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CS4237B Datasheet(PDF) 13 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 13 Page - Cirrus Logic |
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13 / 114 page  Logical Device 5 supports a modem connected to the peripheral port. This interface, on the ex- ternal peripheral port, supports modems with 2 to 256 I/O locations (only SA2-SA0 are buffered through the part) and supports a base address and an interrupt. Although this logical device is listed as a modem, any external device that fits within the resources listed above may be substi- tuted. ISA Bus Interface The 8-bit parallel I/O and 8-bit parallel DMA ports provide an interface which is compatible with the Industry Standard Architecture (ISA) bus. The ISA Interface enables the host to com- municate with the various functional blocks within the part via two types of accesses: Pro- grammed I/O (PIO) access, and DMA access. A number of configuration registers must be pro- grammed prior to any accesses by the host computer. The configuration registers are pro- grammed via a Plug-and-Play configuration sequence or via configuration software provided by Crystal Semiconductor. I/O CYCLES Every device that is enabled, requires I/O space. An I/O cycle begins when the part decodes a valid address on the bus while the DMA ac- knowledge signals are inactive and AEN is low. The IOR and IOW signals determine the direc- tion of the data transfer. For read cycles, the part will drive data on the SD<7:0> lines while the host asserts the IOR strobe. Write cycles require the host to assert data on the SD<7:0> lines and strobe the IOW signal. Data is latched on the ris- ing edge of the IOW strobe. PnP ISA Bus Interface WSS Codec: I/O: WSSbase 2 DMA Chan. 1 Interrupt SBPro: I/O: SBbase (DMA shared) (Interrupt shared) Synthesis: I/O: SYNbase [1 Interrupt] Game Port: I/O: GAMEbase Control: I/O: CTRLbase [1 Interrupt] MPU-401: I/O: MPUbase 1 Interrupt CDROM: I/O: CDbase ACDbase [1 Interrupt] [1 DMA Chan.] Logical Device 0 Logical Device 1 Logical Device 3 Modem: I/O: COMbase [1 Interrupt] Logical Device 4 Logical Device 5 Logical Device 2 Figure 1. Logical Devices DS213PP4 CS4237B 13 |
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