P30-65nm SBC
Figure 35: Buffer Program Flowchart
Start
Bus
Operation
Command
Comments
Data =E8H
Write to
Buffer
Write
Device
Supports Buffer
Writes?
Addr = Block Address
Use Single Word
Programming
No
SR. 7 = Valid
Read
Addr = Block Address
(Note 7)
Yes
Check SR.7
1 = Device WSM is Busy
0 = Device WSM is Ready
Set Timeout or
Loop Counter
Standby
Yes
Data =N-1 = Word Count
N = 0 corresponds to count=1
Addr = Block Address
Write
( Notes1 , 2)
Clear Status Register
50h
Address within Device
Write
Data = Write Buffer Data
( Notes3 , 4)
Addr =Address within buffer range
Get Next
Target Address
Write
( Notes5 , 6)
Data = Write Buffer Data
Addr = Block Address
Issue Write to Buffer
Command E8h
Block Address
Program
Confirm
Data =D0H
Addr = Block Address
Write
Read
Status register Data
CE# and OE# low updates SR
Addr = Block Address
Read Status Register
Block Address
(note 7)
Check SR.7
1 = WSM Ready
0 = WSM Busy
No
Standby
Notes:
Timeout
or Count
Expired ?
0 = No
Is WSM Ready?
SR. 7=
Yes
1. Word count values on DQ0-DQ15 are loaded into the Count
register. Count ranges for this device are N=0000h to 00FFh.
.
1 =Yes
2. The device outputs the Status Register when read.
Write Word Count
Block Address
3. Write Buffer contents will be programmed at the device start
address or destination flash address .
Write Buffer Data
Start Address
X = X +1
4. Align the start address on a Write Buffer boundary for
maximum programming performance (i.e., A8-A1 of the start
address =0).
Write Buffer Data
.
X =0
Address within buffer range
5. The device aborts the Buffered Program command if the
current address is outside the original block address .
No
.
6. The Status register indicates an “improper command
Sequence” if the Buffered Program command is aborted.
Follow this with a Clear Status Register command .
No
Abort Bufferred
Program?
X =N?
Yes
Yes
7. The device defaults to output SR data after the Buffered
Programming Setup Command (E8h) is issued . CE# or OE#
must be be toggled to update Status Register. Don’t issue the
Read SR command (70h), which would be interpreted by the
internal state machine as Buffer Word Count.
Write Confirm D0h
Block Address
Write to another
Block Address
Buffered Program
Aborted
8. Full status check can be done after all erase and write
sequences complete . Write FFh after the last operation to
reset the device to read array mode.
Read Status Register
No
Suspend
Program
Loop
Yes
Suspend
Program
0
SR. 7=?
1
Full Status
Check if Desired
Yes
Another Buffered
Programming?
No
Program Complete
Datasheet
76
Apr 2010
Order Number: 208033-02
MICRON [ MICRON TECHNOLOGY ]
