NAND01G-B2B, NAND02G-B2C
Device operations
6.6
Block erase
Erase operations are done one block at a time. An erase operation sets all of the bits in the
addressed block to ‘1’. All previous data in the block is lost.
An erase operation consists of three steps (refer to Figure 14):
1. One bus cycle is required to setup the Block Erase command. Only addresses A18-
A28 (x8) or A17-A27 (x16) are used, the other address inputs are ignored
2. Two or three bus cycles are then required to load the address of the block to be erased.
Refer to Table 8 and Table 9 for the block addresses of each device
3. One bus cycle is required to issue the Block Erase Confirm command to start the P/E/R
controller.
The operation is initiated on the rising edge of write Enable, W, after the Confirm command
is issued. The P/E/R controller handles block erase and implements the verify process.
During the block erase operation, only the Read Status Register and Reset commands will
be accepted, all other commands will be ignored.
Once the program operation has completed the P/E/R controller bit SR6 is set to ‘1’ and the
Ready/Busy signal goes High. If the operation completed successfully, the write status bit
SR0 is ‘0’, otherwise it is set to ‘1’.
Figure 14. Block erase operation
tBLBH3
(Erase Busy time)
RB
Busy
Block Address
Inputs
I/O
60h
D0h
70h
SR0
Confirm
Code
Read Status Register
Block Erase
Setup Code
ai07593
6.7
Reset
The Reset command is used to reset the command interface and status register. If the
Reset command is issued during any operation, the operation will be aborted. If it was a
program or erase operation that was aborted, the contents of the memory locations being
modified will no longer be valid as the data will be partially programmed or erased.
If the device has already been reset then the new Reset command will not be accepted.
The Ready/Busy signal goes Low for t
after the Reset command is issued. The value
BLBH4
of t
depends on the operation that the device was performing when the command was
BLBH4
issued, refer to Table 25: AC characteristics for operations for the values.
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NUMONYX [ NUMONYX B.V ]
