The four transceivers supply the interface between the backplane buses and the backplane data bus/IMM interface circuits. The transceivers receive 5v dc from the transceiver power backplanes.
Processor CCA
There are two identical microprocessors on the processor CCA. The microprocessors do the same operations and use the same software from memory. The processor CCA has bus comparison circuits to compare the data and control the buses of the two microprocessors. The bus comparison circuits check that the microprocessors generate and receive identical information. The bus comparison circuits report a fault to BITE if the data is not identical.
Instruction Memory and Data Memory CCAs
The microprocessors access instruction memory from the instruction memory CCA through the bus comparison circuits. The microprocessors also access data memory from the data memory CCA through the bus comparison circuits. Both memories are software loadable. The memories use electrically erasable programmable read only memory (EEPROM) devices and battery-backed static random access memory (SRAM) devices.
The instruction memory stores operational (OPS) software. It includes this software:
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AIMS -CORE PROCESSOR MODULE/BASIC FUNCTIONAL DESCRIPTION
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Core software
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BITE software
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Operational software for the AIMS functions.
Each microprocessor accesses this instruction software and does the instructions directly out of the instruction memory.
The data memory stores databases and program variables.
These are the databases:
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Navigation database (NDB) software
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Airline modifiable information (AMI) software
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Operational program configuration file (OPC) software
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BITE history data.
These are the program variables:
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FMCF CDU entered data
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CMCF existing faults
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CMCF fault histories.
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AIMS -CORE PROCESSOR MODULE/AIRPLANE CONDITION MONITORING FUNCTION FUNCTIONAL DESCRIPTION
General
The core processor module/airplane condition monitoring function (CPM/ACMF) uses the same hardware as the CPM/ Basic and additional hardware to supply memory to store reports and variables for the airplane condition monitoring system.
The CPM/ACMF does computations for these systems:
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Flight management computing system
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Thrust management computing system
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Airplane condition monitoring system.
CPM/ACMF Hardware
In addition to the five standard CCAs, the CPM/ACMF has a sixth CCA. The sixth CCA is the ACMF memory CCA. The ACMF memory CCA has 6 Mbytes of battery backed static random access memory (SRAM).
ACMF Memory CCA
The ACMF memory CCA includes the:
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Core processor bus interface
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Memory array
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Memory decode logic.
The core processor bus interface communicates with the processor CCA. It supplies the protocol for the data transfers between the ACMF memory CCA and the processor CCA.
The memory array is 6 Mbytes of SRAM. The memory array stores reports and variables.
The memory decode logic supplies the control signals to the memory array. It is the interface between the core processor bus interface and the memory array.
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AIMS -CORE PROCESSOR MODULE/GRAPHICS GENERATOR FUNCTIONAL DESCRIPTION
General
The core processor module/graphics generator (CPM/GG) uses the same hardware as the CPM/Basic and additional hardware to generate image data for the six display units.
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