7.3
Application Flash EPROM
The board is fitted with between 16 and 64 Mbytes of Intel StrataFlash EPROM which is free for
use by application software. The memory is connected to the CSB5 X-Bus interface and is
accessible in protected mode via a paged 512 Kbyte window (refer to Figure 7-1). This window is
shared with the battery backed SRAM. Memory allocated to the window is selected via a
combination of device and page within that device. Two dedicated I/O registers provide these
functions. The page memory and type are selected via the Memory Page and Status register.
The specific device is selected via Status & Control Register 4. The device selection gives
access to each of up to four 16 Mbyte devices, thus the first 16 Mbyte is device 0, and so forth.
The Application Flash EPROM may be write-protected using a jumper, shown in Figure 7-2.
Write and erase cycles are permitted only when the jumper is in the Enabled position.
If required, the Application Flash Memory can be programmed with a disk image and configured
via BIOS Setup screens to operate as a ROM disk, replacing either Drive A: or B:. Refer to
Section 4.3 for further details.
7-4
VP 110/01x
Memory
LK2 Flash Program
Enabled
Disabled
Figure 7-2 Flash Program Jumper
Содержание VP 110/01 Series
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