Preliminary
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Registers
20.9.4 CPPI DMA Scheduler Registers
lists the registers for the CPPI DMA Scheduler submodule.
Table 20-129. CPPI DMA Scheduler Registers
Address Offset
Acronym
CPPI DMA Scheduler Register
3000h
DMA_SCHED_CTRL
CPPI DMA Scheduler Control Register
3800h-38FCh
WORD0-WORD63
CPPI DMA Scheduler Table Word 0-Word 63
20.9.4.1 CPPI DMA Scheduler Control Register (DMA_SCHED_CTRL)
The CPPI DMA scheduler control register (DMA_SCHED_CTRL) contains the major and minor
revisions for the module. This register is shown in
and described in
Figure 20-116. CPPI DMA Scheduler Control Register (DMA_SCHED_CTRL)
31
30
16
enable
Reserved
R/W-0h
R0h7-0
15
8
7
0
Reserved
last_entry
R-0h7-0
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-130. CPPI DMA Scheduler Control Register (DMA_SCHED_CTRL) Field Descriptions
Bits
Field Name
Value
Description
31
enable
This is the enable bit for the scheduler and is encoded as follows:
0
Scheduler is disabled and will no longer fetch entries from the scheduler table or pass
credits to the DMA controller
1
Scheduler is enabled
This bit should only be set after the table has been initialized.
30-8
Reserved
0
Reserved
7-0
last_entry
This field indicates the last valid entry in the scheduler table. There are 64 words in the
table and there are 4 entries in each word. The table can be programmed with any
integer number of entries from 1 to 256. The corresponding encoding for this field is as
follows:
0
1 entry
1
2 entries
…
254
255 entries
255
256 entries
1925
SPRUGX9 – 15 April 2011
Universal Serial Bus (USB)
© 2011, Texas Instruments Incorporated
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