AMD AMD-K6-2/450 Design Guide - Page 44
Memory-Range Restrictions, Table 16., Valid Masks and Range Sizes for UWCCR Register
View all AMD AMD-K6-2/450 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 44 highlights
Preliminary Information Embedded AMD-K6™ Processors BIOS Design Guide 23913A/0-November 2000 Memory-Range Restrictions The following rules regarding the address alignment and size of each range must be adhered to when programming the physical base address and physical address mask fields of the UWCCR register: s The minimum size of each range is 128 Kbytes. s The physical base address must be aligned on a 128-Kbyte boundary. s The physical base address must be range-size aligned. For example, if the size of the range is 1 Mbyte, then the physical base address must be aligned on a 1-Mbyte boundary. s All bits set to 1 in the physical address mask must be contiguous. Likewise, all bits set to 0 in the physical address mask must be contiguous. For example: 111_1111_1100_0000b is a valid physical address mask. 111_1111_1101_0000b is invalid. Table 16 lists the valid physical address masks and the resulting range sizes that can be programmed in the UWCCR register. Table 16. Valid Masks and Range Sizes for UWCCR Register Masks 111_1111_1111_1111b 111_1111_1111_1110b 111_1111_1111_1100b 111_1111_1111_1000b 111_1111_1111_0000b 111_1111_1110_0000b 111_1111_1100_0000b 111_1111_1000_0000b 111_1111_0000_0000b 111_1110_0000_0000b 111_1100_0000_0000b 111_1000_0000_0000b 111_0000_0000_0000b 110_0000_0000_0000b 100_0000_0000_0000b 000_0000_0000_0000b Size 128 Kbytes 256 Kbytes 512 Kbytes 1 Mbyte 2 Mbytes 4 Mbytes 8 Mbytes 16 Mbytes 32 Mbytes 64 Mbytes 128 Mbytes 256 Mbytes 512 Mbytes 1 Gbyte 2 Gbytes 4 Gbytes 32 Model 8/[F:8] Registers