ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 137

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

PS006613-0306
to x RAM while the other vector must be written to y RAM. The software then
writes values to the MACC control registers to indicate where the x and y data is
to be stored for the current calculation. For both x and y data, there are 3 values
defining the data location:
1. MACC_xSTART and MACC_ySTART define the address of the first x and y
2. MACC_xEND and MACC_yEND define the end of the linear address space
3. MACC_xRELOAD and MACC_yRELOAD define the circular address to be
An example of address indexing for a MACC calculation is illustrated in
The first value is the address returned by the MACC_xSTART register, taken from
the x RAM memory location. The address increments linearly until the value is
used from the address returned by the MACC_xEND register. Instead of incre-
menting to the next linear address, the next value is taken from the address
returned by the MACC_xRELOAD register. Incrementing recommences until the
required number of multiply-accumulate operations is completed, as defined by
the value in the MACC_LENGTH register.
values to be multiplied together.
for the x and y data, respectively. After either the x or y ending value is
reached, the next address is defined by MACC_xRELOAD or
MACC_yRELOAD, respectively.
used when either the x index counter or the y index counter reaches the
ending value for the linear address space.
PRELIMINARY
eZ80190 Product Specification
Multiply-Accumulator
Figure
24.
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