Acer Travelmate 7100 Service Guide

Major Chips Description2-33Table 2-3NM2160 Pin DescriptionsPin nameNumberI/ODescription83XCKENI
External Clock Enable This pin is used to select between
internally synthesized clocks or externally supplied clocks. A low
level on the pin selects internal mode and a high level selects
external mode. In the external clock mode, the internal clock
synthesizers will be disabled completely. Both PVCLK and
PMCLK pins should be driven with the desired clock rates in
external mode. This pin should be driven all...

2-34Service GuideTable 2-3NM2160 Pin DescriptionsPin nameNumberI/ODescription143FPVEEO
Flat Panel VEE This is used to control the bias power to the
panels108FPBACKO
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&27
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...

Major Chips Description2-35Table 2-3NM2160 Pin DescriptionsPin nameNumberI/ODescription98RO
(Analog
)RED This DAC analog output drives the CRT interface97GO
(Analog
)GREEN  This DAC analog output drives the CRT interface96BO
(Analog
)BLUE This DAC analog output drives the CRT interface101REXTI
(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 circuitTV interface79CSYNCO
T/SComposite Sync This output is...

2-36Service GuideTable 2-3NM2160 Pin DescriptionsPin nameNumberI/ODescription75ActivityI/O
Activity This pin when in input mode and asserted indicates the
system activity. A high on this pin can be used to reset internal
timers. This pin when in output mode is a General Purpose Output
pin as defined by CR2F bits 5&4, which can be used to control the
IMI chip for reduced EMI82RTC32K/
Status2I/O
Real Time Clock 32Khz/Status2 This pin is used to feed 32 kHz
from an external source. It is used to generate...

Major Chips Description2-37Table 2-3NM2160 Pin DescriptionsPin nameNumberI/ODescription110VGADISI
VGA Disable This pin when active disables all the accesses to
the NM2160 controller, but maintains all the screen refreshes.
GR12 bit-4 enables/disables this feature.
NOTE: When driven by an external source, the swing on this pin
should not be above LVDD11DDC2BDI/O
O/DDDC Data pin12DDC2BCI/O
O/DDDC Clock pinPower pins10, 29, 44,
59, 80, 114,
125, 138,
153VSSPHost bus interface ground, ZV interface ground and...

2-38Service Guide2.4 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...

Major Chips Description2-392.4.2 Block DiagramFigure 2-4NMA1 Block Diagram 

2-40Service Guide2.4.3 Pin DiagramFigure 2-5NMA1 Pin Diagram 

Major Chips Description2-412.4.4 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 2-4NMA1 Pin DescriptionsPin nameNumberI/ODescriptionISA bus interface: 36 pinsD7-08I/OData BusA15-012IAddress BusAEN1IAddress Bus Enable/IOW1IWrite Enable/IOR1IRead EnableRESET1IResetIRQ3,5,7,9,10,116TInterrupt requestDRQ0,1,33TDMA Request/DACK0,1,33IDMA AcknowledgeAnalog...

2-42Service GuideTable 2-4NMA1 Pin DescriptionsPin nameNumberI/ODescriptionADFLTR1Right input filterVOCOL1OLeft voice outputVOCOR1ORight voice outputVOCIL1ILeft voice inputVOCIR1IRight voice inputMiscellaneous pins: 14 pinsSYEN1IExternal synthesizer enable inputSYCS1OExternal synthesizer chip select outputSYCLK1IExternal synthesizer clock input or ZV  clock inputSYLR1IExternal synthesizer L/R clock input or ZV L/R clock inputSYIN1IExternal synthesizer data input or ZV data inputSYCLKO1OExternal...