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STPC12 Datasheet(PDF) 86 Page - STMicroelectronics |
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STPC12 Datasheet(HTML) 86 Page - STMicroelectronics |
86 / 111 page 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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