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参数资料
| 型号： | DP83848HSQ/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 9/82页 |
| 文件大小： | 0K |
| 描述： | IC TXRX ETHERNET PHYTER 40-LLP |
| 产品培训模块： | PHYTER® Family |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | 以太网 |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-LLP-EP（6x6） |
| 包装： | 剪切带 (CT) |
| 配用： | DP83848H-MAU-EK-ND - BOARD EVALUATION DP83848H |
| 其它名称： | *DP83848HSQ/NOPB DP83848HSQCT |
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2.1.3 Auto-Negotiation Parallel Detection
The DP83848H supports the Parallel Detection function as
defined in the IEEE 802.3u specification. Parallel Detection
requires both the 10 Mb/s and 100 Mb/s receivers to moni-
tor the receive signal and report link status to the Auto-
Negotiation function. Auto-Negotiation uses this informa-
tion to configure the correct technology in the event that the
Link Partner does not support Auto-Negotiation but is
transmitting link signals that the 100BASE-TX or 10BASE-
T PMAs recognize as valid link signals.
If the DP83848H completes Auto-Negotiation as a result of
Parallel Detection, bit 5 or bit 7 within the ANLPAR register
will be set to reflect the mode of operation present in the
Link Partner. Note that bits 4:0 of the ANLPAR will also be
set to 00001 based on a successful parallel detection to
indicate a valid 802.3 selector field. Software may deter-
mine that negotiation completed via Parallel Detection by
reading a zero in the Link Partner Auto-Negotiation Able bit
once the Auto-Negotiation Complete bit is set. If configured
for parallel detect mode and any condition other than a sin-
gle good link occurs then the parallel detect fault bit will be
set.
2.1.4 Auto-Negotiation Restart
Once Auto-Negotiation has completed, it may be restarted
at any time by setting bit 9 (Restart Auto-Negotiation) of the
BMCR to one. If the mode configured by a successful Auto-
Negotiation loses a valid link, then the Auto-Negotiation
process will resume and attempt to determine the configu-
ration for the link. This function ensures that a valid config-
uration is maintained if the cable becomes disconnected.
A renegotiation request from any entity, such as a manage-
ment agent, will cause the DP83848H to halt any transmit
data and link pulse activity until the break_link_timer
expires (~1500 ms). Consequently, the Link Partner will go
into link fail and normal Auto-Negotiation resumes. The
DP83848H
will
resume Auto-Negotiation after
the
break_link_timer has expired by issuing FLP (Fast Link
Pulse) bursts.
2.1.5 Enabling Auto-Negotiation via Software
It is important to note that if the DP83848H has been initial-
ized upon power-up as a non-auto-negotiating device
(forced technology), and it is then required that Auto-Nego-
tiation or re-Auto-Negotiation be initiated via software,
bit 12 (Auto-Negotiation Enable) of the Basic Mode Control
Register (BMCR) must first be cleared and then set for any
Auto-Negotiation function to take effect.
2.1.6 Auto-Negotiation Complete Time
Parallel detection and Auto-Negotiation take approximately
2-3 seconds to complete. In addition, Auto-Negotiation with
next page should take approximately 2-3 seconds to com-
plete, depending on the number of next pages sent.
Refer to Clause 28 of the IEEE 802.3u standard for a full
description of the individual timers related to Auto-Negotia-
tion.
2.2 Auto-MDIX
When enabled, this function utilizes Auto-Negotiation to
determine the proper configuration for transmission and
reception of data and subsequently selects the appropriate
MDI pair for MDI/MDIX operation. The function uses a ran-
dom seed to control switching of the crossover circuitry.
This implementation complies with the corresponding IEEE
802.3 Auto-Negotiation and Crossover Specifications.
Auto-MDIX is enabled by default and can be configured via
strap or via PHYCR (0x19h) register, bits [15:14].
Neither Auto-Negotiation nor Auto-MDIX is required to be
enabled in forcing crossover of the MDI pairs. Forced
crossover can be achieved through the FORCE_MDIX bit,
bit 14 of PHYCR (0x19h) register.
Note: Auto-MDIX will not work in a forced mode of opera-
tion.
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| DP83848I | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Industrial Temperature Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver |
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| DP83848I-POE-EK | 功能描述:以太网开发工具 DP83848 POE CARD IND TEMP RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
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