Table A-13. S Field; Table A-14. Si Field; Table A-15. Src2 Field; Table A-16. T-Field - Lucent Technologies DSP1617 Information Manual

Information Manual
April 1998
A.2 Field Descriptions
S Field
S field specifies a source accumulator.

Table A-13. S Field

S Register
0 Accumulator 0
1 Accumulator 1
SI Field
SI field specifies when the conditional branch qualifier
instruction should be interpreted as a software interrupt
instruction.

Table A-14. SI Field

SI Operation
0 Not a software interrupt
1 Software interrupt
SRC2 Field
SRC2 field specifies operands in an F3 ALU instruc-
tion.

Table A-15. SRC2 Field

SRC2 Operands
00 aSl, IM16
10 aSh, IM16
01 aS, aT
11 aS, p
Lucent Technologies Inc.
DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR
(continued)
T Field
T-field specifies the type of instruction.

Table A-16. T-Field

T Operation
0000x goto JA
00010 short imm j, k, rb, re
00011 short imm r0, r1, r2, r3
00100 Y = a1[l]
00101 Z : aT[l]
00110 Y
00111 aT[l] = Y
01000 bit0 = 0, aT = R
01000 bit0 = 1, aTl = R
01001 bit10 = 0, R = a0
01001 bit10 = 1, R = a0l
01010 R = IM16
01011 bit10 = 0, R = a1
01011 bit10 = 1, R = a1l
01100 Y = R
01101 Z : R
01110 do, redo
01111 R = Y
1000x call JA
10010 ifc CON
10011 if CON
10100 Y = y[l]
10101 Z : y[l]
10110 x = Y
10111 y[l] = Y
11000 bit0 = 0, branch indirect
11000 bit0 = 1, F3 ALU
11001 y = a0 x = X
11010 Conditional branch qualifier
11011 y = a1 x = X
11100 Y = a0[l]
11101 Z : y x = X
11110 bit5 = 0, F4 ALU (BMU)
11110 bit5 = 1, direct addressing
11111 y = Y x = X
† These instructions are not available in DSP16A.
Instruction Encoding
Format
4
9
9
F1 1
F1 2a
F1 1
F1 1a
7
†
7
7
†
7
8
7
†
7
7
7
10
7
4
F2 3
F2 3
F1 1
F1 2
F1 1
F1 1
5
†
3a
F1 1
6
F1 1
F1 1
F1 2
†
3b
9a
F1 1
A-9