DS588 Datasheet, PDF (16/24 Pages) Xilinx, Inc – Programmable interrupt generation

XPS Delta-Sigma Digital to Analog Converter (DAC) (v1.01a)
Table 6: XPS Delta-Sigma DAC Data FIFO Bit Definitions
Bit(s)
Name Core Access
0 to [31 - C_NUM_DAC_BITS -
C_FULL_RANGE]
Reserved
-
[32 - C_NUM_DAC_BITS -
C_FULL_RANGE] to 31
Data
Read/Write
Reset Value
-
Indeterminate
Description
Reserved
DAC Output Data
Data FIFO Occupancy Register (OCCY)
This field contains the occupancy value for the Data FIFO. Reading this register can be used to
determine if the FIFO is empty, also the Data FIFO 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. The bit definitions for the register are shown
in Table 7.
X-Ref Target - Figure 9
Reserved
Occupancy Value
0
26 27
31
DS588_09_100909
Figure 9: Data FIFO Occupancy Register (OCCY)
Table 7: Data FIFO Occupancy Register Bit Definitions
Bit(s)
Name
Access
Reset
Value
Description
0 - 26 Reserved
NA
-
Reserved
27 -31
Occupancy
Value
Read
0x0
Bit 27 is the MSB. A value of "10000" implies that all 16
locations in the FIFO are full.
Data FIFO Programmable Depth Interrupt Register (PIRQ)
This field contains the value which will cause the PIRQ Interrupt to be set. When this value is greater
than or equal to the OCCY value, the PIRQ interrupt will be set and remain set until the equality or
greater than is no longer true. The bit definitions are shown in Table 8.
X-Ref Target - Figure 10
Reserved
Compare Value
0
26 27
31
DS588_10_100909
Figure 10: Data FIFO Programmable Depth Interrupt Register
Table 8: Data FIFO Programmable Depth Interrupt Register Bit Definition
Bit(s)
Name
Access
Reset
Value
Description
0 - 26 Reserved
-
-
Reserved
27 - 31 Compare Value
Read/Write
Bit 27 is the MSB. A value of 00101 implies when
0x0 either five or less than five locations in the Data
FIFO are filled, FIFO PIRQ interrupt will be set.
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DS588 December 2, 2009
Product Specification