STPCI2 View Datasheet(PDF) - STMicroelectronics
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Description
Manufacturer
STPCI2 Datasheet PDF : 108 Pages
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STPC® ATLAS
6.3.7. IDE / ISA DYNAMIC DEMULTIPLEXING
Some of the ISA bus signals are dynamically
multiplexed to optimize the pin count. Figure 6-13
Figure 6-13. Typical IDE / ISA Demultiplexing
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.
STPC bus / DD[15:0]
MASTER#
ISAOE#
A
B
74xx245
DIR
OE
RMRTCCS#
KBCS#
RTCRW#
RTCDS
SA[19:8]
LA[20]
PCS1#
) LA[21]
ct(s LA[22]
rodu LA[23]
PCS3#
SCS1#
SCS3#
te P 6.3.8. BASIC AUDIO USING IDE INTERFACE
ole When the application requires only basic audio
s capabilities, an audio DAC on the IDE interface
b can avoid using a PCI-based audio device(see
O Figure 6-14. Basic audio on IDE
Figure 6-14). 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.
t(s) - DD[15:0]
uc PCS1
d PDIOW#
ro PDRQ
solete P SYSRSTO#
16
*
Vcc
Vcc
PR
DQ
Ob Speaker
Q
PR
DQ
Q
D[15:0]
CS#
WR#
A/B
Right
Left
Audio Out
Stereo DAC
RST
RST
STPC
74xx74
Vcc
Note * : the inverter can be removed when the DAC CS# is directly connected to GND
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