SH7216 Group

USB Function Module: USB Mass Storage Class

REJ06B0897-0100/Rev.1.00

July 2009

Page 13 of 32

4.5

Changing RAM Disk Settings

This section describes how to change the settings of the RAM disk used in this sample program.

4.5.1

Removable/Hard Disk

The RAM disk is used as a removable disk in this sample program.

The RAM disk can be used as a hard disk by commenting out "#define REMOVABLE_DISK" in "SetSystemSwitch.h"

and enabling comment "#undef REMOVABLE_DISK."

4.5.2

Changing the RAM Disk Capacity

This sample program uses 16-Mbyte capacity of the SDRAM as a RAM disk. To change the RAM disk capacity,

change the content of "SysMemMap.h." Specify the entire byte count *

DISK_ALL_BYTE. Then specify the start address and end address of the area to be used as a RAM disk by

RAM_DISK _S and RAM_ DISK _E *

Notes: 1. Specify a value of 1.5 Mbytes or more. The capacity viewed from the PC is slightly reduced because the

FAT information and other information use the capacity. This sample program configures the FAT

information with FAT12 (up to approx. 16 Mbytes) and FAT16 (up to approx. 2 Gbytes). Other FAT system

information need to be prepared by the user.

2. The area specified by RAM_ DISK _S and RAM_ DISK _E must be equal to or larger than the size

specified by DISK_ALL_BYTE.