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Universal Serial Bus Interface – On-The-Go Module
Freescale Semiconductor
21-53
21.5.2.2.3
dTD Buffer Page Pointer List (Offset = 0x8–0x18)
The last five longwords of a device element transfer descriptor are an array of physical memory address
pointers. These pointers reference the individual pages of a data buffer.
11–10
MultO
Multiplier Override. This field can possibly transmit-ISOs ( ISO-IN) to override the multiplier in the QH. This field
must be 0 for all packet types not transmit-ISO.
For example, if QH.MULT equals 3; Maximum packet size equals 8; Total Bytes equals 15; MultiO equals 0
[default], then three packets are sent: {Data2(8); Data1(7); Data0(0)}.
If QH.MULT equals 3; Maximum packet size equals 8; Total Bytes equals 15; MultO equals 2, then two packets
are sent: {Data1(8); Data0(7)}
For maximal efficiency, software must compute MultO equals greatest integer of (Total Bytes / Max. Packet Size)
except for the case when Total Bytes equals 0; then MultO must be 1.
Note: Non-ISO and Non-TX endpoints must set MultO equals 00.
9–8
Reserved. Reserved for future use and must be cleared.
7–0
Status
Status. Device controller communicates individual command execution states back to the DCD software. This field
contains the status of the last transaction performed on this dTD. The bit encodings are:
Bit
Status Field Description
7
Active. Set by software to enable the execution of transactions by the device controller.
6
Halted. Set by the device controller during status updates to indicate a serious error has
occurred at the device/endpoint addressed by this dTD. Any time a transaction results in the
halted bit being set, the active bit is also cleared.
5
Data Buffer Error. Set by the device controller during status update to indicate the device
controller is unable to maintain the reception of incoming data (overrun) or is unable to supply
data fast enough during transmission (under run).
4 Reserved.
3
Transaction Error. Set by the device controller during status update in case the device did not
receive a valid response from the host (time-out, CRC, bad PID).
2–0
Reserved.
Table 21-47. Buffer Page Pointer List
Field
Description
31–12
Buffer Pointer
Buffer Pointer. Selects the page offset in memory for the packet buffer. Non virtual memory systems typically
set the buffer pointers to a series of incrementing integers.
0;11–0
Current Offset
Current Offset. Offset into the 4kB buffer where the packet begins.
1;10–0
Frame Number
Frame Number. Written by the device controller to indicate the frame number a packet finishes in. Typically
correlates relative completion times of packets on an ISO endpoint.
Table 21-46. dTD Token (continued)
Field
Description
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...