Elnec MEMprog2 User Manual page 102

Swap bytes operation from Start address 0 to End address N modifies data in buffer by
following tables:
Address Original
Data
0000h b0
0001h b1
0002h b2
0003h b3
0004h b4
0005h b5
0006h b6
0007h b7
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
Nibble-swapped Byte Bits
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):
Swap 2-bytes
inside 16-bit words
b1
b0
b3
b2
b5
b4
b7
b6
bit 7 bit 6 bit 5
bit 3 bit 2 bit 1
102
Swap 4-bytes
inside 32-bit words
b3
b2
b1
b0
b7
b6
b5
b4
bit 4 bit 3
bit 0 bit 7
ELNEC s. r. o.
Swap nibbles
inside bytes
b0m
b1m
b2m
b3m
b4m
b5m
b6m
b7m
bit 2 bit 1 bit 0
bit 6 bit 5 bit 4