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參數(shù)資料
| 型號： | UPD72870GM-8ED |
| 廠商： | NEC Corp. |
| 英文描述： | IEEE1394 1-CHIP OHCI HOST CONTROLLER |
| 中文描述： | IEEE1394連接1 - OHCI主機控制器芯片 |
| 文件頁數(shù)： | 35/48頁 |
| 文件大?。?/td> | 337K |
| 代理商： | UPD72870GM-8ED |
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Preliminary Data Sheet S13925EJ2V0DS00
35
μ
PD72870,72871
4.1.2 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
Note
, 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 1394 bus is transmitted to the state machine in the LSI.
Note
The SCLK is a PHY/Link interface signal and is defined in P1394a draft 2.0. It is an internal signal in the
μ
PD72870,72871.
4.1.3 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 that the power has failed.
4.1.4 Unused Ports
TpAp, TpAn : Not connected
TpBp, TpBn : AGND
TpBias : Connected to AGND using a 1.0
μ
F load capacitor
4.2 PLL and Crystal Oscillation Circuit
4.2.1 Crystal Oscillation Circuit
To supply the clock of 24.576 MHz ± 100 ppm, use an external capacitor of 10 pF and a crystal of 50 ppm.
4.2.2 PLL
The crystal oscillator multiplies the 24.576 MHz frequency by 16 (393.216 MHz).
4.3 PC0-PC2, CMC
CMC shows the bus manager function which corresponds to the c bit of the Self_ID packet and the Contender bit
in the PHY register when the input is High.
The value of CMC can be changed with software through the Link layer; this pin sets the initial value during Power-
on Reset. Use a pull-up or pull-down resistor of 10 k
, based on the device’s specification.
The PC0-PC2 pin corresponds to the power field of the Self_ID packet and Pwr_class in the PHY register. Refer to
Section 4.3.4.1 of the IEEE1394-1995 specification for information regarding the Pwr_class. The value of Pwr can be
changed with software through the Link layer; this pin sets the initial value during Power-on Reset. Use a pull-up or
pull-down resistor of 10 k
based on the application.
4.4 P_RESETB
Connect an external capacitor of 0.1
μ
F between the pins P_RESETB and GND. If the voltage drops below 0 V, a
reset pulse is generated. All of the circuits are initialized, including the contents of the PHY register.
4.5 RI0, RI1
Connect an external resistor of 9.1 k
to limit the LSI’s current.
#
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