MD4331-d1G-MECH M-Systems Inc., MD4331-d1G-MECH Datasheet - Page 35

• Manufacturer Part Number: MD4331-d1G-MECH
• Description: Mobile Diskonchip G3 Data Sheet
• Manufacturer: M-Systems Inc.

related applications, and can be used to identify end-user products in order to fight fraudulent
duplication by imitators.
3.4.3
The 6KB OTP area is user programmable for complete customization. The user can write to this
area once, after which it is automatically and permanently locked. After it is locked, the OTP area
becomes read only, just like a ROM device.
Typically, the OTP area is used to store customer and product information such as: product ID,
software version, production data, customer ID and tracking information.
3.4.4
A single partition in the Mobile DiskOnChip G3 can be set as One-Time Write. After it is locked,
this partition becomes read only, just like a ROM device. Its capacity is defined during the media-
formatting stage.
3.4.5
The boot partition can be locked automatically by hardware after the boot phase is completed and
the device is in Normal mode. This is done by setting the Sticky Lock (SLOCK) bit in the Output
Control register to 1. This has the same effect as asserting the LOCK# signal. Once set, SLOCK can
only be cleared by asserting the RSTIN# input. Like the LOCK# input, assertion of this bit prevents
the protection key from disabling the protection for a given partition. There is no need to mount the
boot partition before calling a hardware protection routine.
Upon reset, the boot partition is unlocked for the duration of the boot phase, and is automatically
locked once this phase is over. This provides a high level of protection to the boot code, while still
enabling an easy method for field and remote upgrades.
3.5
The Programmable Boot Block with XIP functionality enables Mobile DiskOnChip G3 to act as a
boot device in addition to performing flash disk data storage functions. This eliminates the need for
expensive, legacy NOR flash or any other boot device on the motherboard.
The Programmable Boot Block on Mobile DiskOnChip G3 512Mb is 2KB in size (4KB for dual-die
1Gb devices). The Download Engine (DE), described in the next section, expands the functionality
of this block by copying the boot code from the flash into the boot block.
DiskOnChip G3 512Mb devices may be cascaded in order to form a larger flash disk. When Mobile
DiskOnChip G3 512Mb is connected with a standard NOR-like interface, up to four devices may be
cascaded to create a 2Gb flash disk. When Mobile DiskOnChip G3 512Mb is connected with a
multiplexed interface, up to two devices may be cascaded to create a 1Gb flash disk.
Notes: 1. When more than one Mobile DiskOnChip G3 512Mb are cascaded, a maximum boot
32
One-Time Programmable (OTP) Area
One-Time Write (ROM-Like) Partition
Sticky Lock (SLOCK)
Programmable Boot Block with eXecute In Place (XIP) Functionality
2. The Programmable Boot Block size available for Mobile DiskOnChip G3 1Gb (dual-die)
block of 4KB is available. The Programmable Boot Block of each device is mapped to a
unique address space.
is 4 KB.
Data Sheet, Rev. 1.0
Mobile DiskOnChip G3
91-SR-011-05-8L