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SELF_ID structure (1394.h)

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The SELF_ID structure contains a raw packet zero self-ID packet.

Syntax

typedef struct _SELF_ID {
  ULONG SID_Phys_ID : 6;
  ULONG SID_Packet_ID : 2;
  ULONG SID_Gap_Count : 6;
  ULONG SID_Link_Active : 1;
  ULONG SID_Zero : 1;
  ULONG SID_Power_Class : 3;
  ULONG SID_Contender : 1;
  ULONG SID_Delay : 2;
  ULONG SID_Speed : 2;
  ULONG SID_More_Packets : 1;
  ULONG SID_Initiated_Rst : 1;
  ULONG SID_Port3 : 2;
  ULONG SID_Port2 : 2;
  ULONG SID_Port1 : 2;
} SELF_ID, *PSELF_ID;

Members

SID_Phys_ID

Specifies the device node number. This member contains bits 0-5 of byte 0 of the self-ID packet.

SID_Packet_ID

Must be PHY_PACKET_ID_SELF_ID. This member contains bits 6-7 of byte 0 of the self-ID packet.

SID_Gap_Count

Specifies the current value of the node's PHY_CONFIGURATION register's gap_count member. This member contains bits 0-5 of byte 1 of the self-ID packet.

SID_Link_Active

One if the device's link and transaction layers are active, zero otherwise. This member contains bit 6 of byte 1 of the self-ID packet.

SID_Zero

Always zero. This member contains bit 7 of byte 1 of the self-ID packet.

SID_Power_Class

The possible power classes are:

POWER_CLASS_NOT_NEED_NOT_REPEAT

POWER_CLASS_SELF_POWER_PROVIDE_15W

POWER_CLASS_SELF_POWER_PROVIDE_30W

POWER_CLASS_SELF_POWER_PROVIDE_45W

POWER_CLASS_MAYBE_POWERED_UPTO_1W

POWER_CLASS_IS_POWERED_UPTO_1W_NEEDS_2W

POWER_CLASS_IS_POWERED_UPTO_1W_NEEDS_5W

POWER_CLASS_IS_POWERED_UPTO_1W_NEEDS_9W

This member contains bits 0-2 of byte 2 of the self-ID packet.

SID_Contender

One if this node is a contender for bus or isochronous resource manager, zero otherwise. This member contains bit 3 of byte 2 of the self-ID packet.

SID_Delay

Currently always zero. This member contains bits 4-5 of byte 2 of the self-ID packet.

SID_Speed

Specifies the maximum data transfer rate that is supported by the node. This member must have one of the values specified in the following table.

Value Speed
0 S100 speed
1 S200 speed
2 S400 speed
3 Reserved (generally treated as S400/S800 speed)

SID_More_Packets

One if this packet will be followed by SELF_ID_MORE packets, zero otherwise. This member contains bit 0 of byte 3 of the self-ID packet.

SID_Initiated_Rst

One if this node initiated the most recent bus reset, zero otherwise. This member contains bit 1 of byte 3 of the self-ID packet.

SID_Port3

Byte 3 - Bits 2-3

SID_Port2

Byte 3 - Bits 4-5

SID_Port1

Specifies port status. Possible values are:

SELF_ID_CONNECTED_TO_CHILD

SELF_ID_CONNECTED_TO_PARENT

SELF_ID_NOT_CONNECTED

SELF_ID_NOT_PRESENT

Member SID_Port1 contains bits 2-3 of byte 3 of the self-ID packet. Member SID_Port2 contains bits 4-5 of byte 3 of the self-ID packet. Member SID_Port3 contains bits 6-7 of byte 3 of the self-ID packet.

Remarks

This structure corresponds to self ID packet 0, as described in the P1394a specification.

Requirements

Requirement Value
Header 1394.h (include 1394.h)

See also

TOPOLOGY_MAP