If Con F2 - Lucent Technologies DSP1617 Information Manual

Information Manual
April 1998

if CON F2

(if CONdition is true, then perform special function instruction)
test CONdition;
if true, then perform F2
The specified condition is tested. If it is true, the special function operation F2 is performed. (See
page B-3 for the conditions that can be tested, i.e., encoded in the CON field). The F2 functions can also be per-
formed unconditionally, i.e., written by themselves and encoded as a condition of true.
The F2 functions that can be conditionally performed, i.e., encoded in the F2 field, are as follows:
F2 Operation
0000 aD = aS >> 1
0001 aD = aS << 1
0010 aD = aS >> 4
0011 aD = aS << 4
0100 aD = aS >> 8
0101 aD = aS << 8
0110 aD = aS >> 16
0111 aD = aS << 16
Bit 15 14
Field
1 0
Note: The D and S fields are used to specify aD and aS.
Lucent Technologies Inc.
DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR
F2 Operation
1000 aD = p
1001 aDh = aSh + 1
1010 aS = ~aS
1011 aD = rnd(aS)
1100 aD = y
1101 aD = aS + 1
1110 aD = aS
1111 aD = –aS
13 12 11 10
0 1 1 D
Words: 1
Cycles: 1
Group: Special Function
Addressing: Register
Flags affected: LMI, LEQ, LLV, LMV
Interruptible: Yes
Cacheable: Yes
Format: 3
DRAFT COPY
9 8—5
S F2
Instruction Set Summary
Table B-1 on
4—0
CON
B-18