JS28F128P30TF75A datasheet(22/90 Pages) MICRON

22 / 90 page

P30-65nm SBC

Datasheet

Apr 2010

Order Number: 208033-02

7.0

Read Operation

The device can be in any of four read states: Read Array, Read Identifier, Read Status

or Read Query. Upon power-up or after a reset, the device defaults to Read Array

mode. To change the read state, the appropriate read command must be written to the

device (see Section 6.2, “Device Command Bus Cycles” on page 20). The following

sections describe read-mode operations in detail.

In order to enable synchronous burst reads, the RCR must be configured. Please see

Section 11.2, “Read Configuration Register (RCR)” on page 34 for RCR detail. Please

refer to Section 5.1, “Read - Asynchronous Mode” on page 16 and Section 5.2, “Read -

Synchronous Mode” on page 16 for bus operation detail. See Section 25, “AC Read

Specifications” on page 50 for timing specification.

7.1

Read Array

Following a device power-up or reset, the device is set to Read Array mode. However,

to perform array reads after any other device operation (e.g. write operation), the Read

Array command must be issued in order to read from the flash memory array. Please

refer to Section 5.1, “Read - Asynchronous Mode” on page 16 and Section 5.2, “Read -

Synchronous Mode” on page 16 for bus operation detail. See Section 25, “AC Read

Specifications” on page 50 for timing specification.

7.2

Read Device Identifier

The Read Device Identifier command instructs the device to output manufacturer code,

device identifier code, block-lock status, OTP Register data, or Read Configuration

issuing the Read Device Identifier command). Table 8, “Device Identifier Information”

on page 22 and Table 9, “Device ID codes” on page 23 show the address offsets and

data values for this device.

Table 8:

Device Identifier Information (Sheet 1 of 2)

Item

Address(1,2)

Data(x16)

Manufacturer Code

0x00

0x89h

Device ID Code

0x01

ID (See

Table 9)

Block Lock Configuration:

BBA(1) + 0x02

Lock Bit:

• Block Is Unlocked

DQ0 = 0b0

• Block Is Locked

DQ0 = 0b1

• Block Is not Locked-Down

DQ1 = 0b0

• Block Is Locked-Down

DQ1 = 0b1

Read Configuration Register

0x05

RCR Contents

General Purpose Register(3)

DBA(2) + 0x07

GPR data

Lock Register 0

0x80

PR-LK0

64-bit Factory-Programmed OTP Register

0x81–0x84

Numonyx Factory OTP Register data

64-bit User-Programmable OTP Register

0x85–0x88

User OTP Register data

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