ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 126

• Manufacturer Part Number: ez80190
• Description: Ez80190 Microprocessor
• Manufacturer: ZiLOG Semiconductor

PS006613-0306
Multiply-Accumulator Basic Operation
Figure 22
when performing calculation on a set of data. The progression begins in the upper
left corner with a DATA bank containing the value EMPTY. The CPU loads the
MACC control registers to define the next MACC calculation.
If the MACC is not busy with an existing calculation (EMPTY or DONE), the DATA
and CALC banks are immediately swapped to initiate the new calculation. If the
MACC is busy with an existing calculation, the DATA bank status changes to
READY and waits for the MACC to complete the existing calculation. Then, the
DATA and CALC banks are swapped to initiate the new calculation.
Assuming the DATA bank is EMPTY or READY when the MACC completes the
new calculation, the CALC bank is swapped with the DATA bank. The CPU can
then retrieve the result of the new calculation from the accumulator.
Figure 21. Multiply-Accumulator Block Diagram
demonstrates a simplified view of the state progression of the MACC
x DATA
16
PRELIMINARY
Accumulator
40-Bit
40
32
y DATA
eZ80190 Product Specification
16
Multiply-Accumulator
112