km29w32000ait Samsung Semiconductor, Inc., km29w32000ait Datasheet - Page 25

• Manufacturer Part Number: km29w32000ait
• Description: 8-bit Nand Flash Memory
• Manufacturer: Samsung Semiconductor, Inc.

Figure 9. Read ID Operation
READ ID
The device contains a Status Register which may be read to find out whether program or erase operation is complete, and whether
the program or erase operation completed successfully. After writing 70H command to the command register, a read cycle outputs
the contents of the Status Register to the I/O pins on the falling edge of CE or RE, whichever occurs last. This two line control allows
the system to poll the progress of each device in multiple memory connections even when R/B pins are common-wired. RE or CE
does not need to be toggled for updated status. Refer to table 2 for specific Status Register definitions. The command register
remains in Status Read mode until further commands are issued to it. Therefore, if the status register is read during a random read
cycle, a read command(00H or 50H) should be given before sequential page read cycle.
The device contains a product identification mode, initiated by writing 90H to the command register, followed by an address input of
00H. Two read cycles sequentially output the manufacture code(ECH), and the device code (E3H) respectively. The command regis-
ter remains in Read ID mode until further commands are issued to it. Figure 9 shows the operation sequence.
KM29W32000AT, KM29W32000AIT
READ STATUS
CLE
CE
WE
ALE
RE
I/O
Table2. Status Register Definition
0
~
7
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
SR
0
1
2
3
4
5
6
7
90H
Address. 1 cycle
00
Reserved for Future
Device Operation
Program / Erase
Erase Suspend
Write Protect
Status
Use
t
AR1
t
CR
25
t
READID
Maker code
"0" : Successful Program / Erase
"1" : Error in Program / Erase
"0"
"0"
"0"
"0"
"0" : Erase in Progress / Completed
"1" : Suspended
"0" : Busy
"0" : Protected
ECH
FLASH MEMORY
Definition
Device code
E3H
"1" : Not Protected
"1" : Ready