Freescale Semiconductor MPC8313E PowerQUICC II Pro Family Reference Manual page 947

Offset 0x2_314C
31
R
W
Reset 0 0 0 0 0
Bits Name
31–14 — Reserved, should be cleared.
13–0 FRINDEX Frame index. The value in this register increments at the end of each time frame (for example, microframe).
Bits N–3 are used for the Frame List current index. This means that each location of the frame list is
accessed 8 times (frames or microframes) before moving to the next index.
In device mode, the value is the current frame number of the last frame transmitted. It is not used as an
index.
In either mode, bits 2–0 indicate the current microframe.
Table 16-14 illustrates values of N based on the value of the Frame List Size in the USBCMD register,
when used in host mode.
USBCMD[FS]
16.3.2.5 Control Data Structure Segment Register (CTRLDSSEGMENT)
The CTRLDSSEGMENT register is not implemented on the MPC8313E.
16.3.2.6 Periodic Frame List Base Address Register (PERIODICLISTBASE)
This register contains the beginning address of the Periodic Frame List in the system memory. The host
controller driver loads this register prior to starting the schedule execution by the controller. The memory
structure referenced by this physical memory pointer is assumed to be 4-Kbyte aligned. The contents of
this register are combined with the frame index register (FRINDEX) to enable the controller to step
through the Periodic Frame List in sequence.
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
Freescale Semiconductor
—
0 0 0 0 0 0 0 0 0 0 0 0
Figure 16-11. USB Frame Index (FRINDEX)
Table 16-13. FRINDEX Register Field Descriptions
Table 16-14. FRINDEX N Values
Frame List Size
000 1024 elements (4096 bytes)
001 512 elements (2048 bytes)
010 256 elements (1024 bytes)
011 128 elements (512 bytes)
100 64 elements (256 bytes)
101 32 elements (128 bytes)
110 16 elements (64 bytes)
111 8 elements (32 bytes)
14 13
0 n n n n n n n n n n n n n n
Description
FRINDEX N value
12
11
10
9
8
7
6
5
Universal Serial Bus Interface
Access: Read/Write
FRINDEX
16-19
0