866 B&K Precision, 866 Datasheet - Page 112

• Manufacturer Part Number: 866
• Description: PROGRAMMER UNIV W/ USB INTERFACE
• Manufacturer: B&K Precision
• Type: Universalr

Specifications of 866

• Contents: Programmer, Adapter, Cable, Manual and Software
• For Use With/related Products: EPROM, EEPROM-Flash, Serial EPROM, Microcontroller & PLD
• Other names: 866BK; Q2005647

Buffer / Checksum
The checksum dialog is used for calculate checksums of
selected block in buffer. The checksums are calculated by next
way :
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 at 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>, from which will be checksum
calculate. 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.
Byte
Word
Byte (CY)
Word (CY)
CRC-CCITT
CRC-XModem
sum by bytes to "word". CY flag is
ignored
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)
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