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参数资料
| 型号： | MBM29DL32TF70TN |
| 厂商： | FUJITSU LTD |
| 元件分类： | PROM |
| 英文描述： | 2M X 16 FLASH 3V PROM, 70 ns, PDSO48 |
| 封装： | PLASTIC, TSOP1-48 |
| 文件页数： | 28/70页 |
| 文件大小： | 862K |
| 代理商： | MBM29DL32TF70TN |
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MBM29DL32TF/BF-70
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data of memory cell be read from the another bank. Following the command write, a read cycle from specific
address retrieves device information. Please note that output data of upper byte (DQ15 to DQ8) is “0” in word
mode (16 bit) read. Refer to the Common Flash memory Interface code table. To terminate operation, it is
necessary to write the read/reset command sequence into the register. (See “Common Flash Memory Interface
Code Table” in sFLEXIBLE SECTOR-ERASE ARCHITECTURE.)
9.
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 protected, 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 256 bytes in length and is stored at the same address of SA0 in Bank A. The
MBM29DL32TF occupies the address of the byte mode 3FFF00h to 3FFFFFh (word mode 1FFF80h to 1FFFFFh)
and the MBM29DL32BF type occupies the address of the byte mode 000000h to 0000FFh (word mode 000000h
to 00007Fh) . After the system has written the Enter HiddenROM command sequence, the system may read
the HiddenROM region by using the addresses normally occupied by the boot sectors. That is, the device sends
all commands that would normally be sent to the boot sectors 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 boot sectors.
When reading the HiddenROM region, either change addresses or change CE pin from “H” to “L”. The same
procedure should be taken (changing addresses or CE pin from “H” to “L”) after the system issues the Exit
HiddenROM command sequence to read actual memory cell data.
10. HiddenROM Entry Command
The device has a HiddenROM area with one time protect function. This area is to enter the security code and
to unable the change of the code once set. Programming is allowed in this area until it is protected. However,
once it gets protected, it is impossible to unprotect. Therefore, extreme caution is required.
The HiddenROM area is 256 bytes. This area is normally the “outermost” 8 Kbyte boot block area in Bank 1.
Therefore, write the HiddenROM entry command sequence to enter the HiddenROM area. It is called Hidden-
ROM mode when the HiddenROM area appears.
Sectors other than the boot block area SA0 can be read during HiddenROM mode. Read/program of the Hid-
denROM area is possible during HiddenROM mode. Write the HiddenROM reset command sequence to exit
the HiddenROM mode. The bank address of the HiddenROM should be set on the third cycle of this reset
command sequence.
In HiddenROM mode, the simultaneous operation cannot be executed multi-function mode between the Hid-
denROM area and the Bank A. Note that any other commands should not be issued other than the HiddenROM
program/protection/reset commands during the HiddenROM mode. When you issue the other commands in-
cluding the suspend resume, send the HiddenROM reset command first to exit the HiddenROM mode and then
issue each command.
11. HiddenROM Program Command
To program the data to the HiddenROM area, write the HiddenROM program command sequence during Hid-
denROM mode. This command is the same as the usual program command, except that it needs to write the
command during HiddenROM mode. Therefore the detection of completion method is the same as in the past,
using the DQ7 data pooling, DQ6 toggle bit and RY/BY pin. You should pay attention to the address to be
programmed. If an address not in the HiddenROM area is selected, the previous data will be deleted. During
the write into the HiddenROM region, the program suspend command issuance is prohibited.
12. HiddenROM Protect Command
There are two methods to protect the HiddenROM area. One is to write the sector group protect setup command
(60h) , set the sector address in the HiddenROM area and (A6, A3, A2, A1, A0)
= (0, 0, 0, 1, 0) , and write the
sector group protect command (60h) during the HiddenROM mode. The same command sequence may be used
because it is the same as the extension sector group protect in the past, except that it is in the HiddenROM
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相关代理商/技术参数 |
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| MBM29DL32XBD | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:32M (4M X 8/2M X 16) BIT Dual Operation |
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