Aim MIL-STD-1553 - Page 240

MIL-STD-1553 Reference Manual
226
Chapter 7 – Bus Controller Functions
BC Transfer Bus Mode
Value
Constant
Description
0
API_TBM_TRANSFER
Transfer Specific Bus Mode
The initial default MILBus (primary or
secondary) for a specific MILBus transfer is
defined in the corresponding Transfer
Descriptor (see relating setting of the
command “ApiCmdBCXferDef”). If a retry is
successful on a MILBus, this MILBus
becomes the default MILBus for the specific
MILBus transfer only until another retry
switches the bus back.
1
API_TBM_GLOBAL
Global Bus Mode
The initial default MILBus (primary or
secondary) for all MILBus transfers is defined
with the parameter ‘gsb’ which is described
below. If a retry is successful on the alternate
MILBus, the MILBus is permanently switched
for all transfers until another retry switches the
bus back.
Note: Value 1 is not available on devices with a multi channel firmware. Please see chapter
“Limitations for specific boards” for details.
A
A
i
i
U
U
I
I
n
n
t
t
8
8
g
g
s
s
b
b
Global Start Bus
TBM
Value
Constant
Description
1
0
API_BC_XFER_BUS_PRIMARY
Primary Bus
1
1
API_BC_XFER_BUS_SECONDARY
Secondary Bus
O
O
u
u
t
t
p
p
u
u
t
t
n
n
o
o
n
n
e
e
Return Value
A
A
i
i
I
I
n
n
t
t
1
1
6
6
All API functions return API_OK if no error occurred. If the return value is not equal
to API_OK the function ApiGetErrorDescription can be used to obtain an error
description.