參數(shù)資料
型號(hào)： UPD72850A
廠商： NEC Corp.
英文描述： IEEE1394 400Mbps PHY
中文描述： IEEE1394連接400Mbps的物理層
文件頁(yè)數(shù)： 19/48頁(yè)
文件大?。?/td> 290K
代理商： UPD72850A
Data Sheet S14452EJ1V0DS00
19
μ
PD72850A
3.2.2 Cable Interface Circuit
Each port is configured with two twisted-pairs of TpA and TpB.
TpA and TpB are used to monitor the state of the Transmit/Receive line, control signals, data and cables.
During transmission to the IEEE1394 bus, the Data/Strobe signal received from the Link layer controller is
encoded, converted from parallel to serial and transmitted.
While receiving from the IEEE1394 bus, the Data/Strobe signal from TpA, TpB is converted from serial to parallel
after synchronization by SCLK, then transmitted to the Link layer controller in 2/4/8 bits according to the data rate of
100/200/400 Mbps.
The bus arbitration for TpA and TpB and the state of the line are monitored by the built-in comparator. The state of
the IEEE1394 bus is transmitted to the state machine in the LSI.
3.2.3 Unused Ports
TpAp, TpAn : Not connected
TpBp, TpBn : AGND
TpBias : Connected to AGND using a 1.0
μ
F load capacitor
3.2.4 CPS
An external resistance of 390 k
is connected in series to the power cable to monitor the power of the power
cable. If the cable power falls under 7.5 V there is an indication to the Link layer controller that the power has failed.
3.3 Suspend/Resume
3.3.1 Suspend/Resume On Mode (SUS/RES = “H”)
There are two ways of transition from the active status to the suspended status.
One is when the receipt of a remote command packet that sets the initiate suspend command. After that, the PHY
transmits a remote confirmation packet with the ok bit set, subsequently signals TX_SUSPEND to the connected
peer PHY with the port which specified by the port field in the remote command packet, and then the PHY port
transitions to the suspended state.
The other is when the receipt of a RX_SUSPEND or RX_DISABLE_NOTIFY signal. When the port observes
RX_SUSPEND, it transmits TX_SUSPEND to the active ports.
The TX_SUSPEND transmitted propagates until it reaches a leaf node. The PHY port transitions to the suspended
state. The propagation of the suspended domain may be blocked by a PHY compliant with IEEE Std 1394-1995, a
disabled or a suspended port.
Any one of a number of reasons may cause a suspended port to attempt to resume normal operations:
Bias is detected and there is no fault condition;
A resume packet is received or transmitted by the PHY;
A remote command packet that sets the resume port command is received; or
Either port of a node without active ports detects bias.
3.3.2 Suspend/Resume Off Mode (SUS/RES = “L”)
Remote command packet is ignored.
Resume packet is ignored.
Disabled, Int_enable and resume_int bits in PHY register are ignored.
Responses to Remote access packet.
Detects the connection of the port in TpBias.
相關(guān)PDF資料
PDF描述
UPD72850AGK-9EU Circular Connector; No. of Contacts:56; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:25-4 RoHS Compliant: No
uPD750066CU 4-BIT SINGLE-CHIP MICROCONTROLLERS
uPD750068GT 4-BIT SINGLE-CHIP MICROCONTROLLERS
uPD750068GTA 4-BIT SINGLE-CHIP MICROCONTROLLERS
uPD750066GTA CONNECTOR ACCESSORY
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD74HC04C 制造商:Panasonic Industrial Company 功能描述:IC
UPD750068GT-396 制造商:Renesas Electronics Corporation 功能描述:
UPD7507C189 制造商:Panasonic Industrial Company 功能描述:IC
UPD7508CU265 制造商:Panasonic Industrial Company 功能描述:IC
UPD75208 制造商:Panasonic Industrial Company 功能描述:IC
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*