MD2534-D2G-X-P SanDisk, MD2534-D2G-X-P Datasheet - Page 53

• Manufacturer Part Number: MD2534-D2G-X-P
• Description: IC MDOC H3 2GB FBGA
• Manufacturer: SanDisk

Specifications of MD2534-D2G-X-P

• Format - Memory: FLASH
• Memory Type: FLASH - Nand
• Memory Size: 2G (256M x 8)
• Interface: Parallel
• Voltage - Supply: 1.65 V ~ 1.95 V, 2.5 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 115-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Speed: -

Figure 10 illustrates an example of a boot sequence.
8.1.1
Host platforms should use Asynchronous Boot mode when using mDOC H3 as the system boot
device.
During platform initialization, certain CPUs wake up in 32-bit mode and issue instruction fetch
cycles continuously. An Intel PXAxxx 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.
Once in Asynchronous Boot mode, the CPU can fetch its instruction from the mDOC H3
Programmable Boot Block. After reading from this block and completing the boot, mDOC H3
returns to derive its internal clock signal from the CE#, OE#, and WE# inputs. Please refer to
Section 10 for read timing specifications for Asynchronous Boot mode.
8.1.2 Virtual RAM Boot
The Virtual RAM Boot feature utilizes the 32KB physical IPL SRAM to provide XIP access to
up the full XIP window size (either 8KB or 128KB) of flash data, without requiring any prior
knowledge of the device architecture. This feature can be used to support Secure Boot
requirements. The Virtual RAM Boot feature can only be used by platforms that support the
mDOC H3 BUSY# signal and variable-length I/O access, i.e. insert wait cycles if BUSY# signal
is active.
53
Asynchronous Boot Mode
Boot Loader
RAM
Basic System Initialization
B
OS Start-Up Code
oot Loader Copies
OS Image to RAM
OS Image
Power-Up
Figure 10: System Boot Sequence with mDOC H3
Data Sheet (Preliminary) Rev. 0.2
Copy
Image
to RAM
Take Image
from mDOC
Image Storage)
mDOC H3
(File Storage)
Partition (OS
Flash Disk
Flash Disk
Partition
mDOC H3 Embedded Flash Drive
92-DS-1205-10