Хост-контроллер USB2.0: список регистров

  CCA_31_8

HCCA[31:8]
This is the base address of the Host Controller Communication Area.
This area is used to hold the control structures and the Interrupt table that are accessed by both the Host Controller and the Host Controller Driver.

  HCCA_7_0

HCCA[7:0]
The alignment restriction in HcHCCA register is evaluated by examining the number of zeros in the lower order bits.
The minimum alignment is 256 bytes, therefore, bits 0 through 7 must always return 0 when read.

Команда U-Boot для чтения регистра

Bit fields structure

typedef union  o_hchcca
{
  struct
  {
   unsigned hcca_7_0 : 8;
   unsigned cca_31_8 : 24;
  } b;
   unsigned long w;
} O_HcHCCA