Specifications

26 GL-S MirrorBit
®
Family IS29GL_128S_01GS_00_Rev.A February 2015
Data Sheet
5.2 Program and Erase Summary
Flash data bits are erased in parallel in a large group called a sector. The Erase operation places each data
bit in the sector in the logical 1 state (High). Flash data bits may be individually programmed from the erased
1 state to the programmed logical 0 (low) state. A data bit of 0 cannot be programmed back to a 1. A
succeeding read shows that the data is still 0. Only erase operations can convert a 0 to a 1. Programming the
same word location more than once with different 0 bits will result in the logical AND of the previous data and
the new data being programmed.
The duration of program and erase operations is shown in Embedded Algorithm Performance Table
on page 46.
Program and erase operations may be suspended.
 An erase operation may be suspended to allow either programming or reading of another sector (not in the
erase sector). No other erase operation can be started during an erase suspend.
 A program operation may be suspended to allow reading of another location (not in the Line being
programmed).
 No other program or erase operation may be started during a suspended program operation - program or
erase commands will be ignored during a suspended program operation.
 After an intervening program operation or read access is complete the suspended erase or program
operation may be resumed. The resume can happen at any time after the suspend assuming the device is
not in the process of executing another command.
 Program and Erase operations may be interrupted as often as necessary but in order for a program or
erase operation to progress to completion there must be some periods of time between resume and the
next suspend commands greater than or equal to t
PRS
or t
ERS
in Embedded Algorithm Performance Table
on page 46.
 When an Embedded Algorithm (EA) is complete, the EAC returns to the operation state and address space
from which the EA was started (Erase Suspend or EAC Standby).
The system can determine the status of a program or erase operation by reading the Status Register or using
Data Polling Status. Refer to Status Register on page 37 for information on these status bits. Refer to Data
Polling Status on page 38 for more information.
Any commands written to the device during the Embedded Program Algorithm are ignored except the
Program Suspend, and Status Read command.
Any commands written to the device during the Embedded Erase Algorithm are ignored except Erase
Suspend and Status Read command.
A hardware reset immediately terminates any in progress program / erase operation and returns to read
mode after t
RPH
time. The terminated operation should be reinitiated once the device has returned to the idle
state, to ensure data integrity.
For performance and reliability reasons reading and programming is internally done on full 32-byte Pages.
I
CC3
in DC Characteristics on page 74 represents the active current specification for a write (Embedded
Algorithm) operation.
5.2.1 Program Granularity
The IS29GL-S supports two methods of programming, Word or Write Buffer Programming. Each Page can be
programmed by either method. Pages programmed by different methods may be mixed within a Line for the
Industrial Temperature version (-40°C to +85°C). For the In-Cabin version (-40°C to +105°C) the device will
only support one programming operation on each 32-byte page between erase operations and Single Word
Programming command is not supported.
Word programming examines the data word supplied by the command and programs 0’s in the addressed
memory array word to match the 0’s in the command data word.
Write Buffer Programming examines the write buffer and programs 0’s in the addressed memory array Pages
to match the 0’s in the write buffer. The write buffer does not need to be completely filled with data. It is
allowed to program as little as a single bit, several bits, a single word, a few words, a Page, multiple Pages, or
the entire buffer as one programming operation. Use of the write buffer method reduces host system