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CS4237B Datasheet(PDF) 19 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 19 Page - Cirrus Logic |
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19 / 114 page  The Crystal key places the part in the configura- tion mode. Once the Crystal key has been initiated, new PnP resource data can be down- loaded by a hostload sequence, or an alternate method of programming the configuration regis- ters may be used. This alternate method is referred to as the "SLAM" method. The SLAM method allows the user to directly access the configuration registers, configure, and activate the chip, and then, optionally, disable the PnP and/or Crystal key feature. The SLAM method uses commands that are similar to the PnP com- mands; however, they are different since the user has direct access to the configuration registers. To use the SLAM method, see the Bypassing PnP section. The following 32 bytes, in hex, are the Crystal key: 96, 35, 9A, CD, E6, F3, 79, BC, 5E, AF, 57, 2B, 15, 8A, C5, E2 F1, F8, 7C, 3E, 9F, 4F, 27, 13, 09, 84, 42, A1, D0, 68, 34, 1A Bypassing Plug and Play The SLAM method allows the user to bypass the Plug and Play features and, as an option, allows the part to act like a non-Plug and Play or legacy device; however, the SLAM method only sup- ports one Crystal IC per system. The user directly programs the resources into the part, and then optionally disables the PnP and/or the Crys- tal Key, which forces the part to disregard any future PnP or Crystal initiation key sequences (All activated logical devices appear as legacy devices to PnP). The Crystal and PnP keys can also be disabled through the E 2PROM. To use the SLAM method, the following se- quence must be followed: 1. Host sends 32-byte Crystal key to I/O 0279h, chip enters configuration mode. 2. Host programs CSN (Card Select Number) by writing a 06h and 00h to I/O 0279h. 3. Host programs the configuration registers of each logical device by writing to I/O 0279h. The following data is the maximum amount of information per device. All current devices only need a subset of this data: Logical Device ID (15h, xxh) xxh is logical device number: 0-5 I/O Port Base Address 0 (47h, xxh, xxh) high byte , low byte I/O Port Base Address 1 (48h, xxh, xxh) high byte , low byte I/O Port Base Address 2 (42h, xxh, xxh) high byte , low byte Interrupt Select 0 (22h, xxh) Interrupt Select 1 (27h, xxh) DMA Select 0 (2Ah, xxh) DMA Select 1 (25h, xxh) Activate Device (33h, 01h) (33h, 00h deactivates a device) 4. Repeat #3 for each logical device to be en- abled. (Not all devices need be enabled.) 5. Host activates chip by writing a 79h to 279h. 6. (Optional) Host disables PnP Key by writing a 55h to CTRLbase+5. The part will not par- ticipate in any future PnP cycles. The Crystal Key can also be disabled by writing a 56h to CTRLbase+5. DS213PP4 CS4237B 19 |
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Similar Description - CS4237B |
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