User manual

ELNEC s. r. o.
Swap bytes operation from Start address 0 to End address N modifies data in buffer by
following tables:
Address Original
Data
Swap 2-bytes
inside 16-bit words
Swap 4-bytes
inside 32-bit words
Swap nibbles
inside bytes
0000h b0 b1 b3 b0m
0001h b1 b0 b2 b1m
0002h b2 b3 b1 b2m
0003h b3 b2 b0 b3m
0004h b4 b5 b7 b4m
0005h b5 b4 b6 b5m
0006h b6 b7 b5 b6m
0007h b7 b6 b4 b7m
b0, b1, b2, ... means original buffer byte values from addresses 0, 1, 2, ...
b0m, b1m, b2m, ... means nibble-swapped original bytes b0, b1, b2, ... by following rules:
Original Byte bits bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
Nibble-swapped Byte Bits bit 3 bit 2 bit 1 bit 0 bit 7 bit 6 bit 5 bit 4
Buffer / Erase
If this command is selected, the content of the buffer will be filled with topical blank character.
The reserved key <Ctrl+F2> will bring out this menu from any menu and any time.
Buffer / Fill random data
If this command is selected, the content of the buffer will be filled with random data.
The reserved key <Shift+Ctrl+F2> will bring out this menu from any menu and any time.
Buffer / Duplicate buffer
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 check the data are correct.
Pg4uw contains following functions according to checksum:
• Automatic checksum calculator with Main checksum value displayed in main window
of Pg4uw in table Addresses and in Log window of Pg4uw
• On-demand checksum calculator that can calculate and display various types of
checksums of various data blocks in buffer.
Settings for Automatic checksum calculator and on-demand checksum calculator are
available in dialog Checksum.
Dialog Checksum contains two tabs (panels):
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