Page program flash memory

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Flash memory: Does the entire page need to be erased before writing just a few bytes? Ask Question. Asked 7 years, 5 months ago. Active 5 years, 11 months ago. Viewed 17k times. I'm not finding any definitive answers JYelton Add a comment. Active Oldest Votes. Dave Tweed Dave Tweed k 16 16 gold badges silver badges bronze badges.

This was just what I was looking for. If you come later and attempt to write zeros in the same "line", the zeros are written, but a new checksum is written over the previous as well; chances are that it has some 1's where the previous had 0's, so the checksum becomes invalid. I don't remember if the MCU permits you to read a line with a bad checksum. Anyway, that would be an example of "vary across devices".

Presumably violating this limit will risk corrupting other areas of memory, so it's important to watch out for such limits. Guill Guill 2, 7 7 silver badges 5 5 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. To accept cookies from this site, please click the Allow button below.

With one click the user can erase, program, and verify an entire device. But what if you only need to program a single sector of a flash memory? This article explains how to use Flash Center to modify a single sector of the device, while not affecting the other sectors. It's first helpful to understand the different programming options provided by Flash Center. For additional information about the Flash Center program modes, take a look at the Flash Center manual.

To program a single sector with Flash Center, we will take advantage of the following properties of flash devices:. By manually erasing specific sectors along with using the Program No Erase mode, data can be written to any sector of a flash device. Each sector has pages or 65, 64K, 0x bytes. Each page has bytes. Therefore, the memory has 16, pages or 4,, 0x bytes. The whole memory can be erased using the Bulk Erase instruction, or a sector at a time, using the Sector Erase instruction.

The following instructions describe how to use the Cheetah SPI Host Adapter to program data to the first sector, then program data to the second sector without overwriting the data in the first.

Total Phase. Register Login. If the device is an SPI Flash, an erase cycle will be performed first. The erase will cover only those sectors which will be written. Note that it is possible to erase more data than is written if a write ends in the middle of a sector. Launch Shell. XSCT Console. Create Boot Image.

Hardware Platform. Select the connection to hardware server. Select a device. Select the file to write to the flash memory. The FSBL. Select a flash type. Please check hardware server connection , is displayed on the dialog box. Based on the device detected, the dialog populates all the flash parts supported for the device.