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參數(shù)資料
| 型號： | UPD72852 |
| 廠商： | NEC Corp. |
| 英文描述： | MOS INTEGRATED CIRCUIT |
| 中文描述： | 馬鞍山集成電路 |
| 文件頁數(shù)： | 18/48頁 |
| 文件大小： | 249K |
| 代理商： | UPD72852 |
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Data Sheet S14920EJ3V0DS
18
μ
PD72852
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 : GND
TpBias : Not connected
3.2.4 CPS
Connect an external resistor of 390 k
between the CPS pin and the power cable, and an external resistor of 100
k
between the CPS pin and GND 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 IEEE1394a-2000, 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.
Output the 1.85 V voltage of the port in TpBias.
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