参数资料
型号: RCPXA273FC0416
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 416 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: 127/138页
文件大小: 1048K
代理商: RCPXA273FC0416
Part 2: Flash Device Operations
Flash Dual-Operation Considerations
Intel PXA27x Processor Family Memory Subsystem
89
Flash Dual-Operation Considerations
14
The multi-partition architecture of the flash allows background programming (or erasing) to occur
in one partition while data reads (or code execution) take place in another partition.
14.1
Flash Partitioning
The flash memory array is divided into multiple 16-Mbit partitions, which allows simultaneous
read-while-write operations. Simultaneous program and erase is not allowed. Only one partition at
a time can be in program or erase mode.
The flash supports read-while-write operations with bus cycle granularity and not command
granularity. In other words, it is not assumed that both bus cycles of a two cycle command (an erase
command for example) will always occur as back to back bus cycles to the flash. In practice, code
fetches (reads) may be interspersed between write cycles to the flash, and they will likely be
directed to a different partition than the one being written. This is especially true when a processor
is executing code from one partition that instructs the processor to program or erase in another
partition.
14.2
Flash Read-While-Write Command Sequences
When issuing commands to the flash, a read operation can occur between 2-cycle Write
command’s (Figure 29, and Figure 30). However, a write operation issued between a 2-cycle
commands write sequence causes a command sequence error. (See Figure 31, “Flash Operating
When reading from the same partition after issuing a Setup command, Status Register data is
returned, regardless of the read mode of the partition prior to issuing the Setup command.
Figure 29.
Flash Operating Mode with Correct Command Sequence Example
Partition A
Partition B
0x20
0xD0
0xFF
Address [A]
WE# [W]
OE# [G]
Data [D/Q]
相关PDF资料
PDF描述
RCPXA273FC0520 520 MHz, MICROPROCESSOR, PBGA336
RCPXA272FC0312 312 MHz, MICROPROCESSOR, PBGA336
RCPXA271FC0312 312 MHz, MICROPROCESSOR, PBGA336
RCPXA271FC0416 416 MHz, MICROPROCESSOR, PBGA336
RD151TS3312ARPH0 20 MHz, OTHER CLOCK GENERATOR, PDSO8
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