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ignored
Word
Byte (CY)
Word (CY)
CRC-CCITT
CRC-XModem
sum by words to "word". CY flag is
ignored
sum by bytes to "word". CY flag is added
to result.
sum by words to "word". CY flag is added
to result.
sum by bytes to "word" using
RESULT=PREVIOUS + (x^16 + x^12 + x^5 +1)
sum by bytes to "word" using
RESULT=PREVIOUS + (x^16 + x^15 + x^2 +1)
Column marked as Neg. is a negation of checksum so, that
Sum + Neg. = FFFFH.
Column marked as Suppl. is complement of checksum so, that
Sum + Suppl. = 0 (+ carry).
Dialog checksum contains following items:
From address: This is a start address of block selected for
calculating checksums in buffer. Address is defined as Byte
address.
To address: This is an end address of block selected for
calculating checksums in buffer. Address is defined as Byte
address.
Insert checksum: This is special item used for select which
kind of checksum will be written into the buffer when, the
Calculate & insert was executed.
Insert address: This is special item that specifies an address
from the buffer where a result of chosen checksum will be
written, when the Calculate & insert was executed. Address
can not be specified inside the range <From address> to <To
address>. Address is defined as Byte address.
Size: This item is used for setting a size of chosen checksum
result, which will be written into the buffer. A size of checksum
result may be 8 (byte) or 16 (word) bits long. If word size was
selected, whole checksum value will be written into the buffer.
In other case will be written only low byte of checksum value.
Note: If word size was selected, a low byte of checksum value
will be written on address specified in box Insert address and a
high byte will be written on address incremented by one.
Calculate: Click on the button Calculate starts calculating
checksums for selected block in buffer. No writes into the
buffer are executed.
Calculate & insert: Click on the button Calculate & insert starts
calculating checksums for selected block in the buffer and
118
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