参数资料
型号: RCPXA272FC0312
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 312 MHz, MICROPROCESSOR, PBGA336
封装: 14 X 14 MM, 1.55 MM HEIGHT, 0.65 MM PITCH, LEAD FREE, CSP-336
文件页数: 114/138页
文件大小: 1048K
代理商: RCPXA272FC0312
Part 2: Flash Device Operations
Flash Programming Operations
Intel PXA27x Processor Family Memory Subsystem
77
After the last data is written to the buffer, the Buffered Programming Confirm command must be
issued to the original block address. The WSM begins to program buffer contents to the flash
memory array. If a command other than the Buffered Programming Confirm command is written to
the flash, a command sequence error occurs and SR[7,5,4] are set. If an error occurs while writing
to the array, the flash stops programming, and SR[7,4] are set, indicating a programming failure.
Reading from another partition is allowed while data is being programmed into the array from the
When Buffered Programming has completed, additional buffer writes can be initiated by issuing
another Buffered Programming Setup command and repeating the buffered program sequence.
Buffered programming may be performed with F-VPP = VPPL or F-VPP = VPPH. See Section 5.2,
“Operating Conditions” on page 36 for limitations when operating the flash with F-VPP = VPPH.
If an attempt is made to program past an erase-block boundary using the Buffered Program
command, the flash aborts the operation. This generates a command sequence error, and SR[5,4]
are set.
If Buffered programming is attempted while F-VPP ≤ VPPLK, SR[4,3] are set. If any errors are
detected that have set Status Register bits, the Status Register should be cleared using the Clear
Status Register command.
11.3
Flash Buffered Enhanced Factory Programming
Buffered Enhanced Factory Programing (Buffered EFP) is design to speed up flash programming
for today's beat-rate-sensitive manufacturing environments. The enhanced programming algorithm
used in Buffered EFP eliminates traditional programming elements that drive up overhead in flash
programmer systems.
Buffered EFP consists of three phases: Setup, Program/Verify, and Exit. See Figure 55, “Flash
Buffered EFP Flowchart” on page 116. It uses a write buffer to spread MLC program performance
across 32-words. Verification occurs in the same phase as programming to accurately program the
flash memory cell to the correct bit state.
A single two-cycle command sequence programs the entire block of data. This enhancement
eliminates three write cycles per buffer: two commands and the word count for each set of
32-words. Host programmer bus cycles fill the flash write buffer followed by a status check. SR.0
indicates when data from the buffer has been programmed into sequential flash memory array
locations.
Following the buffer-to-flash array programming sequence, the Write State Machine (WSM)
increments internal addressing to automatically select the next 32-word array boundary. This
aspect of Buffered EFP saves host programming equipment the address-bus setup overhead.
With adequate continuity testing, programming equipment can rely on the WSM’s internal
verification to ensure that the flash has programmed properly. This eliminates the external post-
program verification and its associated overhead.
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RCPXA271FC0312 312 MHz, MICROPROCESSOR, PBGA336
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