MD3331-D32-V3Q18 M-Systems Inc., MD3331-D32-V3Q18 Datasheet - Page 30

• Manufacturer Part Number: MD3331-D32-V3Q18
• Description: Mobile Diskonchip Plus 128Mbits 1.8V I/o
• Manufacturer: M-Systems Inc.

6.3
TrueFFS utilizes an 8KB memory window in the CPU address space consisting of four 2KB sections, as depicted in
Figure 11. When in Reset mode, the Programmable Boot Block in sections 0 and 3 will show the IPL (1KB) of the
first 16MB of the dual die, aliased twice. Read cycles from sections 1 and 2 always return the value 00H to create a
fixed and known checksum.
After setting the MAX_ID field in the Configuration register (done by IPL0), the second copy of IPL0 is replaced
with the IPL of the second 16MB device of the dual die, thereby creating a 2KB Programmable Boot Block.
When in Normal mode, sections 1 and 2 are used for the internal registers. The Programmable Boot Block in
section 0 contains IPL0 and IPL1. Section 3 contains IPL0 aliased twice.
The addresses described here are relative to the absolute starting address of the 8KB memory window.
30
8KB Memory Window for Mobile DiskOnChip Plus 32MB
Figure 12: Mobile DiskOnChip Plus 32MB Memory Map
1000H
1800H
000H
800H
Programmable
Programmable
[000H-3FFH]
Reset Mode
(2 aliases)
boot block
(2 aliases)
boot block
00H
00H
[IPL]
Data Sheet, Rev. 1.7
Section 0
Section 1
Section 2
Section 3
Programmable
Programmable
Normal Mode
Flash area
(+ aliases)
(+ aliases)
[IPL0, IPL1]
[IPL0, IPL1]
Registers
boot block
(2 aliases)
boot block
window
Control
Mobile DiskOnChip Plus 16/32MByte 1.8V I/O
95-SR-000-10-8L