dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 148

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

Data Arithmetic Logic Unit
5.1
The major components of the data ALU are:
A programming model of the data ALU unit is shown in Figure 5-1, and a block diagram is shown in
Figure 5-2 on page 5-3. The blocks and registers within the data ALU are explained in the following
sections.
5-2
•
•
•
•
•
•
•
Three 16-bit data registers (X0, Y0, and Y1).
Four 36-bit accumulator registers (A, B, C, and D).
A single-cycle multiply-accumulator (MAC) unit.
A single-bit accumulator shifter.
An arithmetic and logical multi-bit shifter.
A MAC output limiter.
A data limiter.
Data ALU Overview and Architecture
C
D
A
B
Y
Figure 5-1. Data ALU Programming Model
35
A2
B2
C2
D2
32
DSP56800E Core Reference Manual
31
15
A1
B1
C1
D1
Y1
Y0
X0
16
0
15
A0
B0
C0
D0
0
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