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參數(shù)資料
| 型號： | 83C795 |
| 廠商： | SMSC Corporation |
| 英文描述： | Ethernet System Controller |
| 中文描述： | 以太網(wǎng)系統(tǒng)控制器 |
| 文件頁數(shù)： | 88/136頁 |
| 文件大小： | 1996K |
| 代理商： | 83C795 |
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7.5.6
Each TP driver transmits a short positive pulse
periodically when it is not sending data. These
pulses are received at the other end of the twisted
pair cable, signaling that the link is operating
correctly. The time between link test pulses is
compared to the expected range at the receiver to
help ignore noise pulses. If the link test fails (no
pulses or data received within a fixed time period)
then the LLED pin is set high and AUI interface is
selected. If the link is restored, the chip
automatically selects TP interface.
Link Integrity Test Function
The Link Integrity Test is also used to correct the
receiver connection’s polarity. The Link Integrity
Test signal and Start-of-Idle both have positive
polarity. The polarity correction state machine looks
at both of these to determine whether to flip receiver
polarity. Polarity correction can be disabled by a bit
in the MANCH Register (MANCH.ENAPOL).
The Link Integrity Test can be disabled by a bit in
the General Control Register (GCR.LIT). Disabling
Link Test forces the 83C795 to select the
twisted-pair interface.
7.5.7
If the internal transmit enable signal is active for
more than 46 msec, the twisted-pair transmitter will
be disabled and a collision indication is sent to the
MAC transmitter circuit. When the internal transmit
enable signal has been inactive for more than 368
msec, the internal collision indicator will become
inactive and the twisted-pair transmitter will be
re-enabled. J abber protection for the AUI port is
provided by an external MAU.
Jabber Protection
7.5.8
In twisted-pair operation, a brief internal collision
indication will be sent to the MAC transmitter after
each packet is transmitted. When an AUI port is in
use, an external MAU will provide this signal.
SQE Test (Heartbeat Test)
7.5.9
To assist in installation and management of the
network, indicator LEDs can be driven directly by
four outputs from the 83C795. These show the
result of Link Test, polarity check, transmit and
receive activity. The LED outputs can be read back
through the MANCH register to support network
management functions.
Status Indications
83C795
Elliptic
10Filter
Jack
TPX2+
TPX1+
R
2
R
6
R
6
R
2
TPX1-
TPX2-
R31 || R32 = 50 Ohm = R33 || R34
Ratio of R31 to R32 determines how much smaller the
second half of the pulse is than the first half
1
1
0
0
1
0
1
PTPX1
TPX2
+
+
+
+
+
-
-
-
-
-
-
-
+
+
+
-
-
+
-
+
+
+
-
-
+
+
FIGURE 7-3. SIMPLIFIED TRANSMIT CIRCUITRY
LAN CONTROLLER OVERVIEW
83C795
75
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