MD8331-D2G-V3-X-P SanDisk, MD8331-D2G-V3-X-P Datasheet - Page 22

• Manufacturer Part Number: MD8331-D2G-V3-X-P
• Description: IC MDOC G4 2GB 69-FBGA
• Manufacturer: SanDisk

Specifications of MD8331-D2G-V3-X-P

• Format - Memory: FLASH
• Memory Type: FLASH - Nand
• Memory Size: 2G (256M x 8)
• Speed: 33ns
• Interface: Parallel
• Voltage - Supply: 2.5 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 69-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 585-1149-2; MD8831-D2G-V3-X-P; MD8832-D2G-V3-X-P

3.4.4
A partition in the DiskOnChip G4 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
partition before calling a hardware protection routine.
This feature can be useful when the boot code in the boot partition must be read/write protected.
Upon power-up, the boot code must be unprotected so the CPU can boot directly from DiskOnChip.
At the end of the boot process, protection can be set until the next power-up or reset
3.5
The Programmable Boot Block with XIP functionality enables DiskOnChip G4 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 DiskOnChip G4 is 2KB in size. 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 G4 128MB (1Gb) devices may be cascaded in order to form a larger flash disk. When
DiskOnChip G4 128MB (1Gb) is connected with a standard NOR-like interface, up to four devices
may be cascaded to create a 4Gb flash disk. When DiskOnChip G4 128MB (1Gb) is connected with
a multiplexed interface, up to two devices may be cascaded to create a 256MB (2Gb) flash disk.
Notes: 1. When more than one DiskOnChip G4 128MB (1Gb) device is cascaded, a maximum
3.6
Upon power-up or when the RSTIN# signal is asserted, the DE automatically downloads the Initial
Program Loader (IPL) to the Programmable Boot Block. The IPL is responsible for starting the
booting process. The download process is quick, and is designed so that when the CPU accesses
DiskOnChip G4 for code execution, the IPL code is already located in the Programmable Boot
Block. During the download process, DiskOnChip G4 does not respond to read or write accesses.
Host systems must therefore observe the requirements described in Section 10.3.8.
In addition, the DE downloads the data protection rules from the flash to the Protection State
Machines (PSM), so that DiskOnChip G4 is secure and protected from the first moment it is active.
22
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 DiskOnChip G4 256MB (2Gb) is 2 KB
Download Engine (DE)
boot block of 2KB is available.
as well.
Data Sheet (Preliminary) Rev. 0.3
DiskOnChip G4 128MB (1Gb)/256MB (2Gb) 1.8V
.
92-DS-1105-00