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Intel® PXA255 Processor Developer’s Manual ix
Contents
11.2 FICP Operation................................................................................................................11-1
11.2.1 4PPM Modulation ...............................................................................................11-2
11.2.2 Frame Format.....................................................................................................11-3
11.2.3 Address Field......................................................................................................11-3
11.2.4 Control Field .......................................................................................................11-3
11.2.5 Data Field ...........................................................................................................11-3
11.2.6 CRC Field ...........................................................................................................11-4
11.2.7 Baud Rate Generation........................................................................................11-4
11.2.8 Receive Operation..............................................................................................11-4
11.2.9 Transmit Operation.............................................................................................11-5
11.2.10 Transmit and Receive FIFOs..............................................................................11-6
11.2.11 Trailing or Error Bytes in the Receive FIFO........................................................11-7
11.3 FICP Register Definitions ................................................................................................11-7
11.3.1 FICP Control Register 0 (ICCR0)........................................................................11-8
11.3.2 FICP Control Register 1 (ICCR1)......................................................................11-10
11.3.3 FICP Control Register 2 (ICCR2)......................................................................11-11
11.3.4 FICP Data Register (ICDR)...............................................................................11-12
11.3.5 FICP Status Register 0 (ICSR0).......................................................................11-13
11.3.6 FICP Status Register 1 (ICSR1).......................................................................11-15
11.4 FICP Register Summary................................................................................................11-16
12 USB Device Controller................................................................................................................12-1
12.1 USB Overview .................................................................................................................12-1
12.2 Device Configuration .......................................................................................................12-2
12.3 USB Protocol ...................................................................................................................12-2
12.3.1 Signalling Levels.................................................................................................12-3
12.3.2 Bit Encoding........................................................................................................12-3
12.3.3 Field Formats......................................................................................................12-4
12.3.4 Packet Formats...................................................................................................12-5
12.3.5 Transaction Formats...........................................................................................12-6
12.3.6 UDC Device Requests........................................................................................12-8
12.3.7 Configuration ......................................................................................................12-9
12.4 UDC Hardware Connection ...........................................................................................12-10
12.4.1 Self-Powered Device ........................................................................................12-10
12.4.2 Bus-Powered Devices ......................................................................................12-12
12.5 UDC Operation ..............................................................................................................12-12
12.5.1 Case 1: EP0 Control Read ...............................................................................12-12
12.5.2 Case 2: EP0 Control Read with a Premature Status Stage..............................12-13
12.5.3 Case 3: EP0 Control Write With or Without a Premature Status
Stage ................................................................................................................12-14
12.5.4 Case 4: EP0 No Data Command......................................................................12-15
12.5.5 Case 5: EP1 Data Transmit (BULK-IN).............................................................12-15
12.5.6 Case 6: EP2 Data Receive (BULK-OUT)..........................................................12-16
12.5.7 Case 7: EP3 Data Transmit (ISOCHRONOUS-IN)...........................................12-17
12.5.8 Case 8: EP4 Data Receive (ISOCHRONOUS-OUT)........................................12-18
12.5.9 Case 9: EP5 Data Transmit (INTERRUPT-IN) .................................................12-20
12.5.10 Case 10: RESET Interrupt................................................................................12-20
12.5.11 Case 11: SUSPEND Interrupt...........................................................................12-21
12.5.12 Case 12: RESUME Interrupt.............................................................................12-21
12.6 UDC Register Definitions...............................................................................................12-21