B Instruction Set Summary; Goto Ja; Appendix B. Instruction Set Summary - Lucent Technologies DSP1617 Information Manual

DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR
Instruction Set Summary

B Instruction Set Summary

This section explains in detail the instruction set for the DSP1611, DSP1617, DSP1618, DSP1627, DSP1628, and
DSP1629. Refer to Appendix A

goto JA

(branch direct)
(PC) ← (PC bits 15—12)(JA)
Program control jumps to location JA (within the same 4 Kword page). The lower 12 bits of the PC are written with
the 12-bit immediate value of JA. The upper 4 bits of the PC remain unchanged (the goto pt instruction is used for
branches outside the current 4 Kword page).
Bit 15 14
Field
0 0
Note: The goto JA instruction should not be placed in the last or next-to-last instruction before the boundary of a
4 Kword page. If the goto is placed there, the program counter will have incremented to the next page and
the jump will be to the next page, rather than to the desired current page.
B-1
for instruction set formats and field encodings.
13 12
0 0
Words: 1
Cycles: 2
Group: Control
Addressing: Immediate
Flags affected: None
Interruptible: No
Cacheable: No
Format: 4
DRAFT COPY
Information Manual
11—0
JA
Lucent Technologies Inc.
April 1998