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LM2506GR Datenblatt(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM2506GR
Bauteilbeschribung  Low Power Mobile Pixel Link (MPL) Level 0, 18-bit RGB Display Interface Serializer and Deserializer
Download  19 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2506GR Datenblatt(HTML) 9 Page - National Semiconductor (TI)

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Functional Description (Continued)
Pixel bandwidth is equal to display resolution times color
depth times frame rate.
Net Bandwidth = (Pixel BW)(24/18)(1.0 + % Blanking)
Net bandwidth is equal to the pixel bandwidth times the
overhead times the blanking overhead.
PCLK Rate = Net Bandwidth / 24
The PCLK rate is equal to the net bandwidth divided by the
total number of bits.
Format
Hor.
Pixels
Ver.
Pixels
Color
Depth
Frames
fps
Pixel
BW
Mbps
Percent
Blanking
Net
BW
Mbps
PCLK
rate
MHz
1
2SVGA
800
300
18
50
216
10
316
13.2
3
4VGA
640
320
16
55
180
10
265
11
1
2VGA
320
480
18
55
152
10
223
9.3
QVGA
320
240
18
55
76
20
122
5.1
Other RGB Color Depths
When transporting color depth below 18-bit, the 18-bit pro-
tocol can be used by offsetting the color data. The LSBs of
the RGB are not used and data is offset toward the upper
(MSB) end of the bit fields. Unused inputs should be tied off.
Parity Error Output
Parity Status is output as a pulse on the Parity Error (PE)
output pin (DES) whenever there is a parity error. These
pulses could be counted or used by various diagnostic
equipment. PE is a high going pulse that is 3 MC cycles long
for each frame containing an error. The PCLK output can be
used to sample the PE bit. SET time is nominally 2 MC
cycles and a HOLD time of 1 MC cycle. The serial PE bit is
Odd Parity and is based on the RGB, and Control (VS, HS,
DE) bits only. See Figure 10.
SYNCHRONIZATION DETECT AND RECOVERY
If a data error or clock slip error occurs over the MPL link, the
LM2506 can detect this condition and recover from it. The
method chosen is a data transparent method, and has very
little overhead because it does not use a data expansion
coding method. For the 18-bit color transaction (or frame), it
201255024
FIGURE 9. 18-bit RGB Display Mode Transaction
20125550
FIGURE 10. PE Output Timing
www.national.com
9


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