CS9211-VNG National Semiconductor, CS9211-VNG Datasheet - Page 33

• Manufacturer Part Number: CS9211-VNG
• Manufacturer: National Semiconductor

Specifications of CS9211-VNG

• Operating Temperature (max): 85C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

Revision 2.1
Functional Description
3.2.8
The CS9211 contains hardware logic that performs Cycli-
cal Redundancy Checks (CRCs) on the panel data digital
pipeline, using the polynomial 1 + x
is used for error detection during silicon and design valida-
tion and makes it possible to capture a unique 24-bit signa-
ture for any given mode setup. An error in the dither/FRM
pixel pipeline will produce a different signature when com-
pared to a known good signature value. Various logic
blocks can be configured, as shown in Table 3-14. This
allows the programmer to quickly and accurately test data
processing without having to look for incorrect pixels on the
screen. In the FRM block test, each frame will produce a
different signature in a sequence, which repeats after 64
frames. The signature and the corresponding frame count
can be read from the register Offset 42Ch. Table 3-15
shows the bit formats for the register that controls this fea-
ture, and Figure 3-12 shows a simple block diagram.
Offset 42Ch-42Fh
31:8
7:2
Dither Enable for
Bit
TFT/DSTN/SSTN
Offset 40Ch[6:0]
1
0
101,XXX,X
000,001,1
001,010,1
010,011,1
011,100,1
100,101,1
CRC Signature
FRAME_CNT
SIG_DATA
SIG_EN
SGFR
Name
Bypass Dither for
TFT/DSTN/SSTN
Offset 40Ch[6:0]
Description
Signature Address (Read Only): 24-bit signature data for dither logic or FRM logic.
Frame Count: Represents the frame count, which is an index for the generated signature for that
frame.
Signature Free Run: The value of this bit during the first cycle of a frame determines whether a signa-
ture will be generated for that frame. If this bit is kept high, with signature enabled (bit 0 = 1), the signa-
ture generator captures data continuously across multiple frames. Changing this bit from high-to-low
causes the signature generation process to stop after the current frame.
0 = Do not capture signature during next frame.
1 = Capture signature during next frame.
Signature Enable: Enables/disables signature capture. 0 = Disable; 1 = Enable.
101,XXX,X
Table 3-14. Logic Functions Affecting the CRC
(Continued)
3
Table 3-15. Panel CRC Signature Register
+ x
4
+ x
Panel CRC Signature Register (R/W)
24
. This feature
Changes with the Frame
Note: Generates the sig-
42Ch[31:8]) for a given
frame count (Offset
FRM Enable for
Count (0 to 31)
nature (Offset
DSTN/SSTN
42Ch[7:2])
33
PANEL_DATA[23:0]
VSYNC/FLM
SHFCLK
(LD/UD)
FRM_RAM Contents =
Figure 3-12. CRC Data Path
FRM Bypass for
DSTN/SSTN
LFSR = 00
FRAME_CNTR
all 0’s
24
CRC
Reset Value = xxxxxxxxh
Offset 404h[30] = 1
24
5
Bypass CS9211
Offset 2Ch[31:8]
Offset 2Ch[7:2]
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Frame Count
Signature
Address
CRC