Compal Electronics Inc PICONODE Manual De Usuario
PicoNode Integration Specification
20
5.7 Host MRQ Release/picoNode Allowed to Sleep Sequence
If the Host determines there are no more messages or SPI transactions required, it nominally de-
asserts the MRQ to allow the picoNode to fall back to Deep Sleep (lowest power mode). The
figure below shows how this is sequenced by the Host/picoNode. A small delay in de-asserting
SRDY is enforced to prevent quick toggling (waking) of the picoNode.
asserts the MRQ to allow the picoNode to fall back to Deep Sleep (lowest power mode). The
figure below shows how this is sequenced by the Host/picoNode. A small delay in de-asserting
SRDY is enforced to prevent quick toggling (waking) of the picoNode.
NOTE: The timing shown in the figure is not to scale.
t
0
t
1
t
2
SRDY
SPI
System
MRQ
Hi-Z
10 ms
3 ms
Figure 7 Host MRQ Release/picoNode Allowed to Sleep Sequence