P30-65nm SBC
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
Register data (see Section 6.2, “Device Command Bus Cycles” on page 20 for details on
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)
(1,2)
Item
Address
Data(x16)
Manufacturer Code
0x00
0x01
0x89h
ID (See Table 9)
Lock Bit:
Device ID Code
Block Lock Configuration:
• Block Is Unlocked
DQ0 = 0b0
(1)
• Block Is Locked
BBA
+ 0x02
DQ0 = 0b1
• Block Is not Locked-Down
• Block Is Locked-Down
Read Configuration Register
DQ1 = 0b0
DQ1 = 0b1
0x05
RCR Contents
(3)
(2)
General Purpose Register
Lock Register 0
DBA
+ 0x07
0x80
GPR data
PR-LK0
64-bit Factory-Programmed OTP Register
64-bit User-Programmable OTP Register
0x81–0x84
0x85–0x88
Numonyx Factory OTP Register data
User OTP Register data
Datasheet
22
Apr 2010
Order Number: 208033-02
MICRON [ MICRON TECHNOLOGY ]
