MPC8536E-ANDROID Freescale Semiconductor, MPC8536E-ANDROID Datasheet - Page 1400

• Manufacturer Part Number: MPC8536E-ANDROID
• Description: HARDWARE/SOFTWARE ANDROID OS
• Manufacturer: Freescale Semiconductor
• Series: PowerQUICC ™r
• Type: MPUr

Specifications of MPC8536E-ANDROID

• Contents: Board
• For Use With/related Products: MPC8536
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Universal Serial Bus Interfaces
21.6.5
The host controller executes transactions for devices using a simple, shared-memory schedule. The
schedule is comprised of a few data structures, organized into two distinct lists. The data structures are
designed to provide the maximum flexibility required by USB, minimize memory traffic and
hardware/software complexity.
System software maintains two schedules for the host controller: a periodic schedule and an asynchronous
schedule. The root of the periodic schedule is the PERIODICLISTBASE register. See
“Periodic Frame List Base Address Register (PERIODICLISTBASE),”
PERIODICLISTBASE register is the physical memory base address of the periodic frame list. The
periodic frame list is an array of physical memory pointers. The objects referenced from the frame list must
be valid schedule data structures as defined in
if the periodic schedule is enabled (see) then the host controller must execute from the periodic schedule
before executing from the asynchronous schedule. It will only execute from the asynchronous schedule
after it encounters the end of the periodic schedule. The host controller traverses the periodic schedule by
constructing an array offset reference from the PERIODICLISTBASE and the FRINDEX registers (see
Figure
The end of the periodic schedule is identified by a next link pointer of a schedule data structure having its
T-bit set. When the host controller encounters a T-Bit set during a horizontal traversal of the periodic list,
it interprets this as an End-Of-Periodic-List mark. This causes the host controller to cease working on the
periodic schedule and transitions immediately to traversing the asynchronous schedule. Once this
transition is made, the host controller executes from the asynchronous schedule until the end of the
micro-frame.
21-66
31
21-42). It fetches the element and begins traversing the graph of linked schedule data structures.
Schedule Traversal Rules
31
Periodic Frame List Base
MPC8536E PowerQUICC III Integrated Processor Reference Manual, Rev. 1
Address
Figure 21-42. Derivation of Pointer into Frame List Array
Periodic Frame List Element
DWord-Aligned
Address
12
Section 21.5, “Host Data Structures.”
13 12
12 11
Frame Index Register
3 2
for more information. The
2 1 0
0
In each micro-frame,
Freescale Semiconductor
Periodic Frame
Section 21.3.2.6,
List
•
•
•