TS-990S
37
CIRCUIT DESCRIPTION
Fig. 43 Digital control circuit
Ether PHY IC
IC601
USB transceiver
IC502/IC503
High side SW
IC501
DVI transmitter
IC401
Video DAC
IC402
USB 3ch HUB
IC701
USB audio
IC703
USB to UART
bridge
IC702
NAND flash
IC8
DDR2
IC2/IC3
NAND flash
IC208
DDR2
IC202/IC203
Clock circuit
IC209
DAC IC
IC6
ADC IC
IC7
25MHz
X601
24MHz
X701
12MHz
X702
RJ-45
J601
SRX
DSP
Main
MCU
26MHz
X1
26MHz
X201
12.288MHz
X202
To Main display
(7inch 800×480)
To Sub display
(3.5inch 320×240)
Main MCU
Scope DSP
Panel MCU
Buffer IC
IC651/IC652/IC653
Front
Panel
USB-A
DVI-I
J401
Rear
USB-B
J701
Sub application MCU
IC201
UART
Main application MCU
IC1
RMII
6pin Serial
UART
UART
SPI
10. Digital Control Circuit
10-1. Outline
The digital unit (X46-339) mainly consists of two applica-
tion MCUs (IC1 and IC201). IC1 mainly controls the main
display and external monitor output system (7-inch LCD,
IC401, and IC402), USB host transceiver (IC502 and IC503),
and Ethernet PHY IC (IC601) while IC201 is mainly in con-
trol of the sub display (3.5-inch LCD).
10-2. Application MCU and Its Periphery
The main application MCU (ICI) and sub application
MCU (IC201) are the same in basic confi guration. The clock
frequency is 26MHz and the internal operating frequency
is 600MHz. As for the memory confi guration, 2G-bit NAND
flash memories (IC8 and IC208) for program storage and
1G-bit DDR2 memories (IC2/IC3 and IC202/IC203) for pro-
gram computation are incorporated.
Two application MCUs are in UART communication at a
baud rate of 3,686,400 bps. Three types of supply voltages
in fi ve systems are used, i.e., 1.8 V (for the DDR controller
system), 3.3 V (for the I/O system), 1.2 V (for the core), 1.8
V (for others), and 3.3 V (for the USB system), and started in
the sequence shown in Fig. 44.
Fig. 44
Power supply voltage of the application MCU
DDR controller system
I/O system
Core
1.8V (for others)
USB system
1.8V
3.3V
1.2V
1.8V
3.3V
10-3. Communication with the Main MCU
The application MCU is basically operated by commands
from the main MCU (IC46) of the control unit (X53-452).
These commands are transmitted in UART communication
at a baud rate of 115,200 bps.
10-4. Communication with the Scope DSP
Scope image data displayed on the main display and sub
display is received by both IC1 and IC201 from the scope
DSP (IC380) of the control unit in serial peripheral interface
(SPI) mode. The transfer baud rate is 2,073,600 bps.
10-5. Communication with the Panel MCU
Coordinate data on the scope screen of the main display
is received through the panel MCU (IC6) of the display unit
(X54-385). The transfer baud rate is 115,200 bps.
10-6. LAN Interface Circuit
The LAN interface of this transceiver supports 100BASE-
TX and 10BASE-T standards, and consists of the MAC func-
tion of the main application MCU (IC1), PHY function of the
Ethernet PHY IC (IC601), and the transformer-built-in RJ-45
connector (IC601). The MAC interface communicates over
RMII.
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