FF Systems FF-8070 Operation Manual - page 17
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APPENDIX B: FF-8070 Track Allocation
The track allocation command is used to more finely define the allocation of DVR memory.
The basic allocation command is executed at the factory and allocates the 100 system
tracks as 10 banks of 10 tracks each. In each bank, the first six tracks are 5.9 seconds long, while
the remaining four are 11.9 seconds long. With this allocation scheme, the only way to get access
to all 100 tracks is to add the FF-8070EXP expansion memory card. However, most applications
do not require this much memory, so all that is required is to reallocate some or all of the system
memory.
The first step is to determine how many tracks of different lengths are required. Use the
code to de-allocate all tracks starting with and following track number "nn" -- it is
usually advisable to start at track "00" and reallocate all tracks at once, but this is not required. The
code is used to allocate
desired tracks are allocated, or until the 100th track is allocated (at which point the DVR will no
longer accept allocation inputs and an "Abort" response is sent). The "Abort" response simply
means that all of the 100 system tracks have been allocated. The reallocation process should be
done before recording tracks because each reallocated track is erased in the process. The allocation
data is stored in nonvolitile memory which is specified to maintain data for up to 10 years. Thus,
if the DVR looses power, the tracks must be rerecorded, but the time allocations are retained.
APPENDIX C: Adding DRAM
Adding memory to the DVR is relatively simple. However, the process requires that all power be
removed from the DVR board -- this will necessitate that all tracks be rerecorded after the memory
is added. Memory is added in groups of four 1 Megabit DRAMS (411000, 511000, or equivalent)
as follows:
first group:
U1, U11, U21, & U31
second group: U2, U12, U22, & U32
:
:
:
:
last group:
U8, U18, U28, & U38
Any supplier of computer memory is likely to supply the DRAMS used on the FF-8070. The
access time is not critical (anything faster than 120ns is sufficient). FF-Systems can also provide
additional memory if another source is not available.
After the installation, the user must execute the DRAMS Installed and MAIL Tracks
commands to tell the DVR how much memory is installed and to reconfigure the mail box system.
MAIL Tracks must be executed even if there is no change to the number of voice mail tracks.
For systems that require more memory than the 10 minutes available on the FF-8070, a memory
expansion card is available that piggy-backs on to the FF-8070 (part# FF-8070EXP). This card
provides room for an additional 32 DRAMS or about 10 more minutes of record time. Contact FF-
Systems for more information.