參數(shù)資料
型號： KFH4G16U2M-DIB6
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： FLASH MEMORY(54MHz)
中文描述： 閃存（54MHz之間）
文件頁數(shù)： 122/125頁
文件大?。?/td> 1657K
代理商： KFH4G16U2M-DIB6
OneNAND1G(KFG1G16Q2M-DEB5)
FLASH MEMORY
122
OneNAND2G(KFH2G16Q2M-DEB5)
OneNAND4G(KFW4G16Q2M-DEB5)
One of the best features OneNAND has is that it can be a booting device itself since it contains an internally built-in boot loader
despite the fact that its core architecture is based on NAND Flash. Thus, OneNAND does not make any additional booting device
necessary for a system, which imposes extra cost or area overhead on the overall system.
As the system power is turned on, the boot code originally stored in NAND Flash Arrary is moved to BootRAM automatically and then
fetched by CPU through the same interface as SRAM’s or NOR Flash’s if the size of the boot code is less than 1KB. If its size is larger
than 1KB and less than or equal to 3KB, only 1KB of it can be moved to BootRAM automatically and fetched by CPU, and the rest of
it can be loaded into one of the DataRAMs whose size is 2KB by Load Command and CPU can take it from the DataRAM after finish-
ing the code-fetching job for BootRAM. If its size is larger than 3KB, the 1KB portion of it can be moved to BootRAM automatically
and fetched by CPU, and its remaining part can be moved to DRAM through two DataRAMs using dual buffering and taken by CPU
to reduce CPU fetch time.
A typical boot scheme usually used to boot the system with OneNAND is explained at Patition of NAND Flash Array and OneNAND
Boot Sequence. In this boot scheme, boot code is comprised of BL1, where BL stands for Boot Loader, BL2, and BL3. Moreover, the
size of the boot code is larger than 3KB (the 3rd case above). BL1 is called primary boot loader in other words. Here is the table of
detailed explanations about the function of each boot loader in this specific boot scheme.
Boot Loaders in OneNAND
NAND Flash Array of OneNAND is divided into the partitions as described at Partition of NAND Flash Array to show where each
component of code is located and how much portion of the overall NAND Flash Array each one occupies. In addition, the boot
sequence is listed below and depicted at Boot Sequence.
Boot Loader
Description
BL1
Moves BL2 from NAND Flash Array to DRAM through two DataRAMs using dual buffering
BL2
Moves OS image (or BL3 optionally) from NAND Flash Array to DRAM through two DataRams using dual buffering
BL3 (Optional)
Moves or writes the image through USB interface
7.2.1 Boot Loaders in OneNAND
Boot Sequence :
1. Power is on
BL1 is loaded into BootRAM
2. BL1 is executed in BootRAM
BL2 is loaded into DRAM through two DataRams using dual buffering by BL1
3. BL2 is executed in DRAM
OS image is loaded into DRAM through two DataRams using dual buffering by BL2
4. OS is running
7.2.2 Boot Sequence
7.2 Boot Sequence
相關(guān)PDF資料
PDF描述
KFH4G16U2M-DID5 FLASH MEMORY(54MHz)
KFH4G16U2M-DID6 FLASH MEMORY(54MHz)
KFG2G1612M-DED5 FLASH MEMORY(54MHz)
KFH1G16U2M-DED6 FLASH MEMORY(54MHz)
KFH1G16U2M-DIB FLASH MEMORY
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
KFH4G16U2M-DID5 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FLASH MEMORY(54MHz)
KFH4G16U2M-DID6 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FLASH MEMORY(54MHz)
KFH63210 制造商:n/a 功能描述:Ships in 2 days
KFH63212 制造商:n/a 功能描述:Ships in 2 days
KFH-632-12 制造商:Penn 功能描述:
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