S29GL01GP datasheet(35/81 Pages) SPANSION

35 / 81 page

October 22, 2012 S29GL-P_00_A14

S29GL-P MirrorBit® Flash Family

Data

She e t

7.7.7

Accelerated Program

Accelerated single word programming and write buffer programming operations are enabled through the

WP#/ACC pin. This method is faster than the standard program command sequences.

Note

The accelerated program functions must not be used more than 10 times per sector.

If the system asserts VHH on this input, the device automatically enters the aforementioned Unlock Bypass

mode and uses the higher voltage on the input to reduce the time required for program operations. The

system can then use the Write Buffer Load command sequence provided by the Unlock Bypass mode. Note

that if a “Write-to-Buffer-Abort Reset” is required while in Unlock Bypass mode, the full 3-cycle RESET

command sequence must be used to reset the device. Removing VHH from the ACC input, upon completion

of the embedded program operation, returns the device to normal operation.

 Sectors must be unlocked prior to raising WP#/ACC to V

HH.

 The WP#/ACC pin must not be at V

HH for operations other than accelerated programming, or device

damage may result.

 It is recommended that WP#/ACC apply V

HH after power-up sequence is completed. In addition, it is

recommended that WP#/ACC apply from VHH to VIH/VIL before powering down VCC/VIO.

7.7.8

Unlock Bypass

This device features an Unlock Bypass mode to facilitate shorter programming commands. Once the device

enters the Unlock Bypass mode, only two write cycles are required to program data, instead of the normal

four cycles.

This mode dispenses with the initial two unlock cycles required in the standard program command sequence,

resulting in faster total programming time. The Command Definitions on page 68 shows the requirements for

the unlock bypass command sequences.

During the unlock bypass mode, only the Read, Program, Write Buffer Programming, Write-to-Buffer-Abort

Reset, Unlock Bypass Sector Erase, Unlock Bypass Chip Erase and Unlock Bypass Reset commands are

valid. To exit the unlock bypass mode, the system must issue the two-cycle unlock bypass reset command

sequence. The first cycle address is “don't care” and the data 90h. The second cycle need only contain the

data 00h. The sector then returns to the read mode.

Software Functions and Sample Code

The following are C source code examples of using the unlock bypass entry, program, and exit functions.

Refer to the Spansion Low Level Driver User’s Guide (available soon on www.spansion.com) for general

information on Spansion Flash memory software development guidelines.

/* Example: Unlock Bypass Entry Command

*( (UINT16 *)base_addr + 0x555 ) = 0x00AA;

/* write unlock cycle 1

*( (UINT16 *)base_addr + 0x2AA ) = 0x0055;

/* write unlock cycle 2

*( (UINT16 *)base_addr + 0x555 ) = 0x0020;

/* write unlock bypass command

/* At this point, programming only takes two write cycles.

/* Once you enter Unlock Bypass Mode, do a series of like

/* operations (programming or sector erase) and then exit

/* Unlock Bypass Mode before beginning a different type of

/* operations.

Table 7.14 Unlock Bypass Entry

(LLD Function = lld_UnlockBypassEntryCmd)

Cycle

Description

Operation

Byte Address

Word Address

Data

Unlock

Write

Base + AAAh

Base + 555h

00AAh

Unlock

Write

Base + 555h

Base + 2AAh

0055h

Entry Command

Write

Base + AAAh

Base + 555h

0020h

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