S29GL01GP datasheet(28/82 Pages) CYPRESS

28 / 82 page

Document Number: 002-00886 Rev. *B

Page 28 of 83

S29GL01GP

S29GL512P

S29GL256P

S29GL128P

7.7.5

Erase Suspend/Erase Resume Commands

The Erase Suspend command allows the system to interrupt a sector erase operation and then read data from, or program data to,

any sector not selected for erasure. The sector addresses are “don't-cares” when writing this command. This command is valid only

during the sector erase operation, including the tSEA time-out period during the sector erase command sequence. The Erase

Suspend command is ignored if written during the chip erase operation.

When the Erase Suspend command is written during the sector erase operation, the device requires a maximum of 20

µs (5µs

typical) to suspend the erase operation. However, when the Erase Suspend command is written during the sector erase time-out,

the device immediately terminates the time-out period and suspends the erase operation.

After the erase operation has been suspended, the device enters the erase-suspend-read mode. The system can read data from or

program data to any sector not selected for erasure. (The device “erase suspends” all sectors selected for erasure.) Reading at any

address within erase-suspended sectors produces status information on DQ7-DQ0. The system can use DQ7, or DQ6, and DQ2

together, to determine if a sector is actively erasing or is erase-suspended. Refer to Table 7.35 for information on these status bits.

After an erase-suspended program operation is complete, the device returns to the erase-suspend-read mode. The system can

determine the status of the program operation using write operation status bits, just as in the standard program operation.

In the erase-suspend-read mode, the system can also issue the Autoselect command sequence. Refer to Write Buffer Programming

on page 23 and the Autoselect on page 17 for details.

To resume the sector erase operation, the system must write the Erase Resume command. The address of the erase-suspended

sector is a “don't-care” when writing this command. Further writes of the Resume command are ignored. Another Erase Suspend

command can be written after the chip has resumed erasing.

Software Functions and Sample Code

The following is a C source code example of using the erase suspend function. Refer to the Cypress Low Level Driver User’s Guide

(available on www.cypress.com) for general information on Cypress Flash memory software development guidelines.

/* Example: Erase suspend command */

*( (UINT16 *)base_addr ) = 0x00B0;

/* write suspend command

The following is a C source code example of using the erase resume function. Refer to the Cypress Low Level Driver User’s Guide

(available on www.cypress.com) for general information on Cypress Flash memory software development guidelines.

/* Example: Erase resume command */

*( (UINT16 *)sector_addr ) = 0x0030;

/* write resume command

/* The flash needs adequate time in the resume state */

Erase Suspend

(LLD Function = lld_EraseSuspendCmd)

Cycle

Operation

Byte Address

Word Address

Data

Write

Base + XXXh

00B0h

Erase Resume

(LLD Function = lld_EraseResumeCmd)

Cycle

Operation

Byte Address

Word Address

Data

Write

Sector Address

0030h

S29GL01GP Datasheet(PDF) 28 Page - Cypress Semiconductor

S29GL01GP Datasheet(HTML) 28 Page - Cypress Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

Datasheet Download

Link URL