Updatemlse Instruction With Hard Decision; Table 14-7. Representative Updatemlse Instruction Cycles (Sh = 1) - Lucent Technologies DSP1617 Information Manual

Information Manual
April 1998
14.6 ECCP Instruction Timing

14.6.3 UpdateMLSE Instruction with Hard Decision

The generic formula for the computation of the UpdateMLSE instruction cycles with hard decision (i.e., SH = 1) is
as follows:
(
UpdateMLSE SH
where CL represents the value of the constraint length field in the ECON register and TBLR is the traceback length
value programmed into the TBLR register.
instruction cycles for different values of CL and TBLR. For the UpdateMLSE instruction, CL has a maximum value
of four corresponding to constraint length 6.

Table 14-7. Representative UpdateMLSE Instruction Cycles (SH = 1)

CL
0
0
0
0
0
1
1
1
1
1
2
2
2
2
2
3
3
3
3
4
For the UpdateMLSE instruction with hard decision, the traceback length register can be programmed to a maxi-
mum value of 63.
Lucent Technologies Inc.
DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR
(continued)
)Cycles
= 1 = 15 + 2
Table 14-7
TBLR
1—7
8
9
10
11
1—11
12
13
14
15
1—19
20
21
22
23
1—35
36
37
38
1—63
DRAFT COPY
Error Correction Coprocessor (DSP1618/28 Only)
Max 0 [ TBLR 2 (
( )
CL + 2 + ,
–
shows some representative values for the UpdateMLSE
Cycles
19
20
21
22
23
23
24
25
26
27
31
32
33
34
35
47
48
49
50
79
[ ] 4
( ) ( )
CL + 2 CL 3
+ Max 1 2 , –
) ]
–
14-21