Capacity Of Backup Memory (Pc-Card) - Baer DLX User Manual

3.8.5

Capacity of backup memory (PC-Card)

Due to technological and administrational reasons the whole memory of a
PC-Card is divided into sectors. Data is always written or erased by com-
plete sectors.
Depending on the card type the following sector sizes are available:
•
SRAM cards:
•
FLASH cards:
The memory is divided into the following areas:
Memory area
Administration information:
Spontaneous events:
Reset buffer:
(cumulative counters,
without rates)
Registration period Tm1:
Registration period Tm2:
Intermediate buffer:
The number of stored entries per memory area varies depending on the
level of usage in individual sectors.
DLXPARA can determine the required memory capacity of a PC-Card and
this information can retrieved from the unit via SCTM protocol (see appen-
dix A: table addresses 700-80 and 700-81).
Checksums are created for each block of data to protect against corruption.
The checksum is the arithmetic sum total of a block of data and it uses one
byte of memory. The amounts carried over from the summation are dis-
carded.
Each block of data can vary in length. For buffers one block of data is
equivalent to one buffer entry. Administration information is also divided
into blocks of data.
36
256Byte
128kByte (:=131072Byte)
Number of bytes (Sectors)
Number of bytes (Sectors)
Number bytes per event
Number of events
Number of bytes (Sectors)
Number of bytes per reset
Number of resets
Number of days
Number of days
Number of Bytes (Sectors)
SRAM
768 (3) 131072 (1)
1536 (6) 262144 (2)
11
114 to 139 11914 to 23831
9472 (37) 262144 (2)
1538
4 to 6
Programmed via DLXPARA
Programmed via DLXPARA
0 131072 (1)
FLASH
11
1538
83 to 170