參數(shù)資料
型號(hào)： AM79C988
廠商： Advanced Micro Devices, Inc.
英文描述： Quad Integrated Ethernet Transceiver (QuIET⑩)
中文描述： 四路集成以太網(wǎng)收發(fā)器（安靜⑩）
文件頁(yè)數(shù)： 10/25頁(yè)
文件大?。?/td> 184K
代理商： AM79C988
10
Am79C988A
P R E L I M I N A R Y
Link Status
B
0
B
1
B
2
B
3
The QuIET device reports the Link Status of each port.
If Link Test is disabled, Link Status indicates a Link Pass.
B
n
0
1
Link Fail
Link Pass
Receive Polarity Status
C
0
C
1
C
2
C
3
The QuIET device reports the polarity status of each port.
C
n
0
1
Reversed Polarity
True Polarity
Jabber Condition
D
0
D
1
D
2
D
3
The QuIET device reports the Jabber Condition status
for each port. Jabber is defined as continuous transmis-
sions by a port for more than 30 ms.
D
n
0
1
No Jabber
Jabber
Management Commands
When DIR switches from LOW to HIGH, the QuIET de-
vice reads the command sequence over SDATA. Each
management command character is held for 2-bit times
(200 ns). The command format is as follows.
Management Command Format
0E
0
E
1
E
2
E
3
F
0
F
1
F
2
F
3
G
0
G
1
G
2
G
3
H
0
H
1
H
2
H
3
I J
0
J
1
J
2
J
3
KSSSSSSS
Note
: The QuIET device requires DIR to be high for a
minimum of 29 data bits (one bit is four MCLKs), which
automatically occurs with the IMR2 device. If any other
type of controller is used, DIR must still be high at least
29-bit times. After I, SDATA can be all ones.
Extended Distance Option
E
0
E
1
E
2
E
3
This command modifies the RXD circuit of the trans-
ceiver to accommodate signal-attenuation lines longer
than 100 meters.
E
n
0 Disable Extended Distance Option
1 Enable Extended Distance Option
Link Test Enable
F
0
F
1
F
2
F
3
This command enables the corresponding port to per-
form a Link Test. Link Status will report Link Pass if the
Link Test is disabled.
F
n
0
1
Disable Link Test
Enable Link Test
Transmit Link Pulse Enable
G
0
G
1
G
2
G
3
This command enables the corresponding port to trans-
mit a Link Pulse. The pulse will be transmitted if either
a packet or a pulse has not been transmitted for 16 ms.
Note that Link Pulses are transmitted when ports are in
Link Test Fail.
G
n
0
1
Disable Link Pulse Transmit
Enable Link Pulse Transmit
Auto Polarity Correction Enable
H
0
H
1
H
2
H
3
This command allows the QuIET device to detect and
correct the polarity of signals at RXD.
H
n
0
1
Enable Auto Polarity
Disable Auto Polarity
Loopback Test Enable
This command enables or disables the loopback test
for the twisted pair ports. When enabled, the signal on
RXD is retransmitted on TXD. The default condition is
loopback test disabled. Note that the TXD drivers have
on-chip filtering, which may cause the TXD output to
be different from the corresponding RXD input during
this test.
I
0
1
Enable Loopback Test
Disable Loopback Test
Transceiver Mode Selection
J
0
J
1
J
2
J
3
This command sets the QuIET device either in Full-Du-
plex or Normal mode. The default is Normal mode.
J
n
0
1
Full Duplex
Normal
E
n
Extended Distance
0 Disabled
1 Enabled
F
n
Link Test
0 Disabled
1 Enabled
G
n
Transmit Link Test Pulses
0 Disabled
1 Enabled
H
n
Enable Polarity Correc-
tion
0 Enabled
1 Disabled
I
Loopback Test (All Ports)
0 Enabled
1 Disabled
J
n
Transceiver Mode
0 Full Duplex
1 Normal (Default
condition - IMR2 only
supports Normal)
K
CMOS/PAUI Mode
0 CMOS Mode
1 PAUI Mode
S
Not used
Logic HIGH
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