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: 26/138页
文件大小: 1048K
代理商: RCPXA272FC0312
B. Common Flash Interface
Intel PXA27x Processor Family Memory Subsystem
121
Common Flash Interface
B
The Common Flash Interface (CFI) is part of an overall specification for multiple command-set
and control-interface descriptions. This appendix describes the database structure containing the
data returned by a read operation after issuing the CFI Query command (see Section 9.2, “Flash
Bus Operations” on page 64). System software can parse this database structure to obtain
information about the flash, such as block size, density, bus width, and electrical specifications.
The system software will then know which command set(s) to use to properly perform flash writes,
block erases, reads and otherwise control the flash.
B.1
Query Structure Output
The Query database allows system software to obtain information for controlling the flash. This
section describes the flash CFI-compliant interface that allows access to Query data.
Query data are presented on the lowest-order data outputs (DQ[7:0]) only. The numerical offset
value is the address relative to the maximum bus width supported by the flash. For the PXA27x
processor memory subsystem, the flash Query table starting address is a 10h, which is a word
address for x16 flash.
For a word-wide (x16) flash, the first two Query-structure bytes, ASCII “Q” and “R,” appear on the
low byte at word addresses 10h and 11h. This CFI-compliant flash outputs 00h data on upper bytes.
The flash outputs ASCII “Q” in the low byte (DQ[7:0]) and 0x00 in the high byte (DQ[15:8]).
At Query addresses containing two or more bytes of information, the least significant data byte is
presented at the lower address, and the most significant data byte is presented at the higher address.
In all of the following tables, addresses and data are represented in hexadecimal notation, so the
“h” suffix has been dropped. In addition, since the upper byte of word-wide flash is always “0x00,”
the leading “00” has been dropped from the table notation and only the lower byte value is shown.
Any x16 flash outputs can be assumed to have 0x00 on the upper byte in this mode.
Table 36.
Summary of Query Structure Output as a Function of Device and Mode
Device
Hex
Offset
Hex
Code
ASCII
Value
Device Addresses
00010
51
“Q”
00011
52
“R”
00012
59
“Y”
相关PDF资料
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RCPXA271FC0312 312 MHz, MICROPROCESSOR, PBGA336
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