306666-11 Datasheet, PDF (46/99 Pages) Numonyx B.V – Numonyx StrataFlash Embedded Memory

P30
9.3
Command Definitions
Valid device command codes and descriptions are shown in Table 24.
Table 24: Command Codes and Definitions (Sheet 1 of 2)
Mode
Code
Device Mode
Description
Read
Write
Write
Erase
Suspend
0xFF
0x70
0x90
0x98
0x50
0x40
0x10
0xE8
0xD0
0x80
0xD0
0x20
0xD0
0xB0
0xD0
Read Array
Places the device in Read Array mode. Array data is output on DQ[15:0].
Read Status
Register
Places the device in Read Status Register mode. The device enters this mode
after a program or erase command is issued. Status Register data is output
on DQ[7:0].
Read Device ID
or Configuration
Register
Places device in Read Device Identifier mode. Subsequent reads output
manufacturer/device codes, Configuration Register data, Block Lock status,
or Protection Register data on DQ[15:0].
Read Query
Places the device in Read Query mode. Subsequent reads output Common
Flash Interface information on DQ[7:0].
Clear Status
Register
The WSM can only set Status Register error bits. The Clear Status Register
command is used to clear the SR error bits.
Word Program
Setup
First cycle of a 2-cycle programming command; prepares the CUI for a write
operation. On the next write cycle, the address and data are latched and the
WSM executes the programming algorithm at the addressed location. During
program operations, the device responds only to Read Status Register and
Program Suspend commands. CE# or OE# must be toggled to update the
Status Register in asynchronous read. CE# or ADV# must be toggled to
update the Status Register Data for synchronous Non-array reads. The Read
Array command must be issued to read array data after programming has
finished.
Alternate Word
Program Setup
Equivalent to the Word Program Setup command, 0x40.
Buffered Program
This command loads a variable number of words up to the buffer size of 32
words onto the program buffer.
Buffered Program
Confirm
The confirm command is Issued after the data streaming for writing into the
buffer is done. This instructs the WSM to perform the Buffered Program
algorithm, writing the data from the buffer to the flash memory array.
BEFP Setup
First cycle of a 2-cycle command; initiates Buffered Enhanced Factory
Program mode (BEFP). The CUI then waits for the BEFP Confirm command,
0xD0, that initiates the BEFP algorithm. All other commands are ignored
when BEFP mode begins.
BEFP Confirm
If the previous command was BEFP Setup (0x80), the CUI latches the
address and data, and prepares the device for BEFP mode.
Block Erase Setup
First cycle of a 2-cycle command; prepares the CUI for a block-erase
operation. The WSM performs the erase algorithm on the block addressed by
the Erase Confirm command. If the next command is not the Erase Confirm
(0xD0) command, the CUI sets Status Register bits SR[4] and SR[5], and
places the device in read status register mode.
Block Erase Confirm
If the first command was Block Erase Setup (0x20), the CUI latches the
address and data, and the WSM erases the addressed block. During block-
erase operations, the device responds only to Read Status Register and Erase
Suspend commands. CE# or OE# must be toggled to update the Status
Register in asynchronous read. CE# or ADV# must be toggled to update the
Status Register Data for synchronous Non-array reads
Program or Erase
Suspend
This command issued to any device address initiates a suspend of the
currently-executing program or block erase operation. The Status Register
indicates successful suspend operation by setting either SR[2] (program
suspended) or SR[6] (erase suspended), along with SR[7] (ready). The Write
State Machine remains in the suspend mode regardless of control signal
states (except for RST# asserted).
Suspend Resume
This command issued to any device address resumes the suspended program
or block-erase operation.
Datasheet
46
November 2007
Order Number: 306666-11