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CS4237B Datasheet(PDF) 26 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 26 Page - Cirrus Logic |
26 / 114 page ![]() specific E 2PROM data sheet to select the value of the pull-up resistor (a typical value would be 3.3k Ω). Programming the E 2PROM: 1. Configure Control I/O base address by one of two methods: regular PnP cycle or Crystal Key method. a. The host can use the regular PnP cycle to program the logical device 2 I/O base ad- dress, and then place the chip in the wait_for_key_state b. If the Crystal Key method is used: First, write to I/O 0279h, send the 32- byte Crystal key. (The Crystal Key only supports one Crystal part per system.) Second, configure the Control I/O base address by writing 15h, 02h, 47h, 01h, 20h, 33h, 01h, 79h to 0279h. 2. Refer to the specific data sheet for the E 2PROM you are using for timing require- ments and data format. Also, refer to the Loading Resource Data section of this data sheet for the E 2PROM resource data format. 3. Send the E 2PROM data in successive bits to CTRLbase+1 (Hardware Control Register) while following the E 2PROM data sheet for- mat. The E 2PROM now contains the PnP resource data. For this new data to take effect, the part must be reset, causing the part to read the E 2PROM during initialization. Crystal can pro- vide a utility, RESOURCE.EXE, to program E 2PROMs through the Control logical device in- terface. WINDOWS SOUND SYSTEM CODEC The WSS Codec software interface consists of 4 I/O locations starting at the Plug and Play ad- dress ’WSSbase’, and supports 12-bit address decoding. If the upper address bits, SA12-SA15 are used, they must be 0 to decode a valid ad- dress. The WSS Codec also requires one interrupt and one or preferably two DMA chan- nels, one for playback and one for capture. Since the WSS Codec and Sound Blaster device are mutually exclusive, the two devices share the same interrupt and DMA playback channel. The WSS Codec/Mixer is register compatible with the Microsoft Windows Sound System. Functions include stereo Analog-to-Digital and Digital-to-Analog converters (ADCs and DACs), analog mixing, anti-aliasing and reconstruction filters, line and microphone level inputs, optional A-Law/ µ-Law coding, simultaneous capture and playback (at independent sample frequencies) and a parallel bus interface. Five analog inputs are provided and four can be mixed to the ADC mixer. All five can be mixed with the output of the DAC with full volume control. Several data modes are supported including 8- and 16-bit lin- ear as well as 8-bit companded, 4-bit ADPCM compressed, and 16-bit big Endian. Enhanced Functions (MODEs) The initial state is labeled MODE 1 and forces the part to appear as a CS4248. The more popu- lar second mode, MODE 2, forces the part to appear as a CS4231 super set and is compatible with the CS4232. To switch from MODE 1 to MODE 2, the CMS1,0 bits, in the MODE and ID register (I12), should be set to 10 respec- tively. When MODE 2 is selected, the bit IA4 in the Index Address register (R0) will be decoded as a valid index pointer providing 16 additional registers and increased functionality over the CS4248. To reverse the procedure, set the CMS1,0 bits to 00 and the part will resume operation in DS213PP4 CS4237B 26 |
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