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MRU User Manual V1.5
mrCRC
Calculates a 16-bit cyclic-redundancy check (CRC) value (by using the CRC-16
polynomial with a divisor of X16 + X15 + X2 + 1) starting at the address
“Source” and continuing for “NLocations.” The read address is incremented
by “DataSize” bytes for each appropriately-sized read cycle.
Visual BASIC Declaration:
Public Sub mrCRC(RetData As Integer, ByVal Group As Integer, ByVal DataSize As
Integer, ByVal Source As Long, ByVal NLocations As Long)
Call mrCRC(RetData,Group,DataSize,Source,NLocations)
Where: RetData
=
The return variable containing the CRC
calculation.
Group
=
0
to 15. The UUT’s group number.
DataSize
=
1
,2, or 4. Size of the read cycle to use.
Source
=
Valid UUT RAM address for the base address of
the source data.
NLocations
=
Valid number of UUT RAM locations for the given
data bus width.
EXAMPLES:
Const UUT_GROUP = 0
Const EACH_BYTE = 1
Dim ByteCRC As Integer
‘ Check 128 words (two bytes each) starting at 0x100:
Call mrCRC(ByteCRC,UUT_GROUP,EACH_BYTE,&H100&,256&)
‘ Show the results
MsgBox “ByteCRC = “ & CStr(ByteCRC)
Series 2040 Test System
Page 55