Preliminary
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Registers
20.9.1.9 USBSS IRQ_DMA_THRESHOLD_TX0_1 Register (IRQDMATHOLDTX01)
The USBSS IRQ_DMA_THRESHOLD_TX0_1 register (IRQDMATHOLDTX01) defines the size of the
four DMA thresholds for interrupt pacing for USB0. Each threshold contains an 8-bit unsigned number
and can range from 0 to 255. A possible interrupt can be triggered if the count for that specific endpoint
has exceeded the value of the threshold. The counter for the compared value is also an 8-bit unsigned
number; therefore, setting the threshold to 255 prevents the possibility of a trigger.
The USBSS IRQ_DMA_THRESHOLD_TX0_1 register is shown in
and described in
.
Figure 20-30. USBSS IRQ_DMA_THRESHOLD_TX0_1 Register (IRQDMATHOLDTX01)
31
24 23
16 15
8
7
0
dma_thres_tx0_7
dma_thres_tx0_6
dma_thres_tx0_5
dma_thres_tx0_4
R/W-0
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-40. USBSS IRQ_DMA_THRESHOLD_TX0_1 Register (IRQDMATHOLDTX01) Field
Descriptions
Bits
Field
Description
31-24
dma_thres_tx0_7
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 7.
23-16
dma_thres_tx0_6
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 6.
15-8
dma_thres_tx0_5
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 5.
7-0
dma_thres_tx0_4
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 4.
20.9.1.10 USBSS IRQ_DMA_THRESHOLD_TX0_2 Register (IRQDMATHOLDTX02)
The USBSS IRQ_DMA_THRESHOLD_TX0_2 register (IRQDMATHOLDTX02) defines the size of the
four DMA thresholds for interrupt pacing for USB0. Each threshold contains an 8-bit unsigned number
and can range from 0 to 255. A possible interrupt can be triggered if the count for that specific endpoint
has exceeded the value of the threshold. The counter for the compared value is also an 8-bit unsigned
number; therefore, setting the threshold to 255 prevents the possibility of a trigger.
The USBSS IRQ_DMA_THRESHOLD_TX0_2 register is shown in
and described in
.
Figure 20-31. USBSS IRQ_DMA_THRESHOLD_TX0_2 Register (IRQDMATHOLDTX02)
31
24 23
16 15
8
7
0
dma_thres_tx0_11
dma_thres_tx0_10
dma_thres_tx0_9
dma_thres_tx0_8
R/W-0
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-41. USBSS IRQ_DMA_THRESHOLD_TX0_2 Register (IRQDMATHOLDTX02) Field
Descriptions
Bits
Field
Description
31-24
dma_thres_tx0_11
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 11.
23-16
dma_thres_tx0_10
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 10.
15-8
dma_thres_tx0_9
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 9.
7-0
dma_thres_tx0_8
DMA threshold value for tx_pkt_cmp_0 for USB0 endpoint 8.
1837
SPRUGX9 – 15 April 2011
Universal Serial Bus (USB)
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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