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| 型號(hào)： | LAN9116 |
| 廠(chǎng)商： | SMSC Corporation |
| 英文描述： | Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller |
| 中文描述： | 高效的單芯片10/100非PCI以太網(wǎng)控制器 |
| 文件頁(yè)數(shù)： | 64/126頁(yè) |
| 文件大?。?/td> | 831K |
| 代理商： | LAN9116 |
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Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
Revision 1.1 (05-17-05)
64
SMSC LAN9116
DATASHEET
abilities will be advertised. Auto-negotiation can also be disabled via software by clearing register 0,
bit 12.
The LAN9116 does not support “Next Page" capability.
4.7
Parallel Detection
If the LAN9116 is connected to a device lacking the ability to auto-negotiate (i.e. no FLPs are
detected), it is able to determine the speed of the link based on either 100M MLT-3 symbols or 10M
Normal Link Pulses. In this case the link is presumed to be half-duplex per the IEEE standard. This
ability is known as “Parallel Detection. This feature ensures inter operability with legacy link partners.
If a link is formed via parallel detection, then bit 0 in register 6 is cleared to indicate that the Link
Partner is not capable of auto-negotiation. The Ethernet MAC has access to this information via the
management interface. If a fault occurs during parallel detection, bit 4 of register 6 is set.
Register 5 is used to store the Link Partner Ability information, which is coded in the received FLPs.
If the Link Partner is not auto-negotiation capable, then register 5 is updated after completion of parallel
detection to reflect the speed capability of the Link Partner.
4.7.1
Re-starting Auto-negotiation
Auto-negotiation can be re-started at any time by setting register 0, bit 9. Auto-negotiation will also re-
start if the link is broken at any time. A broken link is caused by signal loss. This may occur because
of a cable break, or because of an interruption in the signal transmitted by the Link Partner. Auto-
negotiation resumes in an attempt to determine the new link configuration.
If the management entity re-starts Auto-negotiation by writing to bit 9 of the control register, the
LAN9116 will respond by stopping all transmission/receiving operations. Once the break_link_timer is
done, in the Auto-negotiation state-machine (approximately 1200ms) the auto-negotiation will re-start.
The Link Partner will have also dropped the link due to lack of a received signal, so it too will resume
auto-negotiation.
4.7.2
Disabling Auto-negotiation
Auto-negotiation can be disabled by setting register 0, bit 12 to zero. The device will then force its
speed of operation to reflect the information in register 0, bit 13 (speed) and register 0, bit 8 (duplex).
The speed and duplex bits in register 0 should be ignored when auto-negotiation is enabled.
4.7.3
Half vs. Full-Duplex
half-duplex operation relies on the CSMA/CD (Carrier Sense Multiple Access / Collision Detect)
protocol to handle network traffic and collisions. In this mode, the carrier sense signal, CRS, responds
to both transmit and receive activity. In this mode, If data is received while the PHY is transmitting,
a collision results.
In full-duplex mode, the PHY is able to transmit and receive data simultaneously. In this mode, CRS
responds only to receive activity. The CSMA/CD protocol does not apply and collision detection is
disabled.
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| LAN9116-MD | 功能描述:以太網(wǎng) IC Efficient Sngl Chip 10/100 Ethrnt RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| LAN9116-MT | 功能描述:以太網(wǎng) IC Ethernet IC 32bit Superior Perf RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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