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 (2) Description of the systems 1 and 2 Each system is supplied independently with 115V 400 Hz power and has two channels. Each channel has its own power supply (+ 5V, plus or minus 15V) and acquisition modules. A control channel ensures the slaving functions and produces the currents which are sent to the electro-hydraulic components. A monitoring channel dialogues with the control channel through a serial link and monitors the control channel.
 (a) Control channel This channel uses two boards: the CPU board and the I/O1 board
 1 CPU board
_ (Ref. Fig. 038A) This board executes all the functional programs. It is built around an INTEL 80486 microprocessor that operates at 32Mhz. This board has:
 -
a 4 Mbyte flash memory (OBRM)

 -
a 256 Kbyte RAM

 -
a 64 Kbyte EEPROM (dedicated to the BITE) The CPU board ensures:

 -DSI (discrete inputs) acquisitions,
 -DSO (discrete outputs) generations,
 -DGO (digital outputs) generations,
 -Relays controls,
 -RS232 link with Automatic Test Equipment (ATE),
 -Link with I/O1 and I/O2 boards
 -BITE functions
 2 I/O1 board
_ (Ref. Fig. 050) This board perform the analog and digital (ARINC) acquisition. It generates analog output and dialogs with the CPU board via a common RAM located on the CPU board. This board is built around a DSP TMS 320C31 microprocessor that Operates at 40Mhz. This board has:
 -
a 1 Mbyte flash EPROM

 -
a 512 Kbyte RAM
 The I/O1 board ensures:

 -ANI (analog inputs) acquisitions,
 -DGI (digital inputs) acquisitions,
 -ANO (analog outputs) generations,
 -Power supply (5V plus or minus 15V) monitoring
 -Switching controls.
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 BSCU - Control Channel - I/O1 card
 Figure 050

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 (b)
 Monitoring channel (Ref. Fig. 039A) This channel uses a single board: the I/O2 board. This board is built around a DSP TMS320C31 that operates at 40Mhz. It performs all the acquisitions and computations which enables to monitor the control channel. The monitoring function is ensured by the comparison of the computation results with wraparound of the orders sent by the control channel. The monitoring board is connected to the control boards by an interface bus. This board has:

 -
a 1 Mbyte flash EPROM

 -
a 512 Kbyte RAM
 The I/O2 board ensures:

 -DSI (discrete inputs) acquisitions,
 -ANI (analog inputs) acquisitions,
 -DGI (digital inputs) acquisitions,
 -DSO (discrete outputs) generations,
 -ANO (analog outputs) generations,
 -Power supply (5V plus or minus 15V) monitoring
 -Switching controls.

 (c)
 Connection between the two systems The dialogue is through 4 validity discretes (1 for each channel). During the functional test upon the landing gear extension an exchange of the codes sent over 8 discretes enables to test the two systems.

 (d)
 Operation At each energization the first system supplied takes control. The exclusion between the two systems is ensured by the software. If the two systems are supplied simultaneously the SYS1 has priority. If there is a disagreement between the control and monitoring channels of the system engaged:

 -
the system is disconnected, it cancels its validity bits and isolates its commands,

 -
the system in standby takes over. It validates its commands and ensures again all the functions of the unit with the same level of performance.

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 (3) Software organization of the BSCU The BSCU is made of two systems physically distinct but functionally identical:
 -
System 1,

 -
System 2.
 The unit has two identical software programs (one for each system).
 Each system itself has two channels:

 -Control,

 -Monitoring.

 (a) Software architecture
 The software is divided into two parts:
 - operational software,

 -workshop maintenance software.
 Operational software
 The operational software includes:

 -
the functional software,
　
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