29F200-120 データシートの表示（PDF） - Alliance Semiconductor
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29F200-120 Datasheet PDF : 20 Pages
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Sector erase timer
(DQ3)
Toggle bit 2 (DQ2)
Checks whether sector erase timer window is open. If DQ3 = 1, erase is in progress; no commands
will be accepted. If DQ3 = 0, the device will accept sector erase commands. Check DQ3 before and
after each sector erase command to verify that the command was accepted.
During sector erase, DQ2 toggles with OE or CE only during an attempt to read a sector being
erased. During chip erase, DQ2 toggles with OE or CE for all addresses. If DQ5 = 1, DQ2 toggles
only at sector addresses where failure occurred, and will not toggle at other sector addresses. Use
DQ2 in conjunction with DQ6 to determine whether device is in auto erase or erase suspend
mode.
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Command sequence
2nd bus
Required 1st bus write cycle write cycle
bus cycles Address Data Address Data
3rd bus
write cycle
Address Data
4th bus
read/write cycle
Address Data
5th bus
write cycle
6th bus
write cycle
Address Data Address Data
Reset/Read
Read
1
XXXXh F0h Address Read Data
×16
Reset/Read
×8
4
5555h
2AAAh
5555h
AAh
55h
F0h
Read
Read
AAAAh
5555h
AAAAh
Address
Data
2251h (T)
×16
5555h
2AAAh
5555h
01h
2257h (B)
51h (T)
×8
Autoselect
AAAAh
5555h
AAAAh
02h
57h (B)
4
AAh
55h
90h
ID Read
00h
×16/×8
MFR code
52h
×16
XXX02h 01 = protected
×8
XXX04h 00 = unprotected
×16
Program
×8
4
5555h
AAh
2AAAh
55h
5555h
A0h
Program Program
AAAAh
5555h
AAAAh
Address
Data
×16
Chip Erase
×8
5555h
2AAAh
5555h
5555h
2AAAh
5555h
6
AAh
55h
80h
AAh
55h
10h
AAAAh
5555h
AAAAh
AAAAh
5555h
AAAAh
×16
Sector Erase
×8
5555h
2AAAh
5555h
5555h
2AAAh
Sector
6
AAh
55h
80h
AAh
55h
30h
AAAAh
5555h
AAAAh
AAAAh
5555h
Address
Sector Erase Suspend
1
XXXXh B0h
Sector Erase Resume
1
XXXXh 30h
1 Bus operations defined in "Mode definitions," on page 4.
2 Reading data from or programming data to non-erasing sectors allowed in Erase Suspend mode.
3 Address bit A15 = X = Don’t care for all address commands except Program Address and Sector Address.
4 Address bit A16 = X = Don’t care for all address commands except Program Address and Sector Address.
5 System should generate address patterns: ×16 mode - 5555h or 2AAAh to address A0–A14; ×8 mode - AAAAh or 5555h to address A-1–A14.
6 A0 = 0, A1 = 1, A6 = 0 for sector protect verify; sector selected on A16-A12.
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