Altera Video and Image Processing Suite Manuale Utente Pagina 96

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Address Register Description
1 Status
Bit 0 of this register is the Status bit.
This bit is asserted when the CVI IP core is producing
data.
Bits 5, 2, and 1 of the Status register are unused.
Bits 6, 4, and 3 are the resolution valid bits.
When bit 3 is asserted, the SampleCount register is
valid.
When bit 4 is asserted, the F0LineCount register is
valid.
When bit 6 is asserted, the F1LineCount register is
valid.
Bit 7 is the interlaced bit:
When asserted, the input video stream is interlaced.
Bit 8 is the stable bit:
When asserted, the input video stream has had a
consistent line length for two of the last three lines.
Bit 9 is the overflow sticky bit:
When asserted, the input FIFO has overflowed. The
overflow sticky bit stays asserted until a 1 is written to
this bit.
Bit 10 is the resolution bit:
When asserted, indicates a valid resolution in the
sample and line count registers.
2
Interrupt Bits 2 and 1 are the interrupt status bits:
When bit 1 is asserted, the status update interrupt has
triggered.
When bit 2 is asserted, the stable video interrupt has
triggered.
The interrupts stay asserted until a 1 is written to these
bits.
3 Used Words The used words level of the input FIFO.
4 Active Sample Count The detected sample count of the video streams excluding
blanking.
5 F0 Active Line Count The detected line count of the video streams F0 field
excluding blanking.
6 F1 Active Line Count The detected line count of the video streams F1 field
excluding blanking.
UG-VIPSUITE
2015.05.04
Clocked Video Interface Control Registers
4-37
Clocked Video Interface IP Cores
Altera Corporation
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