MD2433-D8G-V3Q18-X-P SanDisk, MD2433-D8G-V3Q18-X-P Datasheet - Page 38

• Manufacturer Part Number: MD2433-D8G-V3Q18-X-P
• Description: IC MDOC H1 8GB 115-FBGA
• Manufacturer: SanDisk

Specifications of MD2433-D8G-V3Q18-X-P

• Format - Memory: FLASH
• Memory Type: FLASH - Nand
• Memory Size: 8G (1G x 8)
• Speed: 64ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -30°C ~ 85°C
• Package / Case: 115-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.
6.1
mDOC H1 can function both as a flash disk and as the system boot device.
If mDOC H1 is configured as a flash disk and as the system boot device, it contains the boot loader,
an OS image and a file system. In such a configuration, mDOC H1 can serve as the only non-
volatile device on board.
6.2
In common CPU architecture, the boot code is executed from a boot ROM, and the drivers are
usually loaded from the storage device.
When using mDOC H1 as the system boot device, the CPU fetches the first instructions from the
mDOC H1 Programmable Boot Block, which contains the IPL. Since in most cases this block
cannot hold the entire boot loader, the IPL contains minimum initialization code, after which the
Secondary Program Loader (SPL) is copied to RAM from flash. The remainder of the boot loader
code then runs from RAM.
The SPL is located in a separate (binary) partition on mDOC H1, and can be hardware protected if
required.
6.2.1
During platform initialization, certain CPUs wake up in 32-bit mode and issue instruction fetch
cycles continuously. An XScale CPU, for example, initiates a 16-bit read cycle, but after the first
word is read, it continues to hold CE# and OE# asserted while it increments the address and reads
additional data as a burst.
In Asynchronous Boot mode, the CPU can fetch its instruction cycles from the mDOC H1
Programmable Boot Block. After reading from this block and completing boot, mDOC H1 returns
to derive its internal clock signal from the CE#, OE#, and WE# inputs. Please refer to Section 8.3
for read timing specifications for Asynchronous Boot mode.
38
B
Introduction
Boot Replacement
Asynchronous Boot Mode
OOTING FROM M
DOC H1
Data Sheet, Rev. 1.1
mDOC H1 4Gb (512MByte) and 8Gb (1GByte)
95-DT-1104-01