參數(shù)資料
型號(hào)： WEDPNF8M722V-1015BI
廠商： WHITE ELECTRONIC DESIGNS CORP
元件分類： 存儲(chǔ)器
英文描述： SPECIALTY MEMORY CIRCUIT, PBGA275
封裝： 32 X 25 MM, PLASTIC, BGA-275
文件頁(yè)數(shù)： 14/43頁(yè)
文件大?。?/td> 1280K
代理商： WEDPNF8M722V-1015BI
21
2 1
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
WEDPNF8M722V-XBX
UNLOCK BYPASS COMMAND SEQUENCE
The unlock bypass feature allows the system to program
bytes or words to the device faster than using the standard
program command sequence. The unlock bypass com-
mand sequence is initiated by first writing two unlock cycles.
This is followed by a third write cycle containing the unlock
bypass command, 20h. The device then enters the unlock
bypass mode. A two-cycle unlock bypass program com-
mand sequence is all that is required to program in this
mode. The first cycle in this sequence contains the unlock
bypass program command, A0h; the second cycle con-
tains the program address and data. Additional data is pro-
grammed in the same manner. This mode dispenses with
the initial two unlock cycles required in the standard pro-
gram command sequence, resulting in fast total program-
ming time. Table 7 shows the requirements for the com-
mand sequence.
During the unlock bypass mode, only the Unlock Bypass
Program and Unlock Bypass Reset commands are valid. To
exit the unlock bypass mode, the system must issue the
two-cycle unlock bypass reset command sequence. The
first cycle must contain the data 90h; the second cycle the
data 00h. Addresses are “don't care” for both cycles. The
device then returns to reading array data.
Figure 6 illustrates the algorithm for the program operation.
See the Erase/Program Operations table in the “Flash AC
Characteristics” for parameters, and to Figure 12 for timing
diagrams.
AUTOSELECT COMMAND SEQUENCE
The autoselect command sequence allows the host sys-
tem to determine whether or not a sector is protected. Table
7 shows the address and data requirements. This method
is an alternative to that shown in Table 6, which is intended
for PROM programmers and requires VID on address bit FA9.
The autoselect command sequence is initiated by writing
two unlock cycles, followed by the autoselect command.
The device then enters the autoselect mode, and the sys-
tem may read at any address any number of times, without
initiating another command sequence.
A read cycle containing a sector address (SA) and the ad-
dress 02h in word mode (or 04h in byte mode) returns
02h in that sector is protected, or 00h if it is unprotected.
Refer to Table 5 for valid sector addresses.
The system must write the reset command to exit autoselect
mode and return to reading array data.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
WEDPNF8M722V-1015BM 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package
WEDPNF8M722V-1210BC 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package
WEDPNF8M722V-1210BI 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package
WEDPNF8M722V-1210BM 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package
WEDPNF8M722V-1212BC 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx72 Synchronous DRAM + 16Mb Flash Mixed Module Multi-Chip Package
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