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FW804-09-DB Fiches technique(PDF) 9 Page - Agere Systems |
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FW804-09-DB Fiches technique(HTML) 9 Page - Agere Systems |
9 / 24 page Agere Systems Inc. 9 Data Sheet, Rev. 3 June 2001 Four-Cable Transceiver/Arbiter Device FW804 PHY IEEE 1394A 43 TPB0+ Analog I/O Portn, Port Cable Pair B. TPBn is the port B connection to the twisted- pair cable. Board traces from each pair of positive and negative differen- tial signal pins should be kept matched and as short as possible to the external load resistors and to the cable connector. 50 TPB1+ 56 TPB2+ 37 TPB3+ 42 TPB0 − Analog I/O Portn, Port Cable Pair B. TPBn is the port B connection to the twisted- pair cable. Board traces from each pair of positive and negative differen- tial signal pins should be kept matched and as short as possible to the external load resistors and to the cable connector. 49 TPB1 − 55 TPB2 − 36 TPB3– 46 TPBIAS0 Analog I/O Portn, Twisted-Pair Bias. TPBIAS provides the 1.86 V nominal bias voltage needed for proper operation of the twisted-pair cable drivers and receivers and for sending a valid cable connection signal to the remote nodes. 53 TPBIAS1 59 TPBIAS2 40 TPBIAS3 6, 29, 30, 68, 69, 79 VDD — Digital Power. VDD supplies power to the digital portion of the device. 34, 35, 47, 48, 54, 62, 63 VDDA — Analog Circuit Power. VDDA supplies power to the analog portion of the device. 3, 16, 20, 21, 28, 70, 80 VSS — Digital Ground. All VSS signals should be tied to the low-impedance ground plane. 41, 60, 61, 64, 65 VSSA — Analog Circuit Ground. All VSSA signals should be tied together to a low-impedance ground plane. 76 XI — Crystal Oscillator. XI and XO connect to a 24.576 MHz parallel reso- nant fundamental mode crystal. Although, when a 24.576 MHz clock source is used, it can be connected to XI with XO left unconnected. The optimum values for the external shunt capacitors are dependent on the specifications of the crystal used. It is suggested that two 12 pF shunt capacitors be used for a crystal with a specified 7 pF loading capaci- tance. For more details, see Crystal Selection Considerations in Applica- tion Information section. 77 XO Signal Information (continued) Table 1. Signal Descriptions (continued) Pin Signal* Type Name/Description * Active-low signals are indicated by “/” at the beginning of signal names, within this document. |
Numéro de pièce similaire - FW804-09-DB |
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Description similaire - FW804-09-DB |
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