A dual processor card employing the fixed point ADSP2105 and the floating point ADSP21020. The MAC control performs the following tasks :
1.Generation and Distribution of Control Signals:
The generation of the control signals is done using certain basic information such as number of cards in the subrack ( which will be a constant in the field ), the amount of STA to be performed, the number of channels to be read out, the kind of MAC mode required etc. This information is provided to the MAC Control by the CCC via MCC. The MAC control then calculates the various other signals on the basis of this information and loads the RAMs appropriately. This task is performed by the ADSP2105.
2.LTA:
The STA output is read from MAC cards into the MAC control card. The MAC outputs are stored on the MAC control in a dual port RAM from which the ADSP2105 reads the STA numbers. The ADSP2105 then unscrambles the outputs and passes the real and imaginary mantissas, as a 21-bit number, to a look up table for conversion to IEEE floating-point format.
The converted output from the look-up table is then read by the ADSP21020. The 21020 performs the specified LTA by adding these results ( σxi ). It can also compute σxi2 to calculate the variance of the incoming data stream. The LTA output is read out into the rack control card which transmits it to the DATA Acquisition System ( DAS ).