5.3. Reset Circuit
Reset circuit using for initiliazing main Mstar IC. Reset condition is high and nomal
working condition is low for RESET pin.
6. CI INTERFACE
CI Interface Power Switch:
It is used for CI module supply, when Module is inserted (it means CI detect is low) This
circuit is opened or closed by CI_POWER_CTRL port of main uController
7. USB INTERFACE
Main Concept IC has integrated 2 USB 2.0 interface. One of them is used for ethernet
function, the other one is used for USB connectivity for last user. Last user can play video,
picture and audio files. Also digital channels can be record to externall storage device by
this interface. All SW files can be updated with interface.
USB circuit has 3 main parts
Integrated USB 2.0 Host interface of D3K (U5)
Protection IC (U145)
Over Curent Protection IC (U8)