18
I/O Voltage
Table 3-2
VDD=3.3 V, VSS=0 V, T=23°C
Parameter
Minimum
Maximum
Unit
VIL
-0.3
0.8
V
VIH
2.0
3.6
V
VOL
VSS
0.4
V
VOH
2.4
VDD
V
Timing Sequence
Power Up and Power Down Timing Sequence
Figure 3-1
1. In the diagram above, it takes
A+B
(about 970ms) for the engine to power up:
A
is reset time (about 298ms),
B
is time
needed to start the engine (including bootloader execution, kernel boot and decoding chip initialization). The engine is
ready to receive commands via its serial/USB port after the power-up sequence completes.
2.
C
is the time it takes to power down the engine (during power-down, all voltages in the engine ramp down, with all
communication stopped and all signals at a low level). To ensure that all voltages are fully down and signals on the
interfaces at a low level, the minimum interval between removing and resupplying the power must exceed 700ms.
