Preliminary
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Registers
20.9.1.26 USBSS IRQ_FRAME_THRESHOLD_TX0_0 Register (IRQFRAMETHOLD00)
The USBSS IRQ_FRAME_THRESHOLD_TX0_0 register (IRQFRAMETHOLD00) defines the size of
the four FRAME thresholds for interrupt pacing for USB0. Each threshold contains is 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_FRAME_THRESHOLD_TX0_0 register is shown in
and described in
.
Figure 20-47. USBSS IRQ_FRAME_THRESHOLD_TX0_0 Register (IRQFRAMETHOLD00)
31
24 23
16 15
8
7
0
frame_thres_tx1_3
frame_thres_tx1_2
frame_thres_tx1_1
Reserved
R/W-0
R/W-0
R/W-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-57. USBSS IRQ_FRAME_THRESHOLD_TX0_0 Register (IRQFRAMETHOLD00) Field
Descriptions
Bits
Field
Description
31-24
frame_thres_tx1_3
FRAME threshold value for tx_pkt_cmp_0 for USB1 endpoint 3.
23-16
frame_thres_tx1_2
FRAME threshold value for tx_pkt_cmp_0 for USB1 endpoint 2.
15-8
frame_thres_tx1_1
FRAME threshold value for tx_pkt_cmp_0 for USB1 endpoint 1.
7-0
Reserved
Always read as 0. Writes have no effect.
20.9.1.27 USBSS IRQ_FRAME_THRESHOLD_TX0_1 Register (IRQFRAMETHOLDTX01)
The USBSS IRQ_FRAME_THRESHOLD_TX0_1 register (IRQFRAMETHOLDTX01) defines the size of
the four FRAME thresholds for interrupt pacing for USB0. Each threshold contains is 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_FRAME_THRESHOLD_TX0_1 register is shown in
and described in
.
Figure 20-48. USBSS IRQ_FRAME_THRESHOLD_TX0_1 Register (IRQFRAMETHOLD01)
31
24 23
16 15
8
7
0
frame_thres_tx1_7
frame_thres_tx1_6
frame_thres_tx1_5
frame_thres_tx1_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 20-58. USBSS IRQ_FRAME_THRESHOLD_TX0_1 Register (IRQFRAMETHOLDTX01) Field
Descriptions
Bits
Field
Description
31-24
frame_thres_tx1_
FRAME threshold value for tx_pkt_cmp_0 for USB1 endpoint 7.
7
23-16
frame_thres_tx1_
FRAME threshold value for tx_pkt_cmp_0 for USB1 endpoint 6.
6
15-8
frame_thres_tx1_
FRAME threshold value for tx_pkt_cmp_0 for USB1 endpoint 5.
5
7-0
frame_thres_tx1_
FRAME threshold value for tx_pkt_cmp_0 for USB1 endpoint 4.
4
1847
SPRUGX9 – 15 April 2011
Universal Serial Bus (USB)
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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