SO Data (Pri)

0000 E7..E4

SO Data (Single)

0000 E3..E0

n = 0

No Error

n = 1

FIFO Overﬂow

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

1101 0000

SO Data (Sec)

0000 L3..L0,

L7......L0 (output to HIMIB)

SO Data (Pri)

0000 L7..L4

SO Data (Single)

0000 L3..L0

n = 0

TP Port n in Link Test Failed

n = 1

TP port n in Link Test Passed

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.

Receive Polarity Status of TP Ports

SI Data

1110 0000

SO Data (Sec)

0000 P3......P0,

P7.....P0 (output to HIMIB)

SO Data (Pri)

0000 P7......P4

SO Data (Single)

0000 P3......P0

n = 0

TP Port n Polarity Correct

n = 1

TP port n Polarity Reversed

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

1111 0000

SO Data (Sec)

M000 0000,

MP000 MS000 (to HIMIB)

SO Data (Pri)

0000 M000

SO Data (Single)

M000 0000

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 (MP is the status

of the primary device; MS is the status of the secondary

device).

Version

SI Data

1111 1111

SO Data (Sec)

0000 0011,

0011P 0011S (to HIMIB)

SO Data (Pri)

0000 0011

SO Data (Single)

0000 0011

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.

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