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參數(shù)資料
| 型號： | X76F641XEG |
| 廠商： | IC MICROSYSTEMS SDN BHD |
| 元件分類： | DRAM |
| 英文描述： | 4 Mbit Uniform Sector, Serial Flash Memory |
| 中文描述： | 8K X 8 FLASH 5V PROM CARD, XMA8 |
| 封裝： | ROHS COMPLIANT, SMART CARD MODULE-8 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大小： | 167K |
| 代理商： | X76F641XEG |
X76F641
8
Figure 7. Sequential Read
Data X
S
COMMAND
Read
Password
7
Read
Password
0
S
SDA
Data 0
If ACK, then
Password Matches
S
Wait t
WC
OR
Repeated
ACK POLLING
COMMAND
S
ACK Polling
Command
7025 FM 12
PASSWORDS
The sequence in Figure 8 shows how to change (pro-
gram) the passwords. The programming of passwords is
done twice prior to the nonvolatile write cycle in order to
verify that the new password is consistent. After the eight
bytes are entered in the second pass, a comparison
takes place. A mismatch will cause the part to reset and
enter into the standby mode.
Data ACK polling can be used to determine if a password
has been loaded correctly, however the data ACK com-
mand must be issued less than 2ms after the stop bit.
After this time, it cannot be determined if the password
has been loaded correctly, without trying the new pass-
word. To determine if the new password has been loaded
correctly the data ACK polling command is issued imme-
diately following the stop bit. If it returns an ACK, then the
two passes of the new password entry do not match. If it
returns a "no ACK" then the passwords match and a high
voltage cycle is in progress. The high voltage cycle is
complete when a subsequent data ACK command
returns an "ACK".
There is no way to read any of the passwords.
Figure 8. Change Passwords
COMMAND
Old
Password
7
Old
Password
0
S
SDA
New
Password
7
Password
0
New
Password
7
New
Password
0
S
If ACK, then
Password Matches
Two bytes of “0”
Wait t
WC
OR
Repeated
ACK POLLING
COMMAND
S
ACK Polling
Command
If immediate ACK,
then New Password error
Data ACK
Polling
S
If immediate NACK,
followed by ACK after ~5ms
then New Password OK
7025 FM 13
A
S
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
N
S
S
A
A
A
A
A
A
A
A
A
A
A
A
S
A
N
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| X76F641XEG-2.0 | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure Serial Flash |
| X76F641XG | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure Serial Flash |
| X76F641XG-2.0 | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure Serial Flash |
| X7800 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Core2 Duo Processors and Core2 Extreme Processors for Platforms Based on Mobile 965 Express Chipset Family |
| X7805 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:X78XX系列是三端正電源穩(wěn)壓電路，它的封裝形式為TO-220.它有一系列固定的電壓輸出，應用非常廣泛。每種類型由于內(nèi)部電流的限制，以及過熱保護和安全工作區(qū)的保護，使它基本上不會損壞。如果能夠提供足夠的散熱片，它們就能夠提供大于1.5A輸出電流。雖然是招安照固定電壓值來設計的，但是當接入適當?shù)耐獠科骷螅湍塬@得各種不同的電壓和電流。 |
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