Acer Travelmate 7300 Service Guide
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Page 91
2-34Service Guide Table 2-3 NM2160 Pin Descriptions NumberPin nameI/ODescription 108 FPBACK O Flat Panel Backlight This is used to control the backlight power to the panels or as a General Purpose Output Pin as defined by register CR2F bits 3&2 7 6 5 4 3 2 176 174 172 171 170 169 18 17 16 15 14 13 117 118 119 120 121 122 123 124 126 127 128 129 130 131 135 137 139 140PDATA35 PDATA34 PDATA33 PDATA32 PDATA31 PDATA30 PDATA29 PDATA28 PDATA27 PDATA26 PDATA25 PDATA24 PDATA23 PDATA22 PDATA21 PDATA20 PDATA19...
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Major Chips Description 2-35 Table 2-3 NM2160 Pin Descriptions NumberPin nameI/ODescription 96 B O (Analog)BLUE This DAC analog output drives the CRT interface 101 REXT I (Analog)DAC Current reference This pin is used as a current reference by the internal DAC. Please refer to the NM2160 system schematics for the external circuit TV interface 79 CSYNC O T/SComposite Sync This output is the composite synchronization signal for RGB-to-NTSC or PAL/SECAM External Analog Encoders 74 NTSC_PAL O...
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2-36Service Guide Table 2-3 NM2160 Pin Descriptions NumberPin nameI/ODescription 167 166 165 164 163 162 161 160UV7 UV6 UV5 UV4 UV3 UV2 UV1 UV0I Chrominance Data 7:0 These are the 8-bits of chrominance data that are input to the ZV port of NM2160 159 158 155 152 151 150 149 148Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0I Luminance Data 7:0 These are the 8-bits of luminance data that are input to the ZV port of NM2160 144 HREF I Horizontal Synchronization Pulse: This input signal provides the horizontal synchronization pulse...
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Major Chips Description 2-37 Table 2-3 NM2160 Pin Descriptions NumberPin nameI/ODescription 136, 154, 173DVSS DRAM ground 105 AVSSM Analog ground for MCLK synthesizer 104 AVSSV Analog ground for VCLK synthesizer 99 AVSSR1 Analog ground for DAC 100 AVSSR2 Analog ground for DAC current reference 91 AVSSX1 Analog ground for crystal oscillator 25, 42, 57, 78HVDD Host bus interface VDD.(+5v or +3v) Includes the PCI, VL, CRT, Power management, External clock pins(PMCLKI and PVCLKI) and Miscellaneous pins...
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2-38Service Guide 2.4 NMA1 NMA1 is a single audio chip that integrates OPL3 FM and its DAC, 16bit Sigma-delta CODEC, MPU401 MIDI interface, and a 3D enhanced controller including all the analog components which is suitable for multi-media application. This LSI is fully compliant with Plug and Play ISA 1.0a, and supports all the necessary features, i.e. 16bit address decode, more IRQs and DMAs in compliance with PC’96. This LSI also supports the expandability, i.e. Zoomed Video and Modem interface in a...
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Major Chips Description 2-39 2.4.2 Block Diagram Figure 2-4 NMA1 Block Diagram
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2-40Service Guide 2.4.3 Pin Diagram Figure 2-5 NMA1 Pin Diagram
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Major Chips Description 2-41 2.4.4 Pin Descriptions Conventions used in the pin description types: I+: Input Pin with Pull up Resistor T: TTL-tri-state output pin Schmitt: TTL-Schmitt input pin O+: Output Pin with Pull up Resistor Table 2-4 NMA1 Pin Descriptions Pin nameNumberI/ODescription ISA bus interface: 36 pins D7-0 8 I/O Data Bus A15-0 12 I Address Bus AEN 1 I Address Bus Enable /IOW 1 I Write Enable /IOR 1 I Read Enable RESET 1 I Reset IRQ3,5,7,9,10,11 6 T Interrupt request DRQ0,1,3 3 T DMA...
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2-42Service Guide Table 2-4 NMA1 Pin Descriptions Pin nameNumberI/ODescription ADFLTR 1 Right input filter VOCOL 1 O Left voice output VOCOR 1 O Right voice output VOCIL 1 I Left voice input VOCIR 1 I Right voice input Miscellaneous pins: 14 pins SYEN 1 I External synthesizer enable input SYCS 1 O External synthesizer chip select output SYCLK 1 I External synthesizer clock input or ZV clock input SYLR 1 I External synthesizer L/R clock input or ZV L/R clock input SYIN 1 I External synthesizer data input...
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Major Chips Description 2-43 2.5 Philips 87C552 System Management Controller The 87C552 Single-Chip 8-Bit Microcontroller is manufactured in an advanced CMOS process and is a derivative of the 80C51 microcontroller family. The 87C552 has the same instruction set as the 80C51. The 87C552 contains a 8kx8 a volatile 256x8 read/write data memory, five 8-bit I/O ports, one 8-bit input port, two 16-bit timer/event counters (identical to the timers of the 80C51), an additional 16-bit timer coupled to capture...