
Universal Serial Bus Interface – On-The-Go Module
21-66
Freescale Semiconductor
NOTE
For TX-ISO, MULT counter can be loaded with a lesser value in the dTD
multiplier override field. If the multiplier override field is zero, the MULT
counter initializes to the multiplier in the QH.
•
RX packet retired:
— MULT counter reaches zero.
— Non-MDATA data PID is received
— Overflow error:
– Packet received is > maximum packet length. (Buffer Error bit is set)
– Packet received exceeds total bytes allocated in dTD. (Buffer Error bit is set)
— Fulfillment error (Transaction Error bit is set):
– # packets occurred > 0 AND # packets occurred < MULT
— CRC error (Transaction Error bit is set)
NOTE
For ISO, when a dTD is retired, the next dTD is primed for the next frame.
For continuous (micro)frame to (micro)frame operation, DCD must ensure
the dTD linked-list is out ahead of the device controller by at least two
(micro)frames.
Isochronous Pipe Synchronization
When it is necessary to synchronize an isochronous data pipe to the host, the (micro)frame number
(FRINDEX register) can act as a marker. To cause a packet transfer to occur at a specific (micro)frame
number (N), the DCD must interrupt on SOF during frame N-1. When the FRINDEX equals N-1, the DCD
must write the prime bit. The USB OTG primes the isochronous endpoint in (micro)frame N-1 so the
device controller executes delivery during (micro)frame N.
CAUTION
Priming an endpoint towards the end of (micro)frame N-1 does not
guarantee delivery in (micro)frame N. The delivery may actually occur in
(micro)frame N+1 if the device controller does not have enough time to
complete the prime before the SOF for packet N is received.
Isochronous Endpoint Bus Response Matrix
Table 21-55. Isochronous Endpoint Bus Response Matrix
Token
Type
Stall
Not
Primed
Primed
Underflow
Overflow
Setup
STALL
STALL
STALL
N/A
N/A
In
NULL
1
Packet
NULL
Packet
Transmit
BS Error
2
N/A
MCF5329 Reference Manual, Rev 3
Содержание MCF5329
Страница 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 126: ...Enhanced Multiply Accumulate Unit EMAC 4 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 564: ...Liquid Crystal Display Controller LCDC 22 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 692: ...Programmable Interrupt Timers PIT0 PIT3 28 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 720: ...Queued Serial Peripheral Interface QSPI 30 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 790: ...Message Digest Hardware Accelerator MDHA 33 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 902: ...Register Memory Map Quick Reference A 26 Freescale Semiconductor MCF5329 Reference Manual Rev 3...