SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The AF and AEW engines generate an interrupt event at the end of processing each frame. However, these two interrupts are internally tied together so that only one H3A interrupt signal is generated. If the AF engine and AEW engine do not process the same frame concurrently, this should not be an issue. However, if they do run concurrently, one of two outcomes may occur:
The outcome depends on the difference in location of the last paxel/window in the frame (determines when processing is finished), the frequency of the relative clocks in the system, the occurrence and triggering of other interrupts in the system, and the latencies of the context switching and ISR execution.
The VISS_RAWFE_H3A_PCR[15] BUSYAF and/or VISS_RAWFE_H3A_PCR[18] BUSYAEAWB status bits are set when the start of frame occurs (if the VISS_RAWFE_H3A_PCR[0] AF_EN and/or VISS_RAWFE_H3A_PCR[16] AEW_EN bits are 1 at that time). They are automatically reset to 0 at the end of processing a frame. The VISS_RAWFE_H3A_PCR[15] BUSYAF and/or VISS_RAWFE_H3A_PCR[18] BUSYAEAWB status bits may be polled to determine the end of frame status.