- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
236
Serial Data Latch and Incorporation of Data
Fig 12.4-5 Serial Data Latch and Parameter Incorporate Timing
Commands are latched and executed after packets are complete (XCS="H"). However, parameter updates
from register WRITE commands occur after VD latching of the next field. All latching is performed during the
communication prohibited period.
Serial Communication Prohibited Period (Power on/DSP initialization)
Fig 12.4-6 Communication Prohibited Period during CXD3172AR Initialization
Serial communication cannot be received in the initial period (from reset to 10 fields).
Monitor the VD pulse, for example, and wait until the initial period is over.
XCS
Command
latch
Commands reflect
on parameters at the
next VD latch
Command
latch
VD
SIO condition
VD
XCS
1st
command
sending
DSP requires
initializing time
>
10
fields
XRST
DSP(CXD3172AR) Reset 'L' > 500ns
Prohibit Period 1 (DSP initializing)
Undetermined
Active