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
The checksum dialog is used for calculate checksums of selected block in buffer. The
checksums are calculated by next way :
Byte
sum by bytes to "word". CY flag is ignored
Word
sum by words to "word". CY flag is ignored
Byte (CY)
sum by bytes to "word". CY flag is added to result.
Word (CY)
sum by words to "word". CY flag is added to result.
CRC-CCITT
sum by bytes to "word" using RESULT=PR (x^16 + x^12 + x^5 +1)
CRC-XModem
sum by bytes to "word" using RESULT=PR (x^16 + x^15 + x^2 +1)
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).
79
Summary of Contents for 844USB
Page 7: ...Introduction 7 ...
Page 12: ...Quick Start 12 ...
Page 15: ...Detailed description 15 ...
Page 16: ...859 16 ...
Page 28: ...866B 28 ...
Page 41: ...844USB 41 ...
Page 50: ...848A 50 ...
Page 56: ...Setup 56 ...
Page 67: ...Pg4uw 67 ...
Page 117: ...Pg4uwMC 117 ...
Page 127: ...Common notes 127 ...
Page 134: ...Troubleshooting and warranty 134 ...