Pentek 6210 Operating Manual page 39

Pe nt e k Mo del 6210 Oper ating Manual
3.8 Data Format / Signal Path Register
3.8.2
Table 3−10: Model 6210 − Output Data to Motherboard BIFO − Packing Formats
O/P Word # D31 − − − − − − − − − − − − − D20 D19 − D16 D15
(MSB)
1
(MSB)
2
O/P Word # D31 − − − − − − − − − − − − − − − − − − D16
1
2
O/P Word # D31 − − − − − − − − − − − − − − − − − − D16 D15
(MSB)
1
(MSB)
2
O/P Word # D31 − − − − − − − − − − − − − − − − − − D16 D15
1
2
Pack Mode
(continued)
If the DDR is in the 6210's data path between the A/D and the VIM mother−
board (i.e., if D0 in this register is set to the logic '1' state), then the state of this
bit is ignored, and the operating mode of the HSP50214 determines the output
data format (see Appendix
ting the operating mode of the DDR). If the DDR operates in Complex mode,
each 32−bit word delivered from the 6210's DDR to the motherboard BIFO
contains a 16−bit Q (quadrature or imaginary) sample in the upper word (D31
− D16), and a 16 bit I (in−phase or real) sample in the lower word (D15 − D0).
If the DDR operates in Real−Only mode, each 32−bit word delivered from the
6210's DDR to the motherboard BIFO contains only one 16−bit I sample, in the
low word. In all unpacked formats, the data in the upper word is indetermi−
nate.
All data delivered to the motherboard BIFO by the 6210 is in signed 2's com−
plement format, with the MSB of the data sample set to the logic '1' state to
indicate negative data values.
mats for output data from the Model 6210.
Packed A/D Data (D2 = 1, D0 = 0)
A/D Sample #2 (LSB)
A/D Sample #4 (LSB)
Unpacked A/D Data (D2 = 0, D0 = 0)
I n d e t e r m i n a t e
I n d e t e r m i n a t e
Complex DDR Data (D2 = X, D0 = 1)
DDR Q Sample #1
DDR Q Sample #2
Real DDR Data (D2 = X, D0 = 1)
I n d e t e r m i n a t e
I n d e t e r m i n a t e
? ? = I n d e t e r m i n a t e , X = D o n ' t C a r e
(continued)
A, the HSP50214 data
Table 3−10, below, illustrates the available for−
− − − − − − − − − − − − −
(MSB) A/D Sample #1
? ?
(MSB) A/D Sample #3
? ?
D15 − − − − − − − − − − − − −
(MSB) A/D Sample #1
(MSB) A/D Sample #2
− − − − − − − − − − − − − − − −
(LSB) (MSB) DDR I Sample #1
(LSB) (MSB) DDR I Sample #2
− − − − − − − − − − − − − − − −
(MSB) DDR I Sample #1
(MSB) DDR I Sample #2
P age 39
sheet, for details about set−
D4 D3 − D0
(LSB)
(LSB)
D4 D3 − D0
(LSB)
(LSB)
? ?
? ?
??
??
D0
(LSB)
(LSB)
D0
(LSB)
(LSB)
Rev.: C