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CS4237B Datasheet(PDF) 16 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 16 Page - Cirrus Logic |
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16 / 114 page  3. A unique identifier (handle) is assigned to the part and the resource data is read. 4. After all cards’ resource requirements are de- termined, the host uses the handle to assign conflict-free resources 5. After the configuration registers have been programmed, each configured logical device is activated. 6. The part is then removed from Plug-and-Play mode. Upon power-up, the chip is inactive and must be enabled via software. The Crystal part monitors writes to the PnP Auto-Configuration Address port (0279h). If the host sends a PnP initiation key, consisting of a series of 32 predefined byte writes, the hardware will detect the key and place the part into the Plug-and-Play (PnP) mode. Another method to program the part is to use a special Crystal initiation key which func- tions like the PnP initiation key, but can be invoked by the user at any time. However, the Crystal Key only supports one Crystal part per system. The Crystal key and special commands are detailed in the Crystal Key and Bypassing PnP sections. The isolation sequence uses a unique 72-bit se- rial identifier. The host performs 72 pairs of I/O read accesses to the Read Data port. The identi- fier determines what data is put on the data bus in response to those read accesses. When the iso- lation sequence is complete, the CM assigns a Card Select Number (CSN) to the part. This number distinguishes the Crystal part from the other PnP devices in the system. The Configura- tion Manager (CM) then reads the resource data from the Crystal part. The 72-bit identifier and the resource data is either stored in an external user-programmable E 2PROM, or loaded via a "hostload" procedure from BIOS before PnP software is initiated. The CM determines the necessary resource re- quirements for the system and then programs the part through the configuration registers. The con- figuration register data is written one logical device at a time. After all logical devices have been configured, CM activates each device indi- vidually. Each logical device is now available on the ISA bus and responds to the programmed address range, DMA channels, and interrupts that have been allocated to that logical device. PnP Data Hardware Configuration and Plug-and-Play re- source data must be loaded into the part’s RAM. The data may be stored in an external E 2PROM or may be downloaded from the host. To load the data, refer to the Loading Resource Data section. The following is the Plug-and-Play resource data: The first nine bytes of the PnP resource data are the Plug-and-Play ID, which uniquely identifies the Crystal part from other PnP devices. The Crystal default is broken down as follows: 0Eh, 63h - Crystal ID - ’CSC’ in compressed ASCII. (See the PnP Spec for more information) 42h - Oem ID. A unique Oem ID must be ob- tained from Crystal for each unique Crystal product used. 37h - Crystal product ID for the CS4237B FFh, FFh, FFh, FFh - Serial number. This can be modified by each OEM to uniquely identify their card. ??h - Checksum. Of the 9-byte serial number listed above, Crystal software uses the first two bytes to indicate the presence of a Crystal part, and the fourth byte, 0x37, to indicate the CS4237B; therefore, these three bytes must not be altered. DS213PP4 CS4237B 16 |
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Similar Description - CS4237B |
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