NEC MultiSync LCD1920NX User And Service Manual page 92

CIRCUIT DESCRIPTION
TABLE OF CONTENTS
1. Summary .............................................................................................................................. 7-2
2. Circuit description ................................................................................................................ 7-3
2.1 System block diagram ........................................................................................................ 7-3
2.2 Analog signal input circuit .................................................................................................. 7-4
2.3 A/D converter ..................................................................................................................... 7-5
2.4 AM121-2 and peripheral circuits ........................................................................................ 7-7
2.4.1 General description ......................................................................................................... 7-7
2.4.2 AM121-2 internal block diagram ..................................................................................... 7-8
2.4.3 Circuit diagram ................................................................................................................ 7-9
2.4.4 Pin description .............................................................................................................. 7-10
2.4.5 Function description ...................................................................................................... 7-13
2.5 Reset signal generator circuit .......................................................................................... 7-13
2.6 CPU (MTV112MN32) description ..................................................................................... 7-14
2.6.1 CPU internal block ........................................................................................................ 7-14
2.6.2 Features ........................................................................................................................ 7-14
2.6.3 Pin description .............................................................................................................. 7-15
2.6.4 H/V-sync processing ..................................................................................................... 7-16
2.6.5 DDC & IIC interface ...................................................................................................... 7-17
2.7 LVDS description ............................................................................................................. 7-18
2.7.1 Circuit ............................................................................................................................ 7-18
2.7.2 General description ....................................................................................................... 7-19
2.7.3 Function block diagram ................................................................................................. 7-19
2.8 DDC circuit description .................................................................................................... 7-20
2.8.1 Analog circuit ................................................................................................................ 7-20
2.8.2 Digital circuit .................................................................................................................. 7-20
2.8.3 General description ....................................................................................................... 7-20
2.9 Power system circuit and description .............................................................................. 7-21
2.10 Over voltage protection .................................................................................................. 7-22
2.11 TMDS signal process ..................................................................................................... 7-23
2.11.1 Circuit and description ................................................................................................. 7-23
2.11.2 Chip general description ............................................................................................. 7-24
2.11.3 Features ...................................................................................................................... 7-24
2.11.4 Pin description ............................................................................................................. 7-25
2.12 Waveforms ..................................................................................................................... 7-28
7-1
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