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ST5481 Datasheet(PDF) 6 Page - STMicroelectronics |
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ST5481 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 18 page ST5481 6/18 5 - ISDN ACCESS The device is directly connected to the ISDN line at S0 interface point. 4 pins are dedicated to this access: LIP, LIN: receive AMI differential signals inputs connected to the appropriate transformer LOP, LON: transmit AMI differential signals outputs connected to the appropriate transformer. The S interface access sub-function is clock- feeded by a 15.36MHz clock signal from the on-chip oscillator. I431 recommendation protocols are fully imple- mented. The activation / deactivation command manage- ment is done by the device. 5.1 - ISDN S Interface Synoptic See Figure 3. 6 - USB ACCESS The device is directly connected to the USB bus. 4 pins are dedicated to this access: DP, DM for data exchange. VBUS, GNDBUS as power lines. The data transfer rate is 12 MBits. The clock is extracted from the differential lines DP, DM by a digital PLL from a 48MHz internal clock. This 48MHz clock is created from the 15.36MHz clock. The USB protocol is fully implemented following the 1.0 USB specification. 6.1 - USB Normalization This specification refers to USB normalization documents: – Universal Serial Bus Specification revision 1.0 – Universal Serial Bus Common Class Specifica- tion revision 1.0 – ST5481 belongs to the VENDOR SPECIFIC DEVICE CLASS and to a vendor specific subclass defined as ISDN MODEM DEVICE SUBCLASS. It presents ONE INTERFACE belonging to the VENDOR SPECIFIC INTERFACE CLASS and a vendor specific interface subclass defined as ISDN SOFT MODEM INTERFACE SUBCLASS. It satisfies to a vendor specific control protocol called ISDN SOFT MODEM PROTOCOL. Figure 3 : S-Interface Block Diagram Line Signal Rx Slicers RXNUM CONTROL TXNUM - Tx multiframe control - D channel monitoring - Loopbacks - Frame construction - AMI code generation Detector - C/I control - Activation state machine - Master clocks generation - D & E channel processing - Auto threshold controller - Auto equalizer controller - Digital PLL, line synchronization - AMI decoder - Frame synchronization & polarity check - Signal ID - Multiframe control. Pre Filter & equalizer 2x6 bits DACs Line Driver |
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