Motorola DSP56305 User Manual page 505

Table 13-12 Variables for Calculating Processing Time
• Total processing time for equalization (T
• Total processing time for decoding (T
Note that:
• The reset time is negligible.
• The setup time is small but variable – about 80 cycles for equalization, and about
40 cycles for decoding.
The equations for processing time are derived from the following:
• Total processing time (T
T
TotalProcess
• Time to perform one stage (T
MOTOROLA
Symbol Number Meaning
L Bits_Left_in_Buffer
F Clock_Frequency
2 S P ( ( 1 )
+
T = ------------------------------------------------------ -
eq
):
d
2 S P ( ( 1 )
+
T = ------------------------------------------------------ -
d
):
TotalProcess
(
= Bits_to_Process +
):
stage
T = Trellis_States
stage
DSP56305 User's Manual
VITERBI CO-PROCESSOR
):
eq
) 704
+ L +
F
)
+ L + 576
F
) T ×
1 + T +
stage flush
T
× acs
--------- -
2
Performance Analysis
T
readbuff
13-35