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S5935 Datasheet(PDF) 41 Page - Applied Micro Circuits Corporation |
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S5935 Datasheet(HTML) 41 Page - Applied Micro Circuits Corporation |
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41 / 204 page ![]() S5935 – PCI Product Revision 1.02 – June 27, 2006 AMCC Confidential and Proprietary DS1527 41 Data Book CLASS CODE REGISTER (CLCD) This 24-bit, read-only register is divided into three one- byte fields: the base class resides at location 0Bh, the sub-class at 0Ah, and the programming interface at 09h. The default setting for the base class is all ones (FFh), which indicates that the device does not fit into the thirteen base classes defined in the PCI Local Bus Specification. It is possible, however, through use of the external non-volatile memory, to implement one of the defined class codes described in Table 7 below. For devices that fall within the seven defined class codes, sub-classes are also assigned. Tables 8 through 20 describe each of the sub-class codes for base codes 00h through 0Ch, respectively. Figure 13. Register Name Class Code Address Offset 09h-0Bh Power-up value FF0000h Boot-load External nvRAM offset 049h-4Bh Attribute Read Only Size 24 bits Table 10. Defined Base Class Codes Base-Class Description 00h Early, pre-2.0 PCI specification devices 01h Mass storage controller 02h Network controller 03h Display controller 04h Multimedia device 05h Memory controller 06h Bridge device 07h Simple communication controller 08h Base system peripherals 09h Input devices 0Ah Docking stations 0Bh Processors 0Ch Serial bus controllers 0D-FEh Reserved FFh Device does not fit defined class codes (default) 7 0 Sub-Class 7 0 7 0 Base Class Prog I/F (Bit) (Offset) @09h @0Ah @0Bh |
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