Lucent Technologies DSP1611, Information Manual, Page: 384 / 443

DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR Information Manual
Instruction Set Summary April 1998
B-3
DRAFT COPY
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if CON goto/call/return
(conditional branch qualifier)
test CONdition;
if true, execute the following control statement
The condition CON is tested (encoded in the CON field). If the condition is true, the next instruction (which must be
a control instruction) is executed. If false, the control instruction is not executed.
The ensuing control opcode can be any of the following:
goto JA goto pt call JA call pt return (goto pr)
Note: ireturn and icall are the only control instructions that cannot be conditionally executed.
Table B-1. CON Field Encoding
CON Flag CON Flag
00000 mi (negative result) 10000 gt (result > 0)
00001 pl (positive result) 10001 le (result
≤
0)
00010 eq (result = 0) 10010 allt (all BIO bits true)
00011 ne (result
≠
0) 10011 allf (all BIO bits false)
00100 lvs (logical overflow set) 10100 somet (some BIO bits true)
00101 lvc (logical overflow clear) 10101 somef (some BIO bits false)
00110 mvs (math. overflow set) 10110 oddp (BMU odd parity result)
00111 mvc (math. overflow clear) 10111 evenp (BMU even parity result)
01000 heads (random bit set) 11000 mns1 (BMU minus 1 result)
01001 tails (random bit clear)
†
† The random bit used is updated after each test of heads or tails.
11001 nmns1 (BMU not minus 1 result)
01010 c0ge (counter0
≥
0)
‡
‡ Using the c0ge or c0lt conditions causes the value of the c0 counter to be postincremented. Using the c1ge or c1lt condi-
tions also causes the value of the c1 counter to be postincremented.
11010 npint (JTAG handshake)
01011 c0lt (counter0 < 0)
‡
11011 njint
01100 c1ge (counter1
≥
0)
‡
11100 lock (DSP1627/28/29 only)
ebusy (DSP1618 only)
01101 c1lt (counter1 < 0)
‡
11101 ebusy (DSP1628 only)
01110 true (always) 11110 Reserved
01111 false (never) 11111 Reserved
Bit 15 14 13 12 11 10 9 8 7 6 5 4—0
Field word 1 1 1 0 1 0 0 0 0 0 0 0 CON
word 2 CONTROL OPCODE
Words: 1 (not including the control statement)
Cycles: 3 (including the branch/call/return)
Group: Control
Addressing: None
Flags affected: None
Interruptible: No
Cacheable: No
Format: 6