LM2506SQX/NOPB National Semiconductor, LM2506SQX/NOPB Datasheet - Page 9

• Manufacturer Part Number: LM2506SQX/NOPB
• Description: IC SER/DESER 18BIT MPL 40-LLP
• Manufacturer: National Semiconductor
• Series: LMr

Specifications of LM2506SQX/NOPB

• Function: Serializer/Deserializer
• Data Rate: 320Mbps
• Input Type: LVCMOS
• Output Type: LVCMOS
• Number Of Inputs: 22
• Number Of Outputs: 3
• Voltage - Supply: 1.74 V ~ 3 V
• Operating Temperature: -30°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM2506SQX

Functional Description
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.
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
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
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
1
Format
3
1
⁄
QVGA
2
⁄
⁄
4
2
SVGA
VGA
VGA
Pixels
Hor.
800
640
320
320
Pixels
Ver.
300
320
480
240
FIGURE 9. 18-bit RGB Display Mode Transaction
(Continued)
Depth
Color
FIGURE 10. PE Output Timing
18
16
18
18
Frames
fps
50
55
55
55
9
PCLK Rate = Net Bandwidth / 24
The PCLK rate is equal to the net bandwidth divided by the
total number of bits.
the RGB are not used and data is offset toward the upper
(MSB) end of the bit fields. Unused inputs should be tied off.
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.
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
Mbps
Pixel
BW
216
180
152
76
Blanking
Percent
10
10
10
20
20125550
201255024
Mbps
Net
BW
316
265
223
122
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PCLK
MHz
13.2
rate
9.3
5.1
11