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The SPEED_MAP structure is stores an IEEE 1394 bus speed map.
Syntax
typedef struct _SPEED_MAP {
USHORT SPD_Length;
USHORT SPD_CRC;
ULONG SPD_Generation;
UCHAR SPD_Speed_Code[4032];
} SPEED_MAP, *PSPEED_MAP;
Members
SPD_Length
Specifies the number of quadlets in the speed map.
SPD_CRC
Specifies the CRC value for the speed map.
SPD_Generation
Specifies the generation count for the bus reset that corresponds to this speed map.
SPD_Speed_Code[4032]
Specifies an array of speed codes. Currently, the possible values are:
SCODE_100_RATE
SCODE_200_RATE
SCODE_400_RATE
Remarks
The SPEED_MAP structure describes the maximum speed that devices on the bus can attain. All values in this structure are recorded in big-endian format.
Requirements
| Requirement | Value |
|---|---|
| Header | 1394.h (include 1394.h) |