HSP50214BVI Intersil, HSP50214BVI Datasheet - Page 57

• Manufacturer Part Number: HSP50214BVI
• Manufacturer: Intersil

Specifications of HSP50214BVI

• Lead Free Status / RoHS Status: Not Compliant

POSITION
POSITION
31-10
31-10
BIT
BIT
CONTROL WORDS 64-95: DISCRIMINATOR COEFFICIENT REGISTERS (SYNCHRONIZED TO PROCCLK)
Discriminator FIR
Coefficient
Programmable FIR
Coefficient
FUNCTION
FUNCTION
CONTROL WORDS 128-255: 255 PROGRAMMABLE COEFFICIENT REGISTERS
57
The discriminator FIR coefficients are 22-bit-two’s complement. If the filter is symmetric, the coefficients
are loaded from the center coefficient at address 64 to the last coefficient. If the filter is asymmetric the
coefficients C
coefficients.
The programmable FIR coefficients are 22-bit-two’s complement. If the filter is symmetric, the
coefficients are loaded from the center coefficient at address 128 to the last coefficient. If the filter is
asymmetric the coefficients C
of asymmetric coefficients.
Real Filters are computed as:
where C0 is the coefficient in address 128 and Xo is the oldest data sample.
Complex filters outputs are computed as follows:
Xn is the most recent data sample.
k is the number of samples = number of (complex) taps.
C0_re is the coefficient loaded into CW128.
C0_im is the coefficient loaded into CW129.
The convolution starts with the oldest data, times the last complex coefficient, and ends with the newest
data, times the first complex coefficient loaded.
Iout
Qout = (Xn-k+1_i * Ck-1_im + Xn-k+1_q * Ck-1_re).
Xn-k+1 Ck1 + Xn-k+2 Ck-2 + ... XnC0),
= (-Xn-k+1_q * Ck-1_im + Xn-k+1_i * Ck-1_re).
+ (-Xn-k+2_q * Ck-2_im + Xn-1+2_i * Ck-2_re).
+ ...
+ (-Xn_q
+ (Xn-k+2_i * Ck-2_im + Xn-1+2_q * Ck-2_re).
+ ...
+ (Xn_i
0
to C
* C0_im + Xn_q
* C0_im + Xn_i
N
HSP50214B
are loaded with C
0
to C
N
are loaded with C
* C0_re).
* C0_re).
0
in address 64 up to 64+N, where N is number of asymmetric
DESCRIPTION
DESCRIPTION
0
in address 128 up to 128+N, where N is number
May 1, 2007
FN4450.4