Epson S1C33L26 Technical Manual page 503

CALC_ERR[3:0]
0xf to 0x9 Reserved
0x8 Decompress
0x7 Picture header
0x6 Font size
0x5 Radius
0x4 Circle location
0x3 Concave
0x2 Coordinates
0x1 Trace width
0x0 No error
*1 A calculation error and a drawing error (No VRAM write error) have occurred at the same time under the con-
ditions shown below.
a. When a Concave error (CALC_ERR[3:0] = 0x3) has occurred while calculation error interrupts are en-
abled (GE_ERR_IE1/GE_IE register = 1)
b. When a Decompress error (CALC_ERR[3:0] = 0x8) has occurred and the data placed at the front of the
invalid decompress flag (0x80) has not been written to the VRAM (drawing on outside the work area/clip
area or drawing with the transparent color)
No drawing error will occur when another calculation error has occurred.
*2 Concave errors can be detected only when calculation error interrupts are enabled (GE_ERR_IE1 = 1). Other
calculation errors can always be detected regardless of the GE_ERR_IE1 setting.
*3 The image data in which an error occurs will be drawn with the last valid color.
Note: Occurrence of a calculation error does not terminate command execution if calculation error inter-
rupts are disabled (GE_ERR_IE1 = 0). Although the command in which an error has occurred is
not executed, the subsequent commands are executed normally. In this case, CALC_ERR[3:0] is
not cleared. Be sure to clear CALC_ERR[3:0] before executing the subsequent command list.
When calculation error interrupts are enabled (GE_ERR_IE1 = 1), occurrence of an error termi-
nates command execution. In this case, no end-of-execution interrupt will occur.
Drawing errors
If an error is detected while the GE is writing data to the VRAM, the GE sets the corresponding error bit in
DRAW_ERR[3:0]/GE_IF2 register. A drawing error interrupt can be generated at this point. Read DRAW_
ERR[3:0] in the interrupt handler routine to identify the error that occur. The DRAW_ERR[3:0] bits that have
been set are cleared by writing 1.
DRAW_ERR[3:0]
0b1000 No VRAM write
0b0100 Color depth over
S1C33L26 TECHNICAL MANUAL
Table 27. 4.5.1 List of Calculation Errors
–
A Decompress flag (0x80) exists in the image data specified by a decom-
*3
pression command.
The header of the image data specified by a decompression command is
invalid.
The character width or height specified by a character command is 0.
The radius specified by a circle/solid filled circle command is invalid (or
less than 1).
No arc/circular section to be drawn is specified in a circle/solid filled circle
command.
An illegal quadrilateral (concave) is specified in a solid filled quadrilateral
*1 *2
command.
The area specified as the copy source in a copy command or clipping area
in a register configuration command is beyond the work area.
An illegal line width (less than 1 or a value that exceeds the object size) is
specified in a object (line) drawing command.
No error has occurred.
Table 27. 4.5.2 List of Drawing Errors
Data has not been written to the VRAM. The following shows leading
causes:
1. All the lines of the specified object are located out of the drawing area
(except when a block transfer command or a drawing command with re-
write effect is out of the range).
2. The object/image has only the transparent color (except when a copy
command or a block transfer command is executed, or the writing effect
of rewrite or mesh specifies the transparent color).
3. A Concave error (CALC_ERR[3:0] = 0x3)* has occurred when calcula-
tion error interrupts are enabled (GE_ERR_IE1 = 1).
The specified drawing color or a pixel color in the image data is out of the
effective range for the bpp mode set in the GE.
Seiko Epson Corporation
27 GRAPHICS ENGINE (GE)
Error
Error
27-23