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2-Series Card Cage System Crestron RACK2
On-Board Memory
The CPU2 has 36MB of built-in memory (non-volatile and volatile). A total of
36MB is broken down as follows: 4MB flash (non-volatile), 32MB DRAM
(volatile), and 256KB NVRAM (non-volatile memory). Flash memory contains the
file system inside the 2-series control engine. NVRAM contains information that is
retained after loss of electrical power. Volatile memory is lost after a power failure.
Refer to the lists below for a breakdown of memory usage for program-related
information stored in the unit.
Internal Flash
The 4MB flash memory consists of approximately 1.5MB used for firmware, and
approximately 2.5MB available for SIMPL, SIMPL+, and web pages. The files that
reside in flash conform to a flat directory structure. The following table presents the
structure of the overall file system.
File System Structure
TOP LEVEL SECONDARY LEVEL DESCRIPTION
\ Root of the file system
DISPLAY Legacy/Unused
SYS Contain various system configuration
files
SETUP Directory used to hold setup files
HTML Web pages
SIMPL Control system program files
SPLUS SIMPL+ module files\
USER User defined files
MAILBOX User mailbox file
CFØ The mounting point for the compact flash
files.
\CFØ\DISPLAY Directory used to hold display files
\nvram The mounting point for NVRAM disk files
Although the file system is case insensitive, the case is preserved to maintain file
checksums. The compact flash directory only appears when the compact flash is
inserted into the system. To reference files on the compact flash, prefix the “\CFØ\”
to any fully qualified path from the Windows environment. For example, if the file in
Windows is “\MyDirectory\MySubdirectory\MyFile.ext”, the complete 2-Series path
for a file on the first Compact Flash slot (onboard) is:
“\CFØ\MyDirectory\MySubdirectory\MyFile.ext”
You do not have to create subdirectories for general files; you can put them in the
root of the Compact flash (\CFØ).
The only time subdirectories are required is when putting bootable projects on the
Compact Flash (\CF0\SIMPL, \CF0\SPLUS), but SIMPL Windows takes care of that
for you when you do the File | Copy to CF function. SIMPL Windows makes the
appropriate subdirectories. The same is true when you put web pages on the
Compact Flash. The tools create the appropriate directories.
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2-Series Card Cage System: RACK2 Operations Guide – DOC. 5958