Dataman 448PRO2AP-AU User Manual page 72

Default address range is set according to buffer range of selected device.
Selecting option "Maintain last inserted values" causes that for the next time you open this
dialog, previously confirmed values will be reloaded as default.
The reserved key <Shift+Ctrl+F2> will bring out this menu from any menu and any time.
Buffer / Duplicate buffer content
This command performs duplicate buffer content in range of source EPROM to range of
destination EPROM. This procedure is suitable if there is used for example 27C512 EPROM to
27C256 EPROM position.
Note: The procedure always uses buffer start address 00000h.
Buffer / Checksum
Checksum of data stored in buffer of PG4UW is useful to verify that the buffer data are correct.
PG4UW contains following functions related to checksum:
 Tab Checksum calculator, this is on-demand checksum calculator that can calculate and
display various types of checksums of various data blocks in buffer. (*1)
 Tab Main checksum options contains options for Automatic checksum calculator with
Main checksum value displayed in main window of PG4UW in table Addresses and in Log
window of PG4UW (*2)
Checksum calculator contains on-demand checksum calculator.
 Fields From address and To address are used to enter address range for main checksum
calculation. Addresses are used only when checkbox Enabled is checked. Address is
always defined as Byte address.
 Group Exclude buffer block(s) from checksum calculation is useful for example for
serialization. Serialization usually modifies data at specified addresses in buffer. So there is
problem to check the checksum of buffer, when data on some addresses were changed by
serialization engine before each device programming. If part of buffer (data block) used for
serialization is excluded from checksum calculation, the checksum of buffer data will not be
changed by serialization data changes. One or more excluded blocks can be specified.
 Fields displaying values of calculated checksum types: see description of types at the
bottom.
 Column marked as STRAIGHT is result of checksum calculation without additional
adjustments.
 Column marked as NEGATED is a negation of checksum so, that SUM + NEG. = FFFFH.
 Column marked as SUPPLEMENT is complement of checksum so, that SUM + SUPPL. = 0
(+ carry).
 Insert checksum options box - this box contains following options for Calculate & insert
operation:
 Insert checksum
 Insert at address
Kind of checksum that is written into the buffer when, the Calculate &
insert operation was executed.
Address in buffer where a result of chosen checksum is written,
when the Calculate & insert was executed. Address can not be
specified inside the range <From address> to <To address>.
Address is always defined as Byte address.
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