Grass Valley 8945EDA v.1.0.0 - Manual (Page 26)

26 8945EDA and 8945EDA-D Instruction Manual
Functional Description
Functional Description
A block diagram of the 8945EDA is shown in Figure 14 .
Figure 14. 8945EDA and 8945EDA-D Block Diagram
Input Processing
The wideband serial SD/ASI or HD signal enters the module from rear BNC J9 or
J10 to an input amplifier. It is then equalized for the specified cable lengths in the
equalizer circuit.
Output Processing
The SDI driver modules feed the outputs. That ensures the rise and fall time adjust-
ment regarding the signal format selection (SD/ASI or HD mode).
Microprocessor
The main functions of the microprocessor include:
• Providing remote control and monitoring capability for the module (through
ethernet),
• Communicating with equalizer IC to monitor signal present status,
• Relaying module status through on-board LEDs, and
• Configuring module components at power up.
Input
Equalizer
HD
format
SD
or
HD
or
ASI
outputs
Core CPU
Control & Command process
_ Configuration
_ Alarming
B
U
F
F
E
R
SDI
Driver
Module
SDI
Driver
Module
SD
or
HD
or
ASI
Local
C&C
S
E
L
E
C
T
O
R
Single mode
Ethernet
Input
Equalizer
B
U
F
F
E
R
SD
or
HD
or
ASI
SD/ASI
8436-05