Numonyx™ Wireless Flash Memory (W18)
Table 24: Device Identification Codes (Sheet 2 of 2)
Address
1
Item
Base
Protection Register Lock Status
Protection Register
Partition
Partition
Offset
80h
81h - 88h
Lock Data
Register Data
Multiple reads required to read the
entire 128-bit Protection Register.
Data
Description
Notes:
1.
The address is constructed from a base address plus an offset. For example, to read the Block Lock Status for block
number 38 in a BPD, set the address to the BBA (0F8000h) plus the
offset
(02h), i.e. 0F8002h. Then examine bit 0 of
the data to determine if the block is locked.
2.
See
for valid lock status.
10.5
CFI Query
This device contains a separate CFI query
database
that acts as an “on-chip datasheet.”
The CFI information within this device can be accessed by issuing the Read Query
command and supplying a specific address. The address is constructed from the base
address of a partition plus a particular offset corresponding to the desired CFI field.
shows accessible CFI fields
and their address offsets.
Issuing the Read Query command to a partition that is programming or erasing puts
that partition in read query mode while the partition continues to program or erase in
the background.
10.6
Read Status Register
The device’s Status Register displays program and erase operation status. A partition’s
status can be read after writing the Read Status Register command to any location
within the partition’s address range. Read-status mode is the default read mode
following a Program, Erase, or Lock Block command sequence. Subsequent single reads
from that partition will return its status until another valid command is written.
The read-status mode supports single synchronous and single asynchronous reads
only; it doesn’t support burst reads. The first falling edge of OE# or CE# latches and
updates Status Register data. The operation doesn’t affect other partitions’ modes.
Because the Status Register is 8 bits wide, only DQ [7:0] contains valid Status Register
data; DQ [15:8] contains zeros. See
and
Each 4-Mbit partition contains its own Status Register. Bits SR[6:0] are unique to each
partition, but SR[7], the Device WSM Status (DWS) bit, pertains to the entire device.
SR[7] provides program and erase status of the entire device. By contrast, the Partition
WSM Status (PWS) bit, SR[0], provides program and erase status of the
addressed
partition
only. Status register bits SR[6:1] present information about partition-specific
program, erase, suspend, V
PP
, and block-lock states.
presents descriptions of DWS
(SR[7]) and PWS (SR[0]) combinations.
Table 25: Status Register Definitions
DWS
7
ESS
6
ES
5
PS
4
VPPS
3
PSS
2
DPS
1
PWS
0
November 2007
Order Number: 290701-18
Datasheet
57
NUMONYX [ NUMONYX B.V ]
