P30-65nm SBC
6.0
Command Set
6.1
Device Command Codes
The flash Command User Interface (CUI) provides access to device read, write, and
erase operations. The CUI does not occupy an addressable memory location; it is part
of the internal logic which allows the flash device to be controlled. The Write State
Machine provides the management for its internal erase and program algorithms.
Commands are written to the CUI to control flash device operations. Table 6,
“Command Codes and Definitions” describes all valid command codes.
For operations that involve multiple command cycles, the possibility exists that the
subsequent command does not get issued in the proper sequence. When this happens,
the CUI sets Status Register bits SR[5,4] to indicate a command sequence error.
Table 6:
Command Codes and Definitions (Sheet 1 of 2)
Mode
Code
Device Mode
Read Array
Description
0xFF
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. SR data is output on DQ[7:0].
0x70
Read Device ID
or Read
Configuration
Register (RCR)
Places device in Read Device Identifier mode. Subsequent reads output
manufacturer/device codes, Configuration Register data, Block Lock status,
or OTP Register data on DQ[15:0].
0x90
Read
Places the device in Read Query mode. Subsequent reads output Common
Flash Interface (CFI) information on DQ[7:0].
0x98
0x50
Read CFI
Clear Status
Register
The WSM can only set SR error bits. The Clear Status Register command is
used to clear the SR error bits.
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 SR Data for synchronous Non-array reads. The Read Array
command must be issued to read array data after programming has finished.
Word Program
Setup
0x40
This command loads a variable number of words up to the buffer size of 256
words onto the program buffer.
0xE8
0xD0
Buffered Program
Write
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.
Buffered Program
Confirm
First cycle of a 2-cycle command; initiates the BEFP mode. The CUI then
waits for the BEFP Confirm command, 0xD0, that initiates the BEFP
algorithm. All other commands are ignored when BEFP mode begins.
0x80
0xD0
0x20
BEFP Setup
If the previous command was BEFP Setup (0x80), the CUI latches the
address and data, and prepares the device for BEFP mode.
BEFP Confirm
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 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
SR Data for synchronous Non-array reads.
Erase
0xD0
Block Erase Confirm
Datasheet
19
Apr 2010
OrderNumber:208033-02
MICRON [ MICRON TECHNOLOGY ]
