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26
Am79C989
P R E L I M I N A R Y
Control Register (Reg 18)
The Control Register (Reg 18) configures the port in
conjunction with the Auto-Negotiation registers. The
Control Register contains Read/Write (R/W) or Read/
Only (R/O) bits. This register is duplicated for each
port.
Table 18.
Control Register (Reg 18)
Bit(s)
Name
Description
Read/
Write
Default/
Reset
15
Force Link Good
Enable
1 = 10BASE-T link integrity state machine is forced to the “l(fā)ink
good” state;
0 = Normal operation resumes.
For internal test only (when link pulses are absent).
Not for general use in 10BASE-T applications.
R/W
0
14:6
Reserved
Written and read as zero.
R/O
0
5
Interrupt Enable
1 = For port 0, the Interrupt function through the QINT/CI- pin will
be active and the AUI port, if selected (bit 2 set), will operate in PCI
mode.
0 = For port 0, the interrupt function will not be available.
Ports 1, 2, and 3 are don’t cares.
Not effected by SRESET.
R/W
1
4
Disable
Link Pulse
Generation
1 = Link pulses sent from the 10BASE-T transmitter are
suppressed;
0 = Link Pulses not suppressed.
R/W
0
3
Auto Receive
Polarity Correction
Disable
1 = Polarity correction circuit at the front-end of the receive port
disabled (when the receive function is disabled, the receive port will
only accept frames with correct polarity);
0 = Self-correcting polarity circuit will be enabled at the receive
interface of the device.
R/W
0
2
AUI Select
Enable
1 = For port 0, Attachment Unit Interface is substituted for
10BASE-T port 0;
0 = Port 0 reverts to 10BASE-T function.
Ports 1, 2, and 3 are don’t cares. Not effected by SRESET.
R/W
0
1
Extended Distance
Enable
1 = 10BASE-T receive squelch thresholds reduced for reception of
frames farther than 100 meters.
0 = Squelch thresholds at standard 100 meter distance.
R/W
0
0
SQE_TEST
Disable
1 = SQE heartbeat, which occurs after each transmission, disabled;
0 = Heartbeat asserted on QCLSN approximately 1
μ
s after
transmission, for a duration of 1
μ
s;
When the port is configured for full duplex, heartbeat signal is
automatically disabled.
R/W
0
相關PDF資料 |
PDF描述 |
|---|---|
| AM79C989JC | Quad Ethernet Switching Transceiver (QuEST⑩) |
| AM79C989JCT | Quad Ethernet Switching Transceiver (QuEST⑩) |
| AM79C98 | Twisted-Pair Ethernet Transceiver (TPEX) |
| AM79C98JC | Twisted-Pair Ethernet Transceiver (TPEX) |
| AM79C98PC | Twisted-Pair Ethernet Transceiver (TPEX) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AM79C989JC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C989JC/T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C989JCT | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Quad Ethernet Switching Transceiver (QuEST⑩) |
| AM79C98JC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Twisted-Pair Ethernet Transceiver (TPEX) |
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