IT8502F View Datasheet(PDF) - ITE Tech. INC.
Part Name
Description
MFG CO.
'IT8502F' PDF : 398 Pages View PDF
System Block Diagram
3.2 Host/EC Mapped Memory Space
(byte)
FFFF_FFFFh
FFFF_0000h
FFFE_FFFFh
FFFE_0000h
FFFD_FFFFh
Variable, not necessary
on 32k boundary
1_0000_0000h - Flash_Size
FFFF_FFFFh - Flash_Size
Figure 3-1. Host/Flash and EC/Flash Mapping (General)
Host Memory Space
4G Top
RANGE 1
RANGE 2
RANGE 3
(byte)
Flash_Size - 1
64k
Flash_Size - 01_0000h
Flash_Size - 01_0001h
64k
Flash_Size - 02_0000h
Flash_Size - 02_0001h
Flash_Size
Expansion Flash Space
Flash Space Top
RANGE 1
RANGE 2
RANGE 3
EC
Code Memory Space
The range 4 shows space used by EC code and five banks are
all used.
The interface line will be lower if EC code size is smaller than 160K.
RANGE 4
EC Code:
Max 160k
Variable, not necessary
on 32k boundary
00_0000h
RANGE 4
(byte)
Bank 3 (32k)
Bank 2 (32k)
Bank 1 (32k)
Bank 0 (32k)
FFFFh
Bank 0 Bank 1 Bank 2 Bank 3 32k
8000h
7FFFh
Common Bank
32k
Common Bank (32k) 0000h
Out of Range
These five banks are arranged in order and totally 160K mapped.
Each bank is always mapped but it is only valid if it is used by EC code.
If EC code size <= 64K, Bank 0 is valid to be selected.
If EC code size <= 96K, Bank 0-1 are valid to be selected.
If EC code size <= 128K, Bank 0-2 are valid to be selected.
If EC code size <= 160K, Bank 0-3 are valid to be selected.
If EC code size is not multiple of 32K, the remainder can be
used by host memory.
Bank 0, 1, 2 and 3 occupy the same code memory space.
Only one of these four banks can be selected at once time.
It is selected by ECBB or P1 register.
000F_FFFFh
RANGE 1
64k
000F_0000h
000E_FFFFh
RANGE 2
64k
000E_0000h
000D_FFFFh
Out of Range
0000_0000h
www.ite.com.tw
5
IT8502E/F/G V0.7.7
Share Link: 
