Sample Sum-Check Calculation - Data I/O 298 Manual

Giossary (Continuedi
sum-check" A summation of bits calculated accoiding to
the rules of simple addition and usually expressed as a
four-digit hex number; any carry from the most significant
bit or digit is discarded. A sum-check is used to verify the
integrity of data transfers.
HEX DATA
84
C1
62
24
Sum-check in
hexadecimal notation
BINARY DATA
10000100
11000001
01100010
00100100
I
0000
oocn
11
oo
1011
I
t
Sixteen-bit binary
sum-check
Sample Sum-check Calculation
waveforms (programmable). The graphical representation
of the timing and magnitude of programming pulses. If the
programming waveforms are not kept within tolerance,
programming yield is jeopardized.
word limit.
Th~
highest address in a device. For example,
the word limit of a 1 Kx8 device is 1 K (or hex 3FF).
Synonymous with address limit.
word width. The number of bits in a byte or word (4 or 8).
D-3
10-990-0013