SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 332
SC2200
Manufacturer Part Number
SC2200
Description
Thin Client On a Chip
Manufacturer
NSC [National Semiconductor]
Datasheet
1.SC2200.pdf
(433 pages)
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Video Processor Module
6.2.6
The TFT interface can be programmed to one of two sets of
balls: IDE balls or Parallel Port balls. PMR[23] of the Gen-
eral Configuration registers program where the TFT inter-
face exists (see Table 3-2 on page 81).
Note:
Support for a TFT panel requires power sequencing and an
18-bit (6-bit RGB), digital output. The relevant digital output
signals are available from the SC2200.
TFT output signals are:
• TFTD[5:0] for blue signals
• TFTD[11:6] for green signals
• TFTD[17:12] for red signals
• HSYNC and VSYNC - sync signals
FP_PWR_EN
FP_VDD_ON
HSYNC, VSYNC,
TFTDE, TFTDCK
TFT Interface
If the TFT interface is on the IDE balls, the maxi-
mum FPCLK supported is 40 MHz. If the TFT inter-
face is on the Parallel Port balls the maximum
FPCLK supported is 80 MHz.
TFTD[17:0],
bit
T
0
T
1
(Continued)
Figure 6-14. TFT Power Sequence
332
• TFTDCK - data clock signal.
• TFTDE - data enable signal.
• FP_VDD_ON - power control signal
Power Sequence
Power sequence is used to control assertion of
FP_VDD_ON and TFTD signals.
All bits related to power sequence configuration are located
in the Display Configuration register (F4BAR0+Memory
Offset 04h).
After enabling CRT_EN (bit 0), and FP_PWR_EN (bit 6),
the state machine waits until the next VSYNC to switch on
the FP_VDD_ON signal. The state machine then asserts
the TFTD[17:0] signals after the delay programmed via
PWR_SEQ_DLY (bits [19:17]) When FP_PWR_EN (bit 6)
is set to 0, the reverse sequence happens for powering
down the TFT.
T
T
0
1
is time to next VSYNC
is a programmable multiple of frame time
T
0
+T
1
T
1
Revision 3.0
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