Регистры Allwinner H616
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O_HcLSThreshold
9.5.3. OHCI LS Threshold Register - адрес: 0x5200444 0x5310444 0x5311444 (смещение: 0x0444)

Хост-контроллер USB2.0: список регистров

31 |•|•|•|•|•|•|•|•|•|•|•|•|•|•|•|•| 16
15 |•|•|•|•|•|•|•|•|•|•|•|•|•|•|•|•| 00

  Unused

Bits 31 : 12

  LST_HRES_HOLD

Bits 11 : 0
R/W (R)
0x0628

This field contains a value which is compared to the FrameRemaining field prior to initiating a Low Speed transaction.
The transaction is started only if FrameRemaining this field.
The value is calculated by HCD with the consideration of transmission and setup overhead.

HCD (HC)

Команда U-Boot для чтения регистра

md 5200444 1
md 5310444 1
md 5311444 1

Bit fields structure 

typedef union  o_hclsthreshold
{
  struct
  {
   unsigned lst_hres_hold : 12;
   unsigned unused0 : 20;
  } b;
   unsigned long w;
} O_HcLSThreshold
Allwinner H616 Manual