JS28F128P33TF70 datasheet(16/88 Pages) NUMONYX

16 / 88 page

P33-65nm

Datasheet

Jul 2011

Order Number: 208034-04

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 5,

“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.

Some applications use illegal or invalid commands (like 0x00) accidentally or

intentionally with the device. An illegal or invalid command doesn't change the device

output state compared with the previous operation on 130nm device. But the output

will change to Read Status Register mode on 65nm device.

After an illegal or invalid command, software may attempt to read the device. If the

previous state is read array mode before an illegal command, software will expect to

read array data on 130nm device, such as 0xFFFF in an unprogrammed location. On

the 65nm device, software may not get the expected array data and instead the status

Please refer to the legal and valid commands/spec defined in the Datasheet, such as for

read mode, issue 0xFF to Read Array mode, 0x90 to Read Signature, 0x98 to Read CFI/

OTP array mode.

Table 5:

Command Codes and Definitions (Sheet 1 of 3)

Mode

Code

Device Mode

Description

Read

0xFF

Read Array

Places the device in Read Array mode. Array data is output on DQ[15:0].

0x70

Read Status

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].

0x90

Read Device ID

or Configuration

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].

0x98

Read Query

Places the device in Read Query mode. Subsequent reads output Common

Flash Interface information on DQ[7:0].

0x50

Clear Status

The WSM can only set SR error bits. The Clear Status Register command is

used to clear the SR error bits.

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