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CS4237B Datasheet(PDF) 12 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 12 Page - Cirrus Logic |
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12 / 114 page  GENERAL DESCRIPTION This device is comprised of six physical devices along with Plug-and-Play support for two addi- tional external devices. The internal devices are: Windows Sound System Codec Sound Blaster Pro Compatible Interface Game Port (Joystick) Control MPU-401 FM Synthesizer The two external devices are: IDE CDROM Modem A full ISA interface with Plug and Play compati- bility and an External Peripheral Port for interfacing to external devices (i.e. Wave-Table Synthesizer, CDROM, and Modem) is included. Since the Wave-Table Synthesizer and CDROM analog inputs are external, mapping as shown in Figure 5, on page 58, must be used to maintain Sound Blaster compatibility, i.e. CDROM analog must be connected to the AUX2 analog inputs of the mixer. On power up, this part requires a RESDRV sig- nal to initialize the internal configuration. When initially powered up, the part is isolated from the bus, and each device supported by the part must be activated via software. Once activated, each device responds to the resources given (Address, IRQ, and DMA channels). The eight devices listed above are grouped into six logical devices, as shown in Figure 1 (bracketed features are sup- ported, but typically not used). The six logical devices are: LOGICAL DEVICE 0: Windows Sound System Codec (WSS Codec) Adlib/Sound Blaster-compatible Synthesizer Sound Blaster Pro Compatible Interface LOGICAL DEVICE 1: Game Port LOGICAL DEVICE 2: Control LOGICAL DEVICE 3: MPU401 LOGICAL DEVICE 4: CDROM LOGICAL DEVICE 5: Modem Logical Device 0 consists of three physical de- vices. The WSS Codec and the Synthesizer are grouped together since the original Windows Sound System board expected an FM synthesizer if the codec was present. The Sound Blaster Pro Compatible interface, SBPro, is also grouped to allow the WSS Codec and the SBPro to share Interrupts and DMA channels. The Synthesizer device could be the internal FM synthesizer, or a synthesizer externally located on the Peripheral Port. The external synthesizer interface supports both FM and wavetable synthesizers such as the CS9233. The WSS Codec, FM synthesizer, and the SBPro compatible devices are internal to the part. Logical Device 1 is the Game Port that supports up to two joystick devices. Logical Device 2 is the Control device that sup- ports global features of the part. This device uses I/O locations to control power management, joystick rate, and PnP resource data loading. Logical Device 3 is the MPU-401 interface. The MPU-401 MIDI interface includes a 16-byte FIFO for data transmitted out the MIDOUT pin and a 16-byte FIFO for data received from the MIDIN pin. Logical Device 4 supports an IDE CDROM con- nected to the peripheral port. This interface, on the external peripheral port, can support CDROMs with up to 8 I/O locations and sup- ports both the base address and the alternate base address, an interrupt, and a DMA channel. Al- though this logical device is listed as a CDROM, any external device that fits within the resources listed above may be substituted. DS213PP4 CS4237B 12 |
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Similar Description - CS4237B |
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