參數(shù)資料
型號(hào)： MBM29LV651UE-90TN
廠商： SPANSION LLC
元件分類： PROM
英文描述： 4M X 16 FLASH 3V PROM, 90 ns, PDSO48
封裝： PLASTIC, TSOP1-48
文件頁(yè)數(shù)： 18/57頁(yè)
文件大?。?/td> 640K
代理商： MBM29LV651UE-90TN
MBM29LV650UE90/651UE90
24
HiddenROM Region
The HiddenROM feature provides a Flash memory region that the system may access through a new command
sequence. This is primarily intended for customers who wish to use an Electronic Serial Number (ESN) in the
device with the ESN protected against modification. Once the HiddenROM region is programmed, any further
modification of that region is impossible. This ensures the security of the ESN once the product is shipped to
the field.
The HiddenROM region is 128 words in length. After the system writes the Enter HiddenROM command
sequence, it may read the HiddenROM region by using device addresses A0 to A6 (A7 to A14 are “00”, A15 to A21
are don’t care). That is, the device sends only program command that would normally be sent to the address to
the HiddenROM region. This mode of operation continues until the system issues the Exit HiddenROM command
sequence, or until power is removed from the device. On power-up, or following a hardware reset, the device
reverts to sending commands to the address.
If you request Fujitsu to program the ESN in the device, please contact a Fujitsu representative for more
information.
Write Operation Status
Detailed in “Hardware Sequence Flags” are all the status flags that can be used to check the status of the device
for current mode operation. During sector erase, the part provides the status flags automatically to the I/O ports.
The information on DQ2 is address sensitive. This means that if an address from an erasing sector is consecutively
read, then the DQ2 bit will toggle. However, DQ2 will not toggle if an address from a non-erasing sector is
consecutively read. This allows the user to determine which sectors are erasing and which are not.
Once erase suspend is entered, address sensitivity still applies. If the address of a non-erasing sector (that is,
one available for read) is provided, then stored data can be read from the device. If the address of an erasing
sector (that is, one unavailable for read) is applied, the device will output its status bits.
*: Successive reads from the erasing or erase-suspend sector causes DQ2 to toggle. Reading from non-erase
suspend sector address will indicate logic “1” at the DQ2 bit.
Hardware Sequence Flags Table
Status
DQ7
DQ6
DQ5
DQ3
DQ2
In Progress
Embedded Program Algorithm
DQ7
Toggle
0
1
Embedded Erase Algorithm
0
Toggle
0
1
Toggle*
Erase
Suspended
Mode
Erase Suspend Read
(Erase Suspended Sector)
1100
Toggle
Erase Suspend Read
(Non-Erase Suspended Sector)
Data
Erase Suspend Program
(Non-Erase Suspended Sector)
DQ7
Toggle
0
1*
Exceeded
Time Limits
Embedded Program Algorithm
DQ7
Toggle
1
0
1
Embedded Erase Algorithm
0
Toggle
1
N/A
Erase
Suspended
Mode
Erase Suspend Program
(Non-Erase Suspended Sector)
DQ7
Toggle
1
0
N/A
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MBM29LV651UE90TR 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:64M (4M x 16) BIT
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MBM29LV652UE-90 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:64M (4M X 16) BIT
MBM29LV652UE90PBT 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:64M (4M X 16) BIT
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