HN29V1G91T-30 Datasheet, PDF (87/92 Pages) Renesas Technology Corp – 128M X 8-bit AG-AND Flash Memory

HN29V1G91T-30
9. Unusable Block
Initially, the HN29V1G91T includes unusable blocks. The usable blocks must be distinguished from the
usable blocks bye the system as follows.
1. Confirm the blocks which cannot be used after mounting on the system. The following data is written
on each page of the blocks which can be used. One block is composed of two pages, and following
data is written in both pages commonly (Refer to “The Unusable Blocks Indication Flow”).
Initial Data of Usable Pages
Column address 0h to 81Fh 820h
Data
FFh
1Ch
821h
71h
822h
C7h
823h
1Ch
824h
71h
825h
C7h
826h to 83Fh
FFh
2. Do not Program and Erase to the partial invalid blocks by the system.
Start
k=0
m=0
n=0
NO
Bad block^*2
NO
Page number = (8k + m + n)
Check data ^*1
YES
n=n+4
Check data *¹
YES
m=m+1
NO
m=4
YES
k=k+1
NO
k = 8192
YES
END
Notes: 1. Refer to table "Initial data of usable pages".
2. Bad pages are installed in system.
The Unusable Blocks Indication Flow
Rev.4.00, Jun.20.2004, page 87 of 89