Acer Extensa 390 Service Guide

Major Chips Description2-75 Table 2-865555 Pin Functions (continued)BallPin NameTypeActiveDescriptionP4,
U14,
U7,
J9-12
K9-12
L9-12
M9-12
Y1RGNDGNDInternal reference GND, should be tied to GNDH4,N4BVCCVCC-Power (Bus Interface), 3.3VU8DVCCVCC-Power (Flat Panel Interface), 3.3VD13
H17
N17MVCCVCC-Power (Memory Interface), 3.3V.U13VVCCVCC-Power (Video Interface), 3.3V.Video InterfaceV16VREFI/OHighVertical reference input for video data port.W17HREFInHighHorizontal reference input for video data...

2-76Service GuideTable 2-865555 Pin Functions (continued)BallPin NameTypeActiveDescriptionB1TD1(MCLKIN)InHighTest data input for boundary scan. Can be
configured to be used as an input for an externally
provided MCLK through a strapping option and
register programming. See the descriptions for
registers XR70 and XRCF for complete detailsC2TDOInHighTest data out for boundary scan.D3TRST#InHighTest reset for boundary scan.Note:TMS, TCLK, TDI, TDO and TRST#, are powered by BVCC and...

Major Chips Description2-77 2.5 M38813
2.5.1 Overview
The M38813M4-XXXHP is an 8-bit single-chip microcomputer created in a silicon gate CMOS
process. Built into this single-chip microcomputer are:
· Serial l/O function (either clock synchronous or UART method selectable in software)
· 8-bit timers
· 8-bit Comparator
· Double Bus interface
The M38813M4-XXXHP is designed as a dedicated microcomputer for Keyboard controller. The
reduced power dissipation of the CMOS process also makes this microcomputer...

2-78Service GuideTable 2-9M38813M4-XXXHP FunctionsParameterFunctionOutput current10mA (15mA for P2
4-P2
7)Operating temperature range
-20 to 85°CDevice structureCMOS silicon gatePackageM38813M4-XXXHP64-pin plastic molded QFP (0.5mm-
lead pitch)2.5.3 Pin Configuration
The Pin configuration of the M38813M4-XXXHP is shown in below.Figure 2-9M38813 Pin Diagram 

Major Chips Description2-79 2.5.4 Pin Descriptions
The pin functions are listed in the table below.
Table 2-10M38813M4-XXXHP Pin DescriptionPinNameFunctionVcc, VssPower supplyPower supply inputs 2.7 to 5.5V to Vcc, and 0V to Vss.CNVssCNVssControls the operating mode of the chip. Normally connected to Vss or Vcc.RESETReset input
To enter the reset state, this pin must be kept L for more than 2ms (under
normal Vcc conditions). If the crystal or ceramic resonator requires more
time to stabilize, extend this...

2-80Service Guide2.5.4.1 Functional Block DiagramFigure 2-10M38813 Block Diagram 

Major Chips Description2-81 2.6 YMF715B-S
YMF715-S (OPL3-SA3) is a single audio chip that integrates OPL3 and its DAC, 16 bit Sigma-delta
CODEC, MPU401 MIDI interface, joystick with timer, 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. 16 bit address decode, more
IRQs and DMAs in compliance with PC96. This LSI also supports the...

2-82Service Guide2.6.2 Pin DiagramFigure 2-11YMF715 Block Diagram 

Major Chips Description2-83 2.6.3 Pin Descriptions
Table 2-11YMF715 DescriptionsPin namePinsI/OTypeSizeFunctionISA bus interface: 36 pinsD7-08I/OTTL24mAData BusAl 1-012ITTL2mAAddress BusAEN1ITTL2mAAddress Bus Enable/IOW1
ISchmitt4mAWrite Enable/IOR1ISchmitt4mARead EnableRESET1ISchmitt4mAResetIRQ3,5,7,9,10,116TTTL12mAInterrupt requestDRQ0,1,33TTTL12mADMA Request/DACK0, 1,33ITTL2mADMA AcknowledgeAnalog Input & Output : 24 sinsOUTL1O--Left mixed analog outputOUTR1O--Right mixed analog outputVREFI1I--Voltage...

2-84Service GuideTable 2-11YMF715 DescriptionsPin namePinsI/OTypeSizeFunctionMP9-0l0I+/OTTL4mARefer to “multi-purpose pins” sectionOthers: 27 pinsGPO - GP34IA--Game PortGP4- GP74I+Schmitt2mAGame PortRXD1I+Schmitt2rnAMIDI Data ReceiveTXD1OTTL4mAMIDI Data Transfer/VOLUP1I+Schmitt2mAHardware Volume (Up)/VOLDWlI+Schmitt2mAHardware Volume (Down)X3311ICMOS2mA33.8688 MHzX33O1OCMOS2mA33.8688 MHzX24I1ICMOS2mA24.576 MHzX24O1OCMOS2mA24.576 MHzAVDD2---Analog Power Supply (put on +5.0V)DVDD3---Digital Power Supply...