Freescale Semiconductor MCF5480 - Manual (Page 153)

Memory Map/Register Definition
MCF548x Reference Manual, Rev. 3
Freescale Semiconductor 4-5
The need to move large amounts of data presents an obstacle to obtaining high throughput rates in DSP
engines. New and existing ColdFire instructions can accommodate these requirements. A MOVEM
instruction can move large blocks of data efficiently by generating line-sized burst transfers. The ability to
simultaneously load an operand from memory into a register and execute a MAC instruction makes some
DSP operations such as filtering and convolution more manageable.
The programming model includes a 16-bit mask register (MASK), which can optionally be used to
generate an operand address during MAC + MOVE instructions. The application of this register with
auto-increment addressing mode supports efficient implementation of circular data queues for memory
operands.
The additional MAC status register (MACSR) contains a 4-bit operational mode field and condition flags.
Operational mode bits control whether operands are signed or unsigned and whether they are treated as
integers or fractions. These bits also control the overflow/saturation mode and the way in which rounding
is performed. Negative, zero, and multiple overflow condition flags are also provided.
4.2 Memory Map/Register Definition
The EMAC provides the following program-visible registers:
• Four 32-bit accumulators (ACCn = ACC0, ACC1, ACC2, and ACC3)
• Eight 8-bit accumulator extensions (two per accumulator), packaged as two 32-bit values for load
and store operations (ACCext01 and ACCext23)
• One 16-bit mask register (MASK)
• One 32-bit MAC status register (MACSR) including four indicator bits signaling product or
accumulation overflow (one for each accumulator: PAV0–PAV3)
These registers are shown in Figure 4-6 .
Figure 4-6. EMAC Register Set
4.2.1 MAC Status Register (MACSR)
MACSR functionality is organized as follows:
• MACSR[11–8] contains one product/accumulation overflow flag per accumulator.
• MACSR[7–4] defines the operating configuration of the MAC unit.
• MACSR[3–0] contains indicator flags from the last MAC instruction execution.
31 0
MACSR MAC status register
ACC0 MAC accumulator 0
ACC1 MAC accumulator 1
ACC2 MAC accumulator 2
ACC3 MAC accumulator 3
ACCext01 Extensions for ACC0 and ACC1
ACCext23 Extensions for ACC2 and ACC3
MASK MAC mask register