Frame Duration Error Interrupt - Texas Instruments OMAP5912 Reference Manual

Multichannel Serial Interfaces
Figure 40. Transmit Interrupt Timing Diagram
CLK
Channel N-1
T7 T6 T5
TXD
IT_TX
t < 2 x DSPXOR_CK (MHz)
(syn)
INTERRUPT_REG(7:4) = N

Frame Duration Error Interrupt

120 Serial Interfaces
T4 T3 T2 T1 T0 T7
t
(syn)
The frame duration error interrupt is only generated when:
The interface is configured in burst mode (CONTINUOUS = 0).
-
The frame duration is smaller or longer than the expected value.
-
Namely, expected frame duration = [(channels number) * (word size)] +
(over-size number) in clock periods units with over-size number defined in
OVER_SIZE_REG register.
If the frame duration is longer than the expected value, then the interrupt is
generated one clock period after the number of the over_size clock periods,
as defined in OVER_CLOCK parameter.
If the frame duration is smaller than the expected value, then the interrupt is
generated one clock period after the occurrence of the next frame pulse (first
active edge).
T6 T5 T4 T3 T2 T1
Channel N
DSP_WRITE(1) => STATUS_REG(4)
Channel N+1
T0 T7 T6 T5 T4 T3
t
(syn)
SPRU760B
T2 T1 T0