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参数资料
| 型号： | IBM37RGB524CF17A |
| 元件分类： | 显示控制器 |
| 英文描述： | 1600 X 1280 PIXELS PALETTE-DAC DSPL CTLR, PQFP144 |
| 封装： | QFP-144 |
| 文件页数： | 20/72页 |
| 文件大小： | 509K |
| 代理商： | IBM37RGB524CF17A |
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March 17, 1995
21
IBM
RGB524
5.7.3
Other
Changes to the Cursor Color registers and the Cursor X
and Y Hot Spot registers are propagated to the cursor
logic as soon as they are made, so if they are updated
while the cursor is being displayed the cursor image will
be disturbed.
Changes to the cursor array are also propagated to the
cursor logic as soon as they are made. Also, as noted
above, microprocessor read accesses of the cursor array
may interfere with the cursor display logic. For example,
with a 32 x 32 cursor being displayed from slot 0, micro-
processor read accesses to slot 1 may cause the display
of the slot 0 cursor to be disturbed.
It is recommended that Cursor Array Reads and
changes to the Cursor Color registers and the Cursor X
and Y Hot Spot registers be made only when the cursor
is disabled, off screen, or during vertical blanking time.
6.0
DAC Control
Several miscellaneous features of the DACs are con-
trolled by the DAC Operation register.
6.1
SOG - Composite Sync-On-Green
When the SOG bit is set, the signal on the HCSYNCIN
input will be merged with the pixel data on the green
DAC. The incoming signal may be inverted and/or
delayed before presentation at the DAC.
6.2
BRB - Blank Red and Blue DACs
When this is set the red and blue DACs are set to the
blanking level. This is intended for use when a mono-
chrome display is driven by the green DAC.
6.3
DSR - DAC Slew Rate
This bit affects the rise and fall times of the DAC analog
outputs (slew rate). The default value (off) uses a “slow”
rate, typically 14 ns. When the bit is set to “on”, the slew
rate will be “fast”, typically 2 ns. The rise and fall times
are measured using the 10% point and 90% point.
The faster slew rate will yield the sharpest pixels if the
monitor can support that rate. For some monitors it may
be desirable to set the DACs to the slower slew rate.
6.4
DPE - DAC Blanking Pedestal
Enable
When off, the DAC pedestal is disabled (blanking level =
0 IRE). When on, the pedestal is enabled (7.5 IRE).
Table 8. Cursor Modes
CURSOR
PIXELS
CURSOR MODE
Mode 0
CURSOR
MODE = 01
Mode 1
CURSOR
MODE = 10
Mode 2
CURSOR
MODE = 11
00
Transparent
Cursor Color 1
Transparent
01
Cursor Color 1
Cursor Color 2
Transparent
10
Cursor Color 2
Transparent
Cursor Color 1
11
Cursor Color 3
Complement
Cursor Color 2
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相关代理商/技术参数 |
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