256Mb and 512Mb (256Mb/256Mb), P30-65nm
Registers
Registers
When non-array reads are performed in asynchronous page mode only the first data is
valid and all subsequent data are undefined. When a non-array read operation occurs
as synchronous burst mode, the same word of data requested will be output on succes-
sive clock edges until the burst length requirements are satisfied.
Read Status Register
To read the Status Register, issue the Read Status Register command at any address. Sta-
tus Register information is available to which the Read Status Register, Word Program,
or Block Erase command was issued. Status Register data is automatically made availa-
ble following a Word Program, Block Erase, or Block Lock command sequence. Reads
from the device after any of these command sequences outputs the device’s status until
another valid command is written (e.g. Read Array command).
The Status Register is read using single asynchronous-mode or synchronous burst
mode reads. Status Register data is output on DQ[7:0], while 0x00 is output on DQ[15:8].
In asynchronous mode the falling edge of OE#, or CE# (whichever occurs first) updates
and latches the Status Register contents. However, reading the Status Register in syn-
chronous burst mode, CE# or ADV# must be toggled to update status data.
The Device Write Status bit (SR.7) provides overall status of the device. Status register
bits SR[6:1] present status and error information about the program, erase, suspend,
V
PP
, and block-locked operations.
Table 16: Status Register Description
Bit
7
6
5
Name
Device Ready Status
(DWS)
Erase Suspend Status
(ESS)
Erase /Blank
Check Status
(ES)
Program Sta-
tus (PS)
Description
0 = Device is busy; program or erase cycle in progress; SR.0 valid.
1 = Device is ready; SR[6:1] are valid.
0 = Erase suspend not in effect.
1 = Erase suspend in effect.
SR.4
Description
Command SR.5
Sequence
Error
0
0
1
1
4
0
1
0
1
Program or Erase operation successful.
Program error - operation aborted.
Erase or Blank check error - operation aborted.
Command sequence error - command aborted.
3
2
1
0
V
PP
Status (VPPS)
Program Suspend Status
(PSS)
0 = VPP within acceptable limits during program or erase operation.
1 = VPP
≤
VPPLK during program or erase operation.
0 = Program suspend not in effect.
1 = Program suspend in effect.
Block-Locked Status (BLS) 0 = Block not locked during program or erase.
1 = Block locked during program or erase; operation aborted.
BEFP Status (BWS)
After Buffered Enhanced Factory Programming (BEFP) data is loaded into the buffer:
0 = BEFP complete.
1 = BEFP in-progress.
1. Default Value = 0x80
Notes:
PDF: 09005aef84566799
p30_65nm_256Mb-512mb.pdf - Rev. A 1/13 EN
43
Micron Technology, Inc. reserves the right to change products or specifications without notice.
©
2013 Micron Technology, Inc. All rights reserved.
MICRON [ MICRON TECHNOLOGY ]
