18
2-Bit, Dual Row, 64 Sample Configuration
Dual 2 x 64 correlators require only one HSP45256. To
initialize the correlator, all the reference bits, control bits,
the delay value of the variable delay, and the window
configuration must be specified. Table 13 details the
settings for the 2-bit Dual Row, 64 Sample Configuration.
In this example, each of the dual correlators compares 2-bit
data to a 1-bit reference. It will take 64 load pulses
(RLOAD/CLOAD) to completely load the reference and
mask registers in the array. The programmable delay must
be set to 0 for the output of the two correlators to be aligned.
7
6
5
4
3
2
1
0
REF <7>
DATA <7>
CSA = 2(CO7+CO6)+CO5+CO4); (CASOUT)
REF <3>
DATA <3>
DATA <5>
DATA <1>
DATAOUT <7>
DATAOUT <5>
DATAOUT <3>
DATAOUT <1>
CSB = 2(CO3+CO2)+CO1+CO0); (AUXOUT)
FIGURE 18. 2-BITS, 1 ROW OF 64 TAPS
TABLE 13. REGISTER LOADING FOR DUAL 2 X 64 CORRELATORS WITH EQUAL WEIGHTING
AO-2
DCONT0-7
NOTES
001
00010110
Dual correlators: Each 2 bit data, 64 taps; reference register for correlation A is loaded from DREF7 and DREF5, the
reference register for correlator B is loaded from DREF3 and DREF1. Correlator #1 = 2x C07 + 2 x CO6 + CO5 + CO4,
correlator #2 = 2 x CO3 + 2x CO2 + CO1 + CO0.
010
00000000
Offset Register A = 0000000010000.
011
00010000
100
00000000
Programmable Delay = 0.
101
00000000
Offset Register B = 0.
110
00000000
2-Bit, Dual Row, 32 Sample Configuration
FIGURE 19. 2-BITS, 2 ROWS OF 32 TAPS
4-Bit, Single Row, 32 Sample Configuration
FIGURE 20. 4-BITS, 1 ROW OF 32 TAPS
7
6
5
4
3
2
1
0
REF <7>
DATA <7>
DATAOUT <0>
REF <3>
DATA <3>
REF <2>
DATA <2>
REF <6>
DATA <6>
DATAOUT <2>
DATA <1>
DATAOUT <7>
DATAOUT <5>
DATAOUT <3>
DATAOUT <1>
DATA <0>
CSA = 2(CO7+CO6)+CO5+CO4); (CASOUT)
CSB = 2(CO3+CO2)+CO1+CO0); (AUXOUT)
DATAOUT <6>
DATAOUT <4>
DATA <5>
DATA <4>
7
6
5
4
REF <7>
DATA <7>
DATAOUT <4>
CSA = 8(CO7)+4(CO6)+2(CO5)+(CO4); (CASOUT)
DATAOUT <5>
DATA <5>
DATAOUT <7>
DATAOUT <5>
DATA <4>
DATA <6>
3
2
1
0
REF <3>
DATA <3>
DATAOUT <0>
CSB = 8(CO3)+4(CO2)+2(CO1)+(CO0); (AUXOUT)
DATAOUT <2>
DATA <1>
DATAOUT <3>
DATAOUT <1>
DATA <0>
DATA <2>
HSP45256