Aim AFDX / ARINC 664, Reference Manual, Page: 98 / 252

86 Reference Manual AFDX / ARINC 664 Application Interface Library
Section 4 – Function Reference: Transmitter Functions
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Prototype:
AiReturn FdxCmdTxCreateVL( AiUInt32 ul_Handle,
const TY_FDX_TRANSMIT_VL *px_TransmitVL );
Driver Command:
FDX_TX_CREATE_VL (0x00008059)
Purpose:
This function is used to setup a Virtual Link to transmit data. This is only a description of the
Virtual Link specific parameters, which must be known by the system for transmitting. This
function can be used only when the transmitter is not running.
Input:
TY_FDX_TRANSMIT_VL *px_TransmitVL
A pointer to a structure which describes the Virtual Link related parameters for the
transmitter.
typedef struct {
AiUInt32
ul_VlId;
AiUInt32 ul_SubVls;
AiUInt32 ul_Bag;
AiUInt32 ul_NetSelect;
AiUInt32 ul_MaxFrameLength;
AiUInt32 ul_FrameBufferSize;
AiUInt32 ul_MACSourceLSLW;
AiUInt32 ul_MACSourceMSLW;
AiUInt32 ul_skew;
} TY_FDX_TRANSMIT_VL;
AiUInt32 ul_VLId
Virtual Link Identifier. A value in a range from 0 to 65535. This value is part of the MAC
destination address.
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Number of Sub VLs associated to this VL. This Value must be in a range from 1 to 4.
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Specifies the Bandwidth Allocation Gap (BAG)for this Virtual Link in milliseconds.
Possible Values for the BAG are 1 to 128ms defined as 2
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[in ms], where k can have a range
from integer 0 to 7.(Source [5])
The bag limits the bandwidth of a VL. Refer also to ul_SamplingRate defined with
FdxCmdTxUDPCreatePort.
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Specifies the maximum length of one MAC-Frames which can by this VL.