Sony HXC-100 Service Manual page 20

System Control Block
SY-363 Board
This board comprises a CPU, peripheral devices, interfaces, a sync separator circuit, a video amplifi er,
and a audio circuit.
CPU and Peripheral Devices
The CPU runs on the program stored in the fl ash memory (IC118, IC119).
The program can be upgraded with a Memory Stick through the Memory Stick controller (IC128).
The SY-363 board also comprises SRAM chips (IC122, IC123) and a FRAM chip (IC127) to record
system setup data and other data.
The CPU's serial communication port is used to control the CCD block, and serial lens.
The analog input ports (AN0 to AN7) are used to read analog lens signals (Iris, Focus, Zoom, and Extend-
er), temperatures of the CCD and boards, and audio volume.
The CPU's external bus (IC109, IC114, and IC125) is used to control the video signal processing LSI and
PLD on the DPR-298 board and the communication LSI and PLD on the CD-61 board through the
MB-1125 board.
In addition to these, this board is provided with a calendar function RTC (IC108). BT101 and C118
function as the RTC backup power supply.
700 Protocol Communication
IC145 performs 700 protocol communication between the camera and the REMOTE connector of the
CCU. Data to be sent for communication with the CCU is multiplexed on the CD-61 board, and is then
sent to the CCU. The REMOTE connector is shared with TRUNK, which are switched by the AT-PLD.
AT-PLD (IC151)
The AT-PLD is a PLD to control external inputs/outputs and the internal devices of the unit. The AT-PLD
has the following functions.
. I2C communication and 3-wire serial communication with the CCD block
. I2C communication with the viewfi nder and tally output
. I2C communication with the front boards
. Inputs of rear panel switches, handle switch, and two rotary encoders
. Tally output to the handle and TRACKER connector
. D/A converter output for lens iris control
. CPU's V interrupt control
. Communication with the character generator on the DPR-298 board
. Fan speed detection
. Monitoring PLD and power status on each board
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HXC-100/V1 (E)