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L
/NWR is 0 when XINC
=
1 and DRXA [ 0 - 3] -
SRAX [ 0 - 3]
<
LXA [ 0 - 3]
/NWR is 0 when XINC
=
0 and DRXA[0-3] -
SRAX[0-3]
>
LXA[0-3]
/NWR is 1 in cases other than the above.
/PRD: Indicates that the number of words in the source rectangle (size when aligned
with a scale of 16 - pixel uni ts)
is greater than the number of words in the
destination rectangle.
/PRD is 0 when XINC
=
1 and DRXA[ 0 - 3]
<
SRAX[ 0 - 3]
/PRD is 0 when XINC
=
0 and DRXA[ 0 - 3] > SRAX[ 0 - 3]
/PRD is 1 in cases other than the above.
(The number of words are equal if /NWR and /PRD are both O.)
ROCC status is shown by /ROP, CP, WRITE, /FMK, /LMK and /PRED.
/ROP:
Requests an FB read/write.
CP:
1:
Copy and PCopy mode; 0: HWrite and HRead
WRITE: 1: Write to FB; 0: Read from FB
/FMK: Indicates the first word in one line of a rectangle. (indicates that a left
(right) mask is necessary to write to the FB, a right mask if XINC is 1 and a left
mask if XINC is O.)
/LMK:
Indicates the last word
in
one line of a rectangle. (indi - cates that a left
(right) mask is necessary to write to the FB, a right mask if XINC is 1 and a left
mask if XINC is 0.)
/PRED:
Indicates that the source rectangle X address pixel posi - tion is greater
(less) than the destination rectangle X address pixel position and that two initial
reads are necessary (when /PRD is 0).
ROCC states are described as follows:
/ROP:
0:
-
1:
w
/FMK:
0: f
1 :
-
/LMK:
0: l
1:
-
/PRED:
0: p
1 :
-
CP:
0:
-
1 : c
WRITE:
0:
rd
1 : wt
(Note: Not indicated as a state when writing the last line when
/NWR is O.)
For example, /ROP, CP, WRITE, /FMK, /LMK, and /PRED behave as follows:
(0,
1,
1,
1,
1,
1)
->
cwt,
(0,
0,
0,
0,
0,
0)
->
flprd
(1,
0,
1,
0,
1,
0)
->
Wf pwt
( 1,
0,
1,
1,
1,
1)
->
Wrd,
( 1,
1,
1,
1,
1,
1)
->
Wwt
ROCC status changes for one line only are
sho~m below~
States are shown as follows:
a)
FB->FB(COMOl:OO)
Normal (COM0123: 0000)
(x pn)
(Olx)
(OOx)
(111)
( 101)
( 110)
(100)
NWS-1510/1530/1580
(x : /XLAST,
p:
/PRO,
n: /NWR)
flcrd. fl cwt
flpcrd. flcrd. fl cwt
f c rd. f cwt. 1 c rd. 1 cwt
fpcrd. fcrd. fcwt. lcrd. I cwt
fcrd. fcwt. lncwt
fpcrd. fcrd. fcwt. lncwt
3-51
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