Sony CBK-HD01 Maintenance Manual page 17

<USB HOST Controller (IC1500)>
USB HOST Controller exchanged data with the USB
devices such as the flash memory using the interface
compatible with the USB 2.0.
<Ether interface>
Ether interface controls the Ether PHY (IC1/CN-2946
board) and connects to the network via it.
FP-157 board
The FP-157 board has the FP_CPU (IC921) as the sub-
microprocessor and the hardware consists of the synchro-
nous and asynchronous serial communication, I2C commu-
nication bus, and the 8-bit bus. The main function is
controlling the audio system.
Main functions
. Synchronous serial communication
The functions of synchronous serial communication are
the color LCD monitor setting, monochrome LCD
display, audio D/A setting, analog wireless communica-
tion, and the ITORON communication.
. Asynchronous serial communication
Digital wireless communication.
. I2C bus
The rear connector, detection such as PLAY/STOP key,
Info_BATTERY communication, Real Time Clock
communication, Serial EEPROM (Memory) communi-
cation, and I/O control communication make up the 3-
channel I2C bus.
. 8-bit bus
The 8-bit bus controls the serial communication bus
(SDA,SCL) of the 3-channel I2C bus controller (Parallel
bus to I2C_bus Controller).
. CPU I/O
The CPU I/O loads the A/D and controls the I/O port
terminal.
Main blocks
1. Audio mode control
2. AUDIO level indication
3. STOP/PLAY keys control
4. CTL/TC/UBIT control
5. Real Time Clock control
6. WARNING_LED control and alarm tone control
7. Wireless receiver (optional equipment) control
8. Software download function
9. Power supply voltage measuring circuit
10. Info-Battery communication circuit
11. POWER OFF soft control circuit
PDW-700/V1 (E)
12. FP_CPU backup circuit
13. Backup lithium battery voltage measurement circuit
14. Independent operation of FP_CPU
15. REAR input control
16. REAR XLR automatic insertion detection circuit
control (DET-47 board and sensor holder)
17. Color LCD monitor drive control and switching/
rotation detection circuit
18. Nonvolatile memory control
19. Monochrome LCD display circuit with back light
Description of each block
1. Audio mode control
Audio control is performed by receiving the audio mode
information and the menu setup information from the
ITORON (CPU) on the SY-355 board.
The switch information of the three positions is connected
to the AD terminal of the CPU and processed as the AD
signal of the three-valued data.
The audio is switched in the I2C bus PCA-9555 (I/O port:
IC923, 924).
2. AUDIO level indication
The digital signal applied on the DSP is converted to 16
bits and set in the register in DSP.
ITRON (CPU) reads and displays it on the color LCD
monitor. The peak hold time is approx. 1400 ms.
3. STOP/PLAY keys control
Each switch on the KY-623 board is connected to PCA-
9555 for I2C bus to read the ON/OFF information of the
switch and turn on the LED. The switch information is
transferred to ITORON (CPU).
At POWER-ON, the LED of EJECT, F REV, PLAY, F
FWD are turned on, initialized, and turned off.
4. CTL/TC/UBIT control
The switch information of the three positions is connected
to the AD terminal of the CPU and processed as the AD
signal of the three-valued data.
The ON/OFF information of the switches are transferred to
the ITRON (CPU) and displayed on the color LCD
monitor.
5. Real Time Clock control
The Real Time Clock IC (IC908:RX-8025NB) uses
nonadjustable clock for the I2C bus. The accuracy is ± 15
seconds per month. When the power is turned on, the
FP_CPU reads data and send it to ITRON (CPU)
The ITRON (CPU) sends the time data to the Camera CPU
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