Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S37CIRCUIT DESCRIPTIONFig. 43 Digital control circuitEther PHY ICIC601USB transceiverIC502/IC503High side SWIC501DVI transmitterIC401Video DACIC402USB 3ch HUBIC701USB audioIC703USB to UARTbridgeIC702NAND flashIC8DDR2IC2/IC3NAND flashIC208DDR2IC202/IC203Clock circuitIC209DAC ICIC6ADC ICIC725MHzX60124MHzX70112MHzX702RJ-45J601SRXDSPMainMCU26MHzX126MHzX20112.288MHzX202To Main display(7inch 800×480)To Sub display(3.5inch 320×240)Main MCUScope DSPPanel MCUBuffer ICIC651/IC652/IC653FrontPanelUSB-ADVI-IJ401RearUSB-BJ701Sub application MCUIC201UARTMain application MCUIC1RMII6pin SerialUARTUARTSPI10. Digital Control Circuit10-1. OutlineThe digital unit (X46-339) mainly consists of two applica-tion MCUs (IC1 and IC201). IC1 mainly controls the maindisplay 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 PeripheryThe main application MCU (ICI) and sub applicationMCU (IC201) are the same in basic configuration. The clockfrequency is 26MHz and the internal operating frequencyis 600MHz. As for the memory configuration, 2G-bit NANDflash memories (IC8 and IC208) for program storage and1G-bit DDR2 memories (IC2/IC3 and IC202/IC203) for pro-gram computation are incorporated.Two application MCUs are in UART communication at abaud rate of 3,686,400 bps. Three types of supply voltagesin five systems are used, i.e., 1.8 V (for the DDR controllersystem), 3.3 V (for the I/O system), 1.2 V (for the core), 1.8V (for others), and 3.3 V (for the USB system), and started inthe sequence shown in Fig. 44.Fig. 44 Power supply voltage of the application MCUDDR controller systemI/O systemCore1.8V (for others)USB system1.8V3.3V1.2V1.8V3.3V10-3. Communication with the Main MCUThe application MCU is basically operated by commandsfrom the main MCU (IC46) of the control unit (X53-452).These commands are transmitted in UART communicationat a baud rate of 115,200 bps.10-4. Communication with the Scope DSPScope image data displayed on the main display and subdisplay is received by both IC1 and IC201 from the scopeDSP (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 MCUCoordinate data on the scope screen of the main displayis received through the panel MCU (IC6) of the display unit(X54-385). The transfer baud rate is 115,200 bps.10-6. LAN Interface CircuitThe 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 theEthernet PHY IC (IC601), and the transformer-built-in RJ-45connector (IC601). The MAC interface communicates overRMII.