ST STM32F10 Series - Table 63. Definition of Allocated Buffer Memory

UM0306 USB full speed device interface (USB)
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Table 63. Definition of allocated buffer memory
Value of
NUM_BLOCK[4:0]
Memory allocated
when BL_SIZE=0
Memory allocated
when BL_SIZE=1
0 (‘00000’) Not allowed 32 bytes
1 (‘00001’) 2 bytes 64 bytes
2 (‘00010’) 4 bytes 96 bytes
3 (‘00011’) 6 bytes 128 bytes
... ... ...
15 (‘01111’) 30 bytes 512 bytes
16 (‘10000’) 32 bytes N/A
17 (‘10001’) 34 bytes N/A
18 (‘10010’) 36 bytes N/A
... ... ...
30 (‘11110’) 60 bytes N/A
31 (‘11111’) 62 bytes N/A
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