參數(shù)資料
型號: MT28F640J3BS-12MET
元件分類: PROM
英文描述: 4M X 16 FLASH 2.7V PROM, 120 ns, PBGA64
封裝: 10 X 13 MM, 1 MM PITCH, LEAD FREE, FBGA-64
文件頁數(shù): 5/54頁
文件大?。?/td> 587K
代理商: MT28F640J3BS-12MET
128Mb, 64Mb, 32Mb
Q-FLASH MEMORY
09005aef80b5a323
Micron Technology, Inc., reserves the right to change products or specifications without notice.
MT28F640J3_J.fm – Rev. J 2/26/04 EN
13
2004 Micron Technology. Inc.
wake-up interval, normal operation is restored. The
command execution logic (CEL) is reset to the read
array mode and the status register is set to 80h.
During block erase, program, or lock bit configura-
tion, RP# LOW aborts the operation. In default mode,
STS transitions LOW and remains LOW for a maxi-
mum time of tPLPH + tPHRH, until the RESET opera-
tion is complete. Any memory content changes are no
longer valid; the data may be partially corrupted after a
program or partially changed after an erase or lock bit
configuration. After RP# goes to logic HIGH (VIH), and
after tRS, another command can be written.
It is important to assert RP# during system reset.
After coming out of reset, the system expects to read
from the Flash memory. During block erase, program,
or lock bit configuration mode, automated Flash
memories provide status information when accessed.
When a CPU reset occurs with no Flash memory reset,
proper initialization may not occur because the Flash
memory may be providing status information instead
of array data. Micron Flash memories allow proper ini-
tialization following a system reset through the use of
the RP# input. RP# should be controlled by the same
RESET# signal that resets the system CPU.
Read Query
The READ QUERY operation produces block status
information, CFI ID string, system interface informa-
tion, device geometry information, and extended
query information. READ QUERY information is only
accessed by executing a single-word READ.
Read Identifier Codes
The READ IDENTIFIER CODES operation produces
the manufacturer code, device code, and the block
lock configuration codes for each block (see Figure 9).
The block lock configuration codes identify locked and
unlocked blocks.
Write
Writing commands to the CEL allows reading of
device data, query, identifier codes, and reading and
clearing of the status register. In addition, when VPEN =
VPENH, block erasure, program, and lock bit configura-
tion can also be performed.
The BLOCK ERASE command requires suitable
command data and an address within the block. The
BYTE/WORD PROGRAM command requires the com-
mand and address of the location to be written to. The
CLEAR BLOCK LOCK BITS command requires the
command and any address within the device. Set
BLOCK LOCK BITS command requires the command
and the block to be locked. The CEL does not occupy
an addressable memory location. It is written to when
the device is enabled and WE# is LOW. The address
and data needed to execute a command are latched on
the rising edge of WE# or the first edge of CEx that dis-
ables the device (see Table 2 on page 12). Standard
microprocessor write timings are used.
Figure 9: Device Identifier Code
Memory Map
NOTE:
When obtaining these identifier codes, A0 is not used in
either x8 or x16 modes. Data is always given on the
LOW byte in x16 mode (upper byte contains 00h).
Reserved for Future
Implementation
Manufacturer Code
Device Code
010000h
00FFFFh
000004h
000003h
000002h
000001h
000000h
Reserved for Future
Implementation
Reserved for Future
Implementation
Reserved for Future
Implementation
Block 63
Block 0
3FFFFFh
3F0003h
3F0002h
3F0000h
3EFFFFh
1EFFFFh
1F0003h
1F0002h
1F0000h
01FFFFh
010003h
010002h
32
Mb
64Mb
128Mb
Block 63 Lock Configuration
Block 0 Lock Configuration
Reserved for Future
Implementation
(Blocks 32 through 62)
Reserved for Future
Implementation
7FFFFFh
7F0003h
7F0002h
7F0000h
7EFFFFh
Block 127 Lock Configuration
Reserved for Future
Implementation
Block 31
Reserved for Future
Implementation
(Blocks 2 through 30)
Block 1
Reserved for Future
Implementation
Block 1 Lock Configuration
Block 127
Block 31 Lock Configuration
(Blocks 64 through 126)
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