Functional Description; Figure 6.4-2 Memory Organization; Figure 6.4-3 Data Flash Shared With 512 Kb Aprm Example - Nuvoton ISD94124BYI Technical Reference Manual

6.4.4

Functional Description

This section describes ISD94100 series flash memory controller's functions including memory
organization, boot configuration, IAP, ISP, Flash read/write operation, checksum calculation, and so on.
6.4.4.1 Memory Organization
0x0030_000B
0x0030_0000
0x0010_FFFF
0x0010_0000
0x0007_FFFF
DFBA
0x0000_0000
APROM and Data Flash
APROM is main memory for user applications. Data Flash is used to store application parameters
(not instruction). Data Flash is shared with APROM and size is configurable. The base address of
Data Flash is determined by DFBA (CONFIG1[19:0]). All of the embedded Flash memory is 4 KB
page erased.
If DFEN bit = 1, the whole flash size will be assigned as APROM; if DFEN bit = 0, then area from
0x0000_0000 to DFBA-1 will be assigned to APROM, and the remaining flash size will be assigned
as Data Flash. See Configuration Bytes description for the definition of DFEN and DFBA.
0x0007_FFFF
0x0000_0000
EXAMPLE:

Figure 6.4-3 Data Flash Shared with 512 KB APRM example

Sep 9, 2019
ISD94100 Series Technical Reference Manual
Configuration
Bytes
LDROM
Data Flash
(4*N)KB
ApplicationROM
(APROM)

Figure 6.4-2 Memory Organization

ApplicationROM
(APROM)
DFEN=1
APROM only
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Configure: security lock, boot
select, brown-out voltage, data
flash base address(DFBA), etc.
Loader ROM
Application data
Application ROM
Data Flash
(4*N)KB
DFBA
ApplicationROM
(APROM)
DFEN=0
vs. APROM + Data flash
Rev1.09