PDSP16340 Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc
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PDSP16340 Datasheet PDF : 14 Pages
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PDSP16340
Complex Time Domain Input
PDSP16520
Data RAM
PDSP16520
Data RAM
Address
Generator
Ar
Br
Ai
PDSP16116 / 318
Butterfly Processor
A'r
B'r
A'i
Bi
GND
SINE
COSINE
M15:0
MEN
XI15:0
PDSP16340
XR15:0
MODE
B'i
+5v
Complex Frequency Domain Result
Fig. 5. Sin / Cos generator for 20 MHz FFT System
The device will replace all incoming values above the
square root of two with the maximum value. The SAT output
indicates when this replacement has internally occurred. The
flag is delayed such that it is valid at the same time as the
output data which was calculated from the saturated input.
DATA FORMATS
When the device is configured in the co-ordinate conver-
sion mode (MODE pin is low), the magnitude (M) input bus can
have one of the following data formats:
BIT NUMBER
WEIGHTING
RANGE = 1
RANGE = 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14
S2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
-1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15
S2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
The sign bit is provided to maintain compatibility with
normal arithmetic procedures, but in most applications the
value will always be positive. The sign bit could then be tied
low, and the lower fifteen bits used to define the input. If a
negative value is used this will introduce a 180° phase shift.
When the MODE pin is high the state of the RANGE pin is
irrelevant, and the magnitude is internally defined to be unity.
The PHASE port has the following data format:
BIT NUMBER
WEIGHTING
in ∏ radians
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15
2222222222222222
Thus, for example :
+90° (= - 270°)
-180° (= +180°)
-90° (= +270°)
= 0100000000000000
= 1000000000000000
= 1100000000000000
The 16 bit radius value is multiplied with the 16 bit
internally generated sine and cosine values, to produce a 16
bit result. The RANGE input controls the format of the output
data as given below:
BIT NUMBER
WEIGHTING
RANGE = 1
RANGE = 0 OR
MODE = 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14
S2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
-1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15
S2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
6
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