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參數(shù)資料
| 型號： | AM79C982-4JC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | basic Integrated Multiport Repeater (bIMR) |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQCC84 |
| 封裝： | PLASTIC, LCC-84 |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 254K |
| 代理商： | AM79C982-4JC |
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AMD
PRELIMINARY
1–20
Am79C982
SET (Write) Opcodes
bIMR Chip Programmable Options
SI data: 0000 10SA
SO data:
None
bIMR Chip Programmable Options can be enabled (dis-
abled) by setting (resetting) the appropriate bit in the
command string. The two programmable bits are:
S—
AUI SQE Test Mask, and
A
—Alternative Port Activ-
ity Monitor (PAM) Function. These options can be en-
abled (disabled) by setting (resetting) the appropriate bit
in the command string.
S
—
AUI SQE Test Mask
Setting this bit allows the bIMR chip to ignore activity on
the CI signal pair, in the SQE Test Window, following a
transmission on the AUI port. This event occurs when
the attached MAU has the SQE Test option enabled,
therefore generating a burst of CI activity following every
transmission. This is interpreted by the bIMR device as
a collision, causing the bIMR device to generate a full
Jam pattern. Although the MAU attached to a repeater is
required not to have its SQE test function active, this is a
common installation error, causing difficulty in diagnos-
ing network throughput problems.
The SQE Test Window, as defined by the IEEE 802.3
(Section 7.2.2.2.4), is from 6-bit times to 34-bit times
(0.6
μ
s to 3.4
μ
s). This includes delay introduced by a
50 m AUI. CI activity that occurs outside this window is
not ignored and is treated as true collision.
Note that enabling this function does not prevent the re-
porting of this condition by the bIMR device and the two
functions operate independently.
A—Alternative Port Activity Monitor (PAM)
Function
Setting the Alternative Port Activity Monitor Function al-
lows the PAM function to be altered such that the Carrier
Sense data is presented unmodified. In default opera-
tion the PAM output (Carrier Sense bits in the CRS bit
stream) are masked if the port is either disabled or parti-
tioned. This does not allow the Repeater Management
software to sense activity on all segments at all times.
The ability to monitor partitioned or disabled ports allows
fault tolerance to be built into the Repeater Management
software.
Alternate AUI Port Partitioning Algorithm
SI data:
SO data:
The AUI port Partitioning/Reconnection scheme can be
programmed for the alternate (transmit only) reconnec-
tion algorithm by invoking this command. To return the
AUI back to the standard (transmit or receive) reconnec-
tion algorithm, it is necessary to reset the bIMR device.
Standard partitioning algorithm is selected upon reset.
00011111
None
Alternate TP Ports Partitioning Algorithm
SI data:
SO data:
The TP ports Partitioning/Reconnection scheme can be
programmed for the alternate (transmit only) reconnec-
tion algorithm by invoking this command. All TP ports
are affected as a group by this command. To return the
TP ports back to the standard (transmit or receive) re-
connection algorithm, it is necessary to reset the bIMR
device. The standard partitioning algorithm is selected
upon reset.
00010000
None
AUI Port Disable
SI data:
SO data:
00101111
None
The AUI port will be disabled upon receiving this com-
mand. Subsequently, the bIMR chip will ignore all inputs
(Carrier Sense and SQE) appearing at the AUI port and
will not transmit any data or Jam Sequence on the AUI
port. Issuing this command will also cause the AUI port
to have its internal partitioning state machine forced to
its idle state. Therefore, a Partitioned Port may be re-
connected by first disabling and then re-enabling
the port.
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