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CS4237B Datasheet(PDF) 17 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 17 Page - Cirrus Logic |
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17 / 114 page  The next 3 bytes are the PnP version number. The default is version 1.0a: 0Ah, 10h, 01h. The next sequence of bytes are the ANSI identi- fier string. The default is: 82h, 0Eh, 00h, ’Crystal Codec’, 00h. The logical device data must be entered using the PnP ISA Specification format. Typical logical device values are found in Table 1. Th e E 2PROM version for this data is found in Ap- pendix A. Loading Resource Data A serial E 2PROM interface allows user-program- mable serial number and resource data to be stored in an external E 2PROM. The interface is compatible with devices from a number of ven- dors and the size may vary according to specific customer requirements. The maximum size for resource data supported by the part’s internal RAM is 384 bytes of combined Hardware Con- figuration and PnP resource data. With the addition of the 4-byte header, the maximum amount of E 2PROM space used would be 388 bytes. However, the part also supports firmware upgrades via the E 2PROM. The maximum size E 2PROM supported is 2k bytes. After power-up, the existence of an E 2PROM is checked by read- ing the first two bytes from the E 2PROM interface. If the data from the E 2PROM port reads 55h and BBh, then the rest of the E 2PROM data is loaded into the internal RAM. If the first two bytes aren’t correct, the E 2PROM is assumed not to exist and a "hostload" proce- dure must be used to load the internal RAM. The Hostload procedure can be found in the Hostload section. For motherboard designs, an E 2PROM should still be included, to allow faster integrat- ing of resource and firmware patch data. This allows updates without respiring BIOS code. If the part is installed on a plug-in card, then an external E 2PROM is required to ensure that the proper PnP resource data is loaded into the inter- nal RAM prior to a PnP sequence. See the External E 2PROM section for more information on the serial E 2PROM interface and E2PROM programming. The format for the data stored in the E 2PROM is as follows: (Hardware Configuration Data:) 2 bytes E 2PROM validation: 55h, BBh 2 bytes length of resource data in E 2PROM 19 bytes Hardware Configuration (Plug and Play Resource Data:) 9 bytes Plug and Play ID 3 bytes Plug and Play version number Variable number of bytes of user defined ASCII ID string Logical Device 0 (Windows Sound System, FM Synthesizer, Sound Blaster Pro) data Logical Device 1 ( Game Port) data Logical Device 2 ( Control) data Logical Device 3 ( MPU-401) data Logical Device 4 ( CD-ROM) data Logical Device 5 (Modem) data End of Resource byte & checksum byte Firmware patch code. A typical E 2PROM data load, in assembly for- mat, can be found in Appendix A. Loading Firmware Patch Data An external E 2PROM is read during the power- up sequence that stores Hardware Configuration and PnP data, and firmware patch data. The part contains RAM and ROM to run the core proces- DS213PP4 CS4237B 17 |
Similar Part No. - CS4237B |
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Similar Description - CS4237B |
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