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ST5481 数据表(PDF) 10 Page - STMicroelectronics |
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ST5481 数据表(HTML) 10 Page - STMicroelectronics |
10 / 18 page ST5481 10/18 If Pin CFG1 is 1, when reset (PON,USB,PIN) is active the initial state is INACTIVE. 9 - ENDPOINTS CONFIGURATION AND DEDICATION These endpoints are organized as one interface (interface 0), one configuration (configuration 1). The interface being composed of four alternate settings. Hereafter in the document RX data direction is from S line to PC and is considered as IN by USB protocol. The endpoints are: – 4 isochronous endpoints for B1 and B2 channels (fifo 32 bytes in each direction) • EP3 input endpoint for B1 channel IN(RX) on S line - associated to IN(RX) fifo 32 bytes • EP2 output endpoint for B1 channel OUT(TX) on S line - associated to OUT(TX) fifo 32 bytes • EP5 input endpoint for B2 channel IN(RX) on S line - associated to IN(RX) fifo 32 bytes • EP4 output endpoint for B2 channel OUT(TX) on S line - associated to OUT(TX) fifo 32 bytes – 2 isochronous endpoints for D channels (fifo 16 bytes in each direction) • EP7 input endpoint for D channel IN(RX) on S line - associated to IN(RX) fifo 16 bytes • EP6 output endpoint for D channel OUT(TX) on S line - associated to OUT(TX) fifo 16 bytes – 1 control endpoint means management of USB standards, Communication Device Class (CDC) standards (unused), and vendor requests (S in- terface application dedicated): • EP0 - internal configuration and control registers - D, B1, B2 channels transmit commands - CI primitives to be transmitted – 1 interrupt endpoint used for vendor interrupts • EP1 - channels reception or transmission indications - CI primitives in receive direction - D, B1, B2 channel reception indications - S line status - GPIO input changes The alternate settings are: • Alternate setting 0: EP0, EP1. - initialisation configuration • Alternate setting 1: EP0, EP1, EP2, EP3, P6, EP7 - connection 64Kbits through B1 channel • Alternate setting 2: EP0, EP1, EP4, EP5, EP6, EP7 - connection 64Kbits through B2 channel • Alternate setting 3: EP0, EP1, EP2, EP3, EP4, EP5, EP6, EP7 - connection 128Kbps (144Kbits/sec) through B1 + B2 + (data into D) channels Figure 7 : S Interface States - CFG1=1 OFF PON RESET / USB REQUEST/ PIN RESET M3 M2 STT(5)=0 STT(5)=1 PDN or PDWN=1 PUP or NLSD=0 STT(5)=1 M1 OFF S LINE ACTIVATION NOT POSSIBLE ACTIVE INACTIVE S LINE ACTIVATION POSSIBLE |
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类似说明 - ST5481 |
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