Table 12-10 Fcop Cycle Count In Gsm Base Station; Performance Analysis - Motorola DSP56305 User Manual

Filter Co-Processor

Performance Analysis

12.6 PERFORMANCE ANALYSIS
FCOP cycle count calculations are based on the following expressions. Table 12-10 is a
summary of FCOP cycle counts in a GSM base station.
Cycle count for match filter of Non-Oversampled data (Mode 2, FDCM = 0):
( ⋅
2 Fl +
Cycle count for match filter of 2x Oversampled data (Mode 2, FDCM = 1):
( ⋅
2 Fl +
Cycle count for optimized correlation (Mode 3, FDCM = 0):
( ⋅
2 Fl +
Where:
• Fl is the filter length (the number of values in the coefficient memory)
• N is the number of output values generated by FCOP

Table 12-10 FCOP Cycle Count in GSM Base Station

Over-
Burst
sampled
Type
Data
No Normal
No Normal
No Access
No Access
2 x Normal
2 x Normal
2 x Access
2 x Access
12-40
) ( ⋅ ) ⋅
6 + 4 Fl + N
) ( ⋅ ) ⋅
6 + 4 Fl + N
) ( ⋅ ) ⋅
6 + 8 Fl + N
Filter Data
Mode Length
Match Filter 61 x 2
Correlation 26 x 2
Match Filter 36 x 2
Correlation 41 x 2
Match Filter 61 x 2
Correlation 26 x 2
Match Filter 36 x 2
Correlation 41 x 2
DSP56305 User's Manual
( ) (
Fl + 2 = N + 6
( ) (
Fl + 4 = N + 6
( ) (
Fl + 1 = N + 10
Filter No. of
Length Outputs
(Fl) (N)
9 x 2 61
26 52 x 2
9 x 2 36
41 82 x 2
9 x 2 61
26 52 x 2
9 x 2 36
41 82 x 2
) ⋅ ( ) 6
Fl + 2 –
) ⋅ ( ) 18
Fl + 4 –
) ⋅ ( ) 4
Fl + 1 –
No. of Duration
Cycles @80MHz
16.75 µs
1340
38.5 µs
3078
10.5 µs
840
91.5 µs
7308
18.5 µs
1474
38.5 µs
3078
11.6 µs
924
91.5 µs
7308
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