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Table 19-1. Video RAM Array Loaded with NTSC Example
RAM
RAM WORD FIELD
ENTRY
Hx
Vx
Fx
Bx
0
00
00
11
00
1
11
00
11
00
2
11
00
11
00
3
11
00
11
00
4
00
00
00
00
5
11
00
00
00
6
11
00
00
00
7
11
00
00
00
8
00
00
00
00
9
11
00
00
00
10
11
00
00
11
11
11
00
00
11
12
11
00
00
00
13
00
00
00
00
14
11
00
00
00
15
11
00
00
00
16
11
00
00
00
17
00
00
11
00
18
11
00
11
00
19
11
00
11
00
20
11
00
11
00
21
00
00
11
00
22
11
00
11
00
23
11
00
11
11
24
11
00
11
11
25
11
00
11
00
26
00
00
11
00
27
11
00
11
00
28
11
00
11
00
29
11
00
11
00
NOTE: HX = HR:HF and VX = VR:VF.
MOTOROLA
VDS
INT
LCYC
LP
LST
01
0
3
1
0
Entry 0: LP=1—Beginning of loop.
01
0
243
0
0
Entry 1: CNT=243—Hold this entry for 243 video
01
0
1440
0
0
Entry 2: CNT=1440—Hold this entry for 1440 video
01
0
32
1
0
Entry 3: LP=1—End of loop.
01
0
18
1
0
01
0
243
0
0
Lines 4-21, FIELD = 0, BLANK is asserted
(vertical blanking)
01
0
1440
0
0
01
0
32
1
0
01
0
240
1
0
01
0
235
0
0
Lines 22-261. ODD field active area, the horizontal
01
0
8
0
0
line is repeated 240 times
00
0
1440
0
0
01
0
32
1
0
01
0
4
1
0
01
0
243
0
0
Lines 262-265, FIELD = 0, BLANK asserted
(vertical; blanking)
01
0
1440
0
0
01
0
32
1
0
01
0
19
1
0
01
0
243
0
0
Lines 266-284, FIELD = 1, BLANK asserted
(vertical; blanking)
01
0
1440
0
0
01
0
32
1
0
01
0
240
1
0
01
0
235
0
0
Lines 285-524. EVEN Field active area
01
0
8
0
0
00
0
1440
0
0
01
0
32
1
0
01
0
1
1
0
01
0
243
0
0
Line 525, FIELD = 1, BLANK is asserted
(vertical blanking)
01
0
1440
0
0
01
1
32
1
1
MPC823e REFERENCE MANUAL
Video Controller
LINE DESCRIPTION
LCYC=3—Loop entries 0-3 three times.
CNT=1—Hold this entry for one video clock.
clocks.
clocks.
CNT=32—Hold this entry for 32 video clocks.
19-23
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