---
title: "Code Flash Programming - Sector Size"
url: "https://maker.wiznet.io/forum/10882"
markdown_url: "https://maker.wiznet.io/forum/10882/md"
type: "Forum topic"
category: "MCU & Boards"
author: "eNDi"
created: "2015-03-03T10:34:38+09:00"
last_activity: "2017-05-04T08:35:45+09:00"
language: "en"
views: 913
replies: 2
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Code Flash Programming - Sector Size

## Question

Asked by eNDi on 2015-03-03 in MCU & Boards.

According to the documentation “How to Program Code Flash Memory in W7100A” ISP_SERASE(0x30) erases a code flash sector of 256 Byte.
Is this correct? In the sample codes (iap.c) a size of 1024 Bytes is assumed.

## Replies

### Reply 1 by irina, 2015-04-13

Hi eNDi.
W7100A Code flash sector size for erase - 256Byte per one-sector is correct.
Please refer to latest W7100A Application note; sample code version 1.51.

Regards,
Eric.

### Reply 2 by irina, 2015-05-26

<< Corrections >>
As a result of the recheck, W7100A Code flash sector size for erase is 1024 Byte per one-sector.
I apologize for the wrong informations.

Regards,
Eric.

---

Source: https://maker.wiznet.io/forum/10882