AMD Confidential
User Manual
November 21
st
, 2008
82
Chapter 7: Device Configuration
Selecting the
System BIOS ROM
option tells the memory device it is the system BIOS.
The memory device only responds to memory address ranges accompanied by a chip-
select that is generated by the Southbridge device.
Selecting
Flash Mode
option tells the memory device that it is configured as a flash
memory device. There are two command sequences supported by our flash memory
device - SST and ATMEL, which can be selected by the drop down below.
Selecting the
Memory Address Masking
option indicates that the address received by the
memory device is masked by a bit mask with the same number of bits as the size of the
memory device (e.g., a 256-Kbyte ROM uses an 18-bit mask, or it is masked by
0x003FFFF). This enables the ROM to be remapped dynamically into different memory
address ranges in conjunction with the aforementioned chip-select.
Selecting the
Initialized unwritten memory to (hex):
option initializes otherwise not
initialized memory, with a separate field for specifying the byte to use for initialization.
Selecting the
Memory is non-cacheable
option tells the system if the memory described
by the device is non-cacheable.
Figure 7-14: Memory Configuration Properties Dialog