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STPC12 Datasheet(PDF) 86 Page - STMicroelectronics

Part # STPC12
Description  X86 Core PC Compatible System-on-Chip for Terminals
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPC12 Datasheet(HTML) 86 Page - STMicroelectronics

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DESIGN GUIDELINES
86/111
Issue 1.0 - July 24, 2002
6.3.7. IDE / ISA DYNAMIC DEMULTIPLEXING
Some of the ISA bus signals are dynamically
multiplexed to optimize the pin count. Figure 6-13
describes how to implement the external glue
logic to demultiplex the IDE and ISA interfaces. In
Local Bus mode the two buffers are not needed
and the NAND gates can be simplified to inverters.
6.3.8. BASIC AUDIO USING IDE INTERFACE
When the application requires only basic audio
capabilities, an audio DAC on the IDE interface
can avoid using a PCI-based audio device. This
low cost solution is not CPU consuming thanks to
the DMA controller implemented in the IDE
controller and can generate 16-bit stereo sound.
The clock speed is programmable when using the
speaker output.
Figure 6-13. Typical IDE / ISA Demultiplexing
MASTER#
74xx245
RMRTCCS#
A
B
DIR
OE
ISAOE#
KBCS#
RTCRW#
RTCDS
SA[19:8]
STPC bus / DD[15:0]
LA[24]
LA[25]
LA[22]
LA[23]
SCS1#
SCS3#
PCS1#
PCS3#
Figure 6-14. Basic audio on IDE
74xx74
16
Q
Q
DD[15:0]
D
PR
RST
D[15:0]
CS#
PCS1
WR#
A/B
Audio Out
Right
Left
Stereo DAC
PDRQ
SYSRSTO#
Speaker
PDIOW#
Vcc
Vcc
Vcc
STPC
Q
Q
D
PR
RST
Note * : the inverter can be removed when the DAC CS# is directly connected to GND
*


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