MPC8536E-ANDROID Freescale Semiconductor, MPC8536E-ANDROID Datasheet - Page 1472
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MPC8536E-ANDROID
Manufacturer Part Number
MPC8536E-ANDROID
Description
HARDWARE/SOFTWARE ANDROID OS
Manufacturer
Freescale Semiconductor
Series
PowerQUICC ™r
Type
MPUr
Datasheets
1.MPC8536EBVTAVLA.pdf
(127 pages)
2.MPC8536EBVTAVLA.pdf
(2 pages)
3.MPC8536EBVTAVLA.pdf
(1706 pages)
Specifications of MPC8536E-ANDROID
Contents
Board
For Use With/related Products
MPC8536
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 1472 of 1706
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Universal Serial Bus Interfaces
21.8.5
21.8.5.1
It is necessary for the DCD software to maintain head and tail pointers to the for the linked list of dTDs
for each respective queue head. This is necessary because the dQH only maintains pointers to the current
working dTD and the next dTD to be executed. The operations described in next section for managing dTD
will assume the DCD can use reference the head and tail of the dTD linked list.
21.8.5.2
Before a transfer can be executed from the linked list, a dTD must be built to describe the transfer. Use the
following procedure for building dTDs.
Allocate 8-DWord dTD block of memory aligned to 8-DWord boundaries. Example: bit address 4–0 would
be equal to ‘00000’
Write the following fields:
21-138
4. Decode setup packet and prepare data phase [optional] and status phase transfer as required by the
1. Initialize first 7 DWords to 0.
2. Set the terminate bit to ‘1.’
3. Fill in total bytes with transfer size.
4. Set the interrupt on complete if desired.
5. Initialize the status field with the active bit set to ‘1’ and all remaining status bits set to ‘0.’
USB Chapter 9 or application specific protocol.
Managing Transfers with Transfer Descriptors
Software Link Pointers
Building a Transfer Descriptor
It is possible for the device controller to receive setup packets before
previous control transfers complete. Existing control packets in progress
must be flushed and the new control packet completed.
To conserve memory, the reserved fields at the end of the dQH can be used
to store the Head and Tail pointers but it still remains the responsibility of
the DCD to maintain the pointers.
Head Pointer
MPC8536E PowerQUICC III Integrated Processor Reference Manual, Rev. 1
Completed dTDs
Figure 21-64. Software Link Pointers
Endpoint QH
Current
NOTE
NOTE
Queued dTDs
Next
Tail Pointer
Freescale Semiconductor
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