When Topix Compression Mode Is Selected; Length; L1 Parameter; L2 Parameter - Toshiba B-EV4 Series Manual

[When TOPIX compression mode is selected]

Graphic data

Length

L1
L2
L3
(1) Length: Total number of bytes of the graphic data (0001H ~ )
Ex. Length = 20 bytes:
(2) L1 parameter: Shows in which large block (512 dots/block) the changed data is contained.
L1
(3) L2 parameter: Shows in which medium block (64 dots/block) the changed data is contained
7
L2
(4) L3 parameter: Shows in which small block (8 dots/block) the changed data is contained (of
7
L3
* The graphic width for only the smaller value of either the designated value or the max. buffer
size (512 KB) is drawn. The minimum unit of the data drawing is 8 dots (1 byte). If the
graphic width is set to 3 dots, it will be reset to 8 dots (1 byte).
First line
7 6 5 4 3 2 1 0
512 dots 512 dots 512 dots
(of the L1 large block).
6 5 4 3 2 1 0
64 dots 64 dots 64 dots
the L2 medium block).
6 5 4 3 2 1 0
8 dots 8 dots 8 dots
Exclusive-OR is carried out between the current image data and the
image data one line previous. Only the changed bit is set to ON (1). The
alignment of dots is MSB (left dots) and LSB (right dots).
Range for length
L1
0 0 1 4
- 157 -
Second line
0: Not present
1: Present
0: Not present
1: Present
0: Not present
1: Present