C166S V1 Multiply- Accumulate Unit

134 Pages·2001·1.45 MB·English

User’s Manual, V 1.0, August 2001
C 1 6 6 S V 1 M u l t i p l y -
A c c u m u l a t e U n i t
C166S V1 MAC
Microcontrollers
N e v e r s t o p t h i n k i n g .
Edition 2001-08
Published by Infineon Technologies AG,
St.-Martin-Strasse 53,
D-81541 München, Germany
© Infineon Technologies AG 2001.
All Rights Reserved.
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User’s Manual, V 1.0, August 2001
C 1 6 6 S V 1 M u l t i p l y -
A c c u m u l a t e U n i t
C166S V1 MAC

Microcontrollers
N e v e r s t o p t h i n k i n g .
C166S V1 MAC

Revision History: 2001-08 V 1.0
Previous Version: - -
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User’s Manual
C166S V1 MAC Unit
Table of Contents Page
1 MAC Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Enhanced Addressing Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Multiply-Accumulate Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Program Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 MAC Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Instruction Pipelining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Address Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 CoReg Addressing Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Number Representation and Rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 MAC Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 16 x 16 Signed/Unsigned Parallel Multiplier . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Concatenation Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Sign Extension Unit and Scaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 40-bit Signed Arithmetic Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5 40-bit Signed Accumulator Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.6 Data Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.7 Accumulator Shifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.8 Repeat Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 MAC Unit Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 MAC Unit Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 MAC Unit Address Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2 Accumulator Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.3 MAC Unit Status Word (MSW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4 MAC Unit Control Word (MCW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.5 MAC Unit Repeat Word (MRW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6 MAC Unit Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.1 Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2 List of MAC Unit Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7 Instruction Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
8 Keyword Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
C166S V1 MAC, User’s Manual I-1 V1.0, 2001-08
User’s Manual
C166S V1 MAC Unit

C166S V1 MAC, User’s Manual I-2 V1.0, 2001-08
User’s Manual
C166S V1 MAC Unit
List of Tables Page
Table 1 Pointer Post-modification Combinations for IDXi and Rwn . . . . . . . . . . 7
Table 2 Parallel Data Move Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3 CoReg 5-bit Addressing Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4 Data Limiter Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 5 MAC Unit Instruction Set Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . 29
C166S V1 MAC, User’s Manual II-1 V1.0, 2001-08
User’s Manual
C166S V1 MAC Unit

C166S V1 MAC, User’s Manual II-2 V1.0, 2001-08
User’s Manual
C166S V1 MAC Unit
MAC Unit Features

1 MAC Unit Features
The Multiply-Accumulate (MAC) Unit is a specialized co-processor added to the C166S
CPU core to improve the performance of signal processing algorithms. It includes:
(cid:127) a multiply-accumulate unit
(cid:127) an address generation unit capable of feeding the MAC Unit with 2 operands per cycle
(cid:127) a repeat unit to execute a series of multiply-accumulate instructions
The architecture of the MAC Unit is outlined in (cid:1)(cid:2)(cid:3)(cid:4)(cid:5)(cid:6) (cid:7).
C166S V1 MAC, User’s Manual -3- V1.0, 2001-08
User’s Manual
C166S V1 MAC Unit
MAC Unit Features

16-bit Input Operands
Concatenation Signed/Unsigned
Unit
Multiplier
16-bit
32-bit
40-bit
Mux
Sign Extend
ACCU
1-bit Scaler
Shifter
0h 08000h 0h
Mux Mux
(cid:11)(cid:7)(cid:29)(cid:29)(cid:26)(cid:8)(cid:11)(cid:30)(cid:12)
(cid:9)(cid:28)(cid:27)
Repeat Unit A B
40-bit Signed Arithmetic Unit
(cid:17)(cid:13)(cid:14)(cid:6)(cid:5)(cid:5)(cid:4)(cid:18)(cid:14)
(cid:11)(cid:19)(cid:13)(cid:14)(cid:5)(cid:19)(cid:20)(cid:20)(cid:6)(cid:5)
(cid:9)(cid:11)(cid:27) (cid:1)(cid:20)(cid:24)(cid:3)(cid:25) (cid:9)(cid:10)(cid:23) (cid:9)(cid:10)(cid:21) (cid:9)(cid:10)(cid:22)
(cid:9)(cid:26)(cid:27)
Control Unit
Data Limiter
(cid:9)(cid:10)(cid:26)
(cid:1)(cid:2)(cid:3)(cid:4)(cid:5)(cid:6) (cid:7) (cid:8)(cid:9)(cid:10)(cid:11)(cid:8)(cid:12)(cid:13)(cid:2)(cid:14)(cid:8)(cid:10)(cid:5)(cid:15)(cid:16)(cid:2)(cid:14)(cid:6)(cid:15)(cid:14)(cid:4)(cid:5)(cid:6)
C166S V1 MAC, User’s Manual -4- V1.0, 2001-08