// 1394.h

typedef struct _CYCLE_TIME {
  ULONG CL_CycleOffset : 12;
  ULONG CL_CycleCount : 13;
  ULONG CL_SecondCount : 7;
} CYCLE_TIME, *PCYCLE_TIME;
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Windows Driver Kit DDI reference (ns-1394-_cycle_time)

_CYCLE_TIME structure

Description

The CYCLE_TIME structure contains the IEEE 1394 isochronous cycle time.

Members

`CL_CycleOffset`

Specifies the number of clock ticks (based on a 24.576 MHz clock) since the current isochronous cycle began.

`CL_CycleCount`

Specifies the number of isochronous cycles in the current second.

`CL_SecondCount`

Specifies the number of seconds. This count wraps to zero every 128 seconds.

Remarks

The layout of this structure matches that of the CYCLE_TIME register in the IEEE 1394-1995 specification.

CYCLE_TIME - NtDoc