ADV8005 Hardware Reference Manual
UG-707
Figure 142: NEW_AVI_INFO_RAW and NEW_AVI_INFO_ST Timing
All raw bits have corresponding status bits. The status bits always work in the same manner whether the raw bit is edge or level-sensitive. Status
bits have the following characteristics:
•
Enabled by setting the corresponding interrupt mask bit
•
Always latched and must be cleared by the corresponding clear bit
For a given interrupt; when the interrupt mask bit is set, the interrupt status bit goes high and an interrupt is generated on the INT2 pin if the
interrupt raw bit changes state. To return the interrupt status bit to low, the interrupt clear bit must be set. The status bits, interrupt mask bit and
clear bits for level_sensitive_int and edge_sensitive_int are described here for completeness.
level_sensitive_int_st
, IO,
Address 0xXX (Read Only)
This readback indicates the latched status of the level_sensitive_int_raw signal. This bit is only valid if enabled via the corresponding INT1
interrupt mask bit. Once set, this bit remains high until the interrupt is cleared level_sensitive_int_clr.
Function
level_sensitive_int_st
Description
0
level_sensitive_int_raw did not change state
1
level_sensitive_int_raw changed state
edge_sensitive_int _st
, IO,
Address 0xXX (Read Only)
This readback indicates the latched status for edge_sensitive_int_raw. This bit is only valid if enabled via the corresponding INT1 interrupt
mask bit. Once set, this bit remains high until the interrupt is cleared via edge_sensitive_int_clr.
Function
edge_sensitive_int_st
Description
0
edge_sensitive_int_raw not changed state
1
edge_sensitive_int_raw changed state
level_sensitive_int_clr
, IO,
Address 0xXX (Self-Clearing)
This control is used to clear the level_sensitive_int_st bits. This is a self clearing bit.
Function
level_sensitive_int_clr
Description
0
No function
1
Clear level_sensitive_int_st
AVI InfoFrame with
new content detected
New AVI InfoFrame
Detection Internal
Pulse Flag
NEW_AVI_INFO_RAW
NEW_AVI_INFO_ST
NEW_AVI_INFO_CLR
set to 1
Time taken by the
CPU to clear
NEW_AVI_INFO_ST
Time > 2 xtal
periods
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