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CS4237B Datasheet(PDF) 15 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 15 Page - Cirrus Logic |
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15 / 114 page  INTERRUPTS For Plug-and-Play flexibility, six interrupt pins are supported, although only one or two are typi- cally used. The default hardware connections, which can be modified through the hardware configuration data, are: IRQ A = ISA Interrupt 5 IRQ B = ISA Interrupt 7 IRQ C = ISA Interrupt 9 IRQ D = ISA Interrupt 11 IRQ E = ISA Interrupt 12 IRQ F = ISA Interrupt 15 The typical configuration would support two in- terrupt sources: one shared between the WSS Codec and the Sound Blaster Pro compatible de- vices, and the other for the MPU401 device. Interrupts are also supported for the Synthesizer, Control, CDROM devices, but are typically not used. If the modem logical device (LD5) is used, it would typically support an interrupt. PLUG AND PLAY The Plug-and-Play (PnP) interface logic is com- patible with the Intel/Microsoft Plug-and-Play specification, version 1.0a, for an ISA-bus de- vice. Since the part is an ISA-bus device, it only supports ISA-compatible IRQs and DMA chan- nels. Plug and Play compatibility allows the PC to automatically configure the part into the sys- tem upon power up. Plug and Play capability optimally resolves conflicts between Plug and Play and non-Plug and Play devices within the system. Alternatively, the PnP feature can be by- passed. See the Bypassing PnP section for more information. For a detailed Plug-and-Play proto- col description, please refer to the Plug and Play ISA Specification. To support Plug-and-Play in ISA systems that do not have a PnP BIOS or a PnP-aware operating system, the Configuration Manager (CM) TSR and an ISA Configuration Utility (ICU) from In- tel Corp. are used to provide these functions. The CM isolates the cards, assigns Card Select Numbers, reads PnP card resource requirements, and allocates resources to the cards based on system resource availability. The ICU is used to keep the BIOS and the CM informed of the cur- rent system configuration. It also aids users in determining configurations for non-PnP ISA cards. A more thorough discussion of the Con- figuration Manager and the ISA Configuration Utility can be found in the Product Development Information document of the Plug and Play Kit by Intel Corp. In a PnP BIOS system, the BIOS is responsible for configuring at least all system board PnP devices. Some systems require addi- tional software to aid the BIOS in configuring PnP ISA cards. The PnP BIOS can execute all PnP functions independently of the type of oper- ating system. However, if a PnP aware operating system is present, the PnP responsibilities are shared between the BIOS and the operating sys- tem. For more information regarding PnP BIOS, please refer to the latest revision of the Plug and Play BIOS Specification published by Compaq Computer, Phoenix Technologies, and Intel. The Plug and Play configuration sequence maps the various functional blocks of the part (logical devices) into the host system address space and configures both the DMA and interrupt channels. The host has access to the part via three 8-bit auto-configuration ports: Address port (0279h), Write Data port (0A79h), and relocatable Read Data port (020Bh - 03FFh). The read data port is relocated automatically by PnP software when a conflict occurs. The configuration sequence is as follows: 1. Host sends a software key which places all PnP cards in the sleep state (or Plug-and- Play mode). 2. The Crystal part is isolated from the system using an isolation sequence. DS213PP4 CS4237B 15 |
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