DS587 Datasheet, PDF (13/20 Pages) Xilinx, Inc – Selectable ADC resolution

XPS Delta-Sigma Analog to Digital Converter (ADC) (v1.01a)
Table 11: ADCout Data FIFO Bit Definitions
Bit(s)
Name
Core
Access
0 to [32-C_DACIN
Unused
N/A
_WIDTH]
[(32-C_DACIN
_WIDTH)+1] to 31
ADCout
Read
Reset
Value
Description
0 Unused
Digital value equivalent of the input
0
analog sample. The number of bits of
resolution of ADCout is
C_DACIN_WIDTH - 1.
ADCout Data FIFO Occupancy Register (OCCY)
The ADCout Data FIFO Occupancy Register contains the occupancy value of the ADCout Data FIFO.
Reading this register can be used to determine if the FIFO is empty, also the FIFO Non-Empty Interrupt
conveys that information.The value read is the binary count value, therefore reading all zeros implies
that no location is filled and reading "10000" implies that all sixteen locations are filled. Figure 8 shows
the location of Data Occupancy value in the 32-bit wide ADCout Data FIFO Occupancy Register. OCCY
bit definitions are shown in Table 12.
X-Ref Target - Figure 8
Unused
Data Occupancy
0
26 27
31
DS587_08_090809
Figure 8: ADCout Data FIFO Occupancy Register (C_DACIN_WIDTH = 9)
Table 12: ADCout Data FIFO Occupancy Register Bit Definitions
Bit(s)
Name
Core Reset
Access Value
Description
0 to 26
Unused
N/A
0 Unused
27 to 31
Data Occupancy
Read
0
Number of data words currently in
ADCout Data FIFO.
DS587 December 2, 2009
www.xilinx.com
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Product Specification