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USB Registers
16.5.7.3 FDBSC0 Register (offset = 20h) [reset = 0h]
FDBSC0 is shown in Figure 16-279 and described in Table 16-293.
Figure 16-279. FDBSC0 Register
31 30 29 28 27 26 25 24
FDBQ3_STARVE_CNT
R-0
23 22 21 20 19 18 17 16
FDBQ2_STARVE_CNT
R-0
15 14 13 12 11 10 9 8
FDBQ1_STARVE_CNT
R-0
7 6 5 4 3 2 1 0
FDBQ0_STARVE_CNT
R-0
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 16-293. FDBSC0 Register Field Descriptions
Bit Field Type Reset Description
31-24 FDBQ3_STARVE_CNT R-0 0 This field increments each time the Free Descriptor/Buffer Queue 3
is read while it is empty via the CPPI DMA.
This field is cleared when read via the cpu.
23-16 FDBQ2_STARVE_CNT R-0 0 This field increments each time the Free Descriptor/Buffer Queue 2
is read while it is empty via the CPPI DMA.
This field is cleared when read via the cpu.
15-8 FDBQ1_STARVE_CNT R-0 0 This field increments each time the Free Descriptor/Buffer Queue 1
is read while it is empty via the CPPI DMA.
This field is cleared when read via the cpu.
7-0 FDBQ0_STARVE_CNT R-0 0 This field increments each time the Free Descriptor/Buffer Queue 0
is read while it is empty via the CPPI DMA.
This field is cleared when read via the cpu.
Queue_Manager_Free_Descriptor_Buffer_Starvation_Count
Register 0
2111
SPRUH73H–October 2011–Revised April 2013 Universal Serial Bus (USB)
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