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Write mode from host to FB. - - HWri te
1 0
x x
1 1 0 1
- - - - 1 - - -
- - - - 0 - - -
- - - - - 1 - -
- - - - - 0 - -
Increment X address to the right (valid in Copy and PCopy modes).
Increment X address to the left (valid in Copy and PCopy modes).
Increment Y address to the right (valid in Copy and PCopy modes).
Increment Y address to the left (valid in Copy and PCopy modes).
- - 1 - - - - -
Send one to one from source to destination (valid in Copy, PCopy and
HWrite modes).
- - 0 - - - - -
Put 16 pixels from the source in one line at the destination (valid
in Copy, PCopy and HWrite modes).
- - - 1 - - - -
Do not change during rop mask execution (valid in Copy, PCopy and
HWrite modes).
- - - 0 - - - -
Change the rop mask in the destination word by word (valid in Copy,
PCopy and HWrite modes).
1 1 0 0 1 1 1 1
FB to host read mode. - - HRead
1 0 0 0 1 1 0 0
Pixel mode. - - DirRd/DirWt/DWrite
Destination address register ( X: DlO - DO, Y: Al2 - Al)
Sets the rop destination X, Y address. The destination address is one of the four
corners of the destination rectangle depending on the direction in which the X, Y
address set in rop mode reg. is incremented.
Source address register (
X:
DlO - DO,
Y:
Al2 - Al)
Sets the source destination X, Y address. The source address is one of the four
corners of the destination rectangle depending on the direction in which the
X,
Y
address set in rop mode reg. is incremented.
Limit address register (
X:
DlO - DO,
Y
count: Al2 - Al)
Sets the X address (opposite the destination X address in the case of a read) of the
right (left in the case of a read) edge of the destination (source in the case of a
read) rectangle and number of rop execution lines minus 1 (rectangle height minus 1
in the case of a read).
Exec. flag (Al4)
Requests FB read/write execution based on the set register value.
The following registers are transparent to the user, but exist in the hardware.
These mask registers are used to set the unchanging portion between two words
beginning or ending at any pixel on either side when writing those words. This is
due to the fact that the FB uses 16 -bit words. They are set simultaneously when the
destination X address is set as a rop command or when the limit X address is set.
Left mask register:
Mask for the one word at the left edge of the rectangle.
It is set to OxcOOO if the rectangle begins from the third pixel of the word.
Right mask register:
Mask for the one word at the right edge of the rectangle.
It is set to Oxlfff if the rectangle begins from the third pixel of the word.
3-46
NWS-1510/1530/1580
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