Aim ANET1553 Series, Руководство пользователя, Страница: 43 / 72

4. Structure of the ANET1553
ANET1553-x
User’s Manual
33
4.3.3 External Trigger Inputs and Outputs
One common Trigger Input and one common Trigger Output line is provided for the
following operating modes Bus Controller (BC), Remote Terminal (RT) and Bus Monitor
(BM).
Trigger-OUT
Because only one Trigger OUT and one Trigger IN are available for each MILBus
Channel, the Trigger Output of the ANET is a logical OR function of the BC-, BM- and
the RT-Trigger signals.
Trigger-IN
The LVTTL (3.3V) external Trigger-Inputs are high active and +5.0V tolerant. The
external Trigger IN is passed (provided) to the BC, BM and RT FPGA internal trigger
logic simultaneously and is caught by the operating mode (BC, RT, BM) where the
trigger mode is activated.
The external Trigger-IN pulse length must be at least 75 nanoseconds.
4.4 Physical MIL-STD-1553B I/O Interface, MILBus Coupling Modes
Up to two dual redundant MIL-STD-1553A/B channels are available. The on board
MILBus Transceivers provide variable output amplitude.
The following programmable coupling modes are provided:
(left hand side = bus side, right hand side = ANET1553 side)
MIL-BUS Isolated (Default) No connection to the MILBus
MIL-BUS Transformer Coupled
SH
LG
/LG
/SH
IN
/IN
MIL-BUS Direct Coupled
SH
LG
/LG
/SH
IN
/IN
55R
55R
MIL-BUS Transformer Coupled
with Network Emulation
IN
/IN
SH
LG
/LG
/SH
23R
23R 23R
23R
2
3
R
Figure 4.4-1 Coupling modes