GMS30C7201 Datasheet, PDF (149/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

LCD & VGA Controllers
11.13 VGA Test Register
The VGA test register contains bits that allow certain VGA signals to be output on the LCD pins
for test purposes. This register should not normally be used. The register is reset to all zero, and
this will result in normal operation.
Bit
0
2-1
3
4
5
6
7
8
9
10
11
31-12
Name
-
THDO
TVDATA
TLDATA
TDAC
TRF
TCF
TLR
TCR
TLC
TCC
-
Description
Reserved
Test VGA data output
00 - LCD data bus outputs normal LCD data
01 - Undefined
10 - LCD data bus outputs LOW nibble of VGA RGB data
11 - LCD data bus outputs HIGH nibble of VGA RGB data
Walking one’s pattern used in place of SDRAM data for the VGA
controller
Walking one’s pattern used in place of SDRAM data for the LCD
controller
0 - normal VGA DAC operation
1- test VGA DAC operation: DAC Clock and power down from pins,
DAC data input from LCD data bus pins
For production test of grayscaler, never write a “1” to these registers in
normal use.
For production test of grayscaler, never write a “1” to these registers in
normal use.
For production test of grayscaler, never write a “1” to these registers in
normal use.
For production test of grayscaler, never write a “1” to these registers in
normal use.
For production test of grayscaler, never write a “1” to these registers in
normal use.
For production test of grayscaler, never write a “1” to these registers in
normal use.
Reserved
Table 11-14: VGA Test Register
GMS30C7201 Data Sheet
11-21