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ST5481 数据表(PDF) 2 Page - STMicroelectronics |
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ST5481 数据表(HTML) 2 Page - STMicroelectronics |
2 / 18 page ST5481 2/18 1 - GENERAL PURPOSE The ST5481 is a single chip ISDN -BRI with USB Interface low cost controller. The purpose is a low cost ISDN modem for applications like INTERNET ACCES and FAX capabilities when the PC is ON (full operating mode). The bonus is to offer an easy and lowcost access to INTERNET at a rate of 128kbits/sec. EASY access due to plug and play features via USB bus and lowcost due to host processing concept and remote powering via USB bus features. 2 - MAIN FUNCTIONS The device controls the S0 ISDN basic rate access (ITU normalization I430) and manages the B1, B2, D channels through the USB bus. B1, B2, D channels data flow is regulated through FIFO memories of respectively 32, 32, 16 bytes in each direction. On D, B1, B2 channels, all upper protocols than basic HDLC framing protocol are host processed from upper-datalink protocol (I440 normalization), network protocol up to applications drivers. Link Activation, deactivation protocols (I430) is managed by the device. But the full handling of the command and indicate primitives is done by the host processor accessing to dedicated registers. Call setup signalling frames through D channel are managed by the host processor. Internal regulators can be enabled to feed the device (and external devices) via the GNDBUS, VBUS USB powering lines. They convert the USB 5 volts to 3.3 volts. The device respects the USB release 1.0 power management recommendations. When entered in suspend mode on USB side the device drop into a low power mode. An internal oscillator and a PLL provide from an external 15.36MHz crystal a 48MHz clock for USB data rate recovering and 15.36MHz clock for S interface. The device offers one operating mode called CLOSED mode plus several test modes. In CLOSED MODE the device presents the USB interface, the S interface and 8 GPIO pins. 3 - PIN-OUT Figure 1 : Pin-out Synoptic 10 98 76 54 32 1 12 11 48 47 46 45 44 43 42 41 40 39 38 37 27 28 29 30 31 32 33 34 35 36 25 26 13 14 15 16 17 18 19 20 21 22 23 24 GPIO7 GPIO6 GPIO5 GPIO4 GNDD1 GPIO3 GPIO2 GPIO1 GPIO0 XTALIN XTALOUT FLTPLL LIP LIN IREF LON LOP TEST13 TEST12 NCS_TEST11 SDI_TEST10 CFG1_TEST9 SDO_TEST8 SCK_TEST7 ST5481 |
类似零件编号 - ST5481 |
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类似说明 - ST5481 |
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