MODEL NO : LTN156AT14-F01. The information described in this SPEC is preliminary and can be changed without prior notice. S.K Lee

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Surface type [ Glare ] The information described in this SPEC is preliminary and can be

1 TO DATE July 6. 2 SAMSUNG SAMSUNG TFTLCD TFTLCD MODEL NO LTN56AT4F NOTE Extension code [ F ] LTN56AT4F Surface type [ Glare ] The information described in this SPEC is preliminary and can be changed without prior notice. APPROVED BY S.K Lee PREPARED BY LCD Application Engineering Part2, TCS Team SAMSUNG ELECTRONICS CO., LTD. Doc.No. LTN56AT4F Rev.No 4AS76 Page / 32

2 CONTENTS Revision History General Description. Absolute Maximum Ratings. Absolute Ratings of environment.2 Electrical Absolute Ratings 2. Optical Characteristics 3. Electrical Characteristics 3. TFT LCD Module 3.2 Backlight Unit 3.3 LED Driver 4. Block Diagram 4. TFT LCD Module 5. Input Terminal Pin Assignment ( 4 ) 5. Input Signal & Power 5.2 LVDS Interface 5.3 Timing Diagrams of LVDS For Transmitting 5.4 Input Signals, Basic Display Colors and Gray Scale of Each Color. 5.5 Pixel format 6. Interface Timing 6. Timing Parameters 6.2 Timing Diagrams of interface Signal 6.3 Power ON/OFF Sequence 7. Outline Dimension 8. Packing 9. Markings & Others. General Precautions. EDID ( 3 ) ( 4 ) ( 5 ) ( 7 ) ( ) ( 3 ) ( 9 ) ( 2 ) ( 24 ) ( 26) ( 28 ) ( 3 ) Doc.No. LTN56AT4F Rev.No 4AS76 Page 2 / 32

3 REVISION REVISION HISTORY HISTORY Date Apr Apr May 2. 2 July, 6. 2 Revision No. P P P2 A Page All p.3 p.32 p. 6 p. p. 2 All p. 6 p. 7 p. 9 p. p. 2 p. 4 p. 5 p.22~23 p.26~27 p.3~32.the preliminary specification of LTN56AT4F was issued first..the EDID was updated..the Max. voltage of logic input was changed from +2.45V to +.3..The Min. & Max. value of Main frequency were updated..the Min. of PWM frequency was updated as.khz..the approval specification of LTN56AT4F was updated..the absolute rating of VLED was updated as Fujitsu s request..typ. and Min. value of viewing angle was updated..fdclx was changed from 72.33MHz to 75.55MHz..SEC changed definition of 3points positions as HD resolution..sec updated Power based on real value..fdclx was changed from 72.33MHz to 75.55MHz..LED driver was changed from Richtek(RT856) to Intersil (ISL9767) as Fujitsu s request..due to changing LED driver, Max. of PWM low level, Min. of PWM high level and Max. of LED enable were changed..the name of LVDS connector was changed from IPEX E2 to IPEX 24554E2R..LED enable off range was changed from ~.V to ~.8V..The name of LVDS connector was changed from IPEX E2S to IPEX 24554E2R..Outline dimension was updated..fujitsu s CP No was updated. [CP A] Summary.EDID was changed as correcting Gx. (.335 to.33) [Checksum 68] [Checksum 6D] Doc.No. LTN56AT4F Rev.No 4AS76 Page 3 / 32

4 GENERAL DESCRIPTION DESCRIPTION LTN56AT4 is a color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) that uses amorphous silicon TFT as switching devices. This model is composed of a TFT LCD panel, a driver circuit and a backlight system. The resolution of a 5.6" contains 366 x 768 pixels and can display up to 262,44 colors. 6 O'clock direction is the Optimum viewing angle. FEATURES Thin and light weight High contrast ratio, high aperture structure 366 x 768 pixels resolution (69) Fast Response Time Low power consumption LED BLU Structure DE (Data enable) only mode 3.3V LVDS Interface On board EDID chip Pbfree product RoHS comply product APPLICATIONS Notebook PC If the usage of this product is not for PC application, but for others, please contact SEC GENERAL INFORMATION Pixel pitch Item Display area Driver element Display colors Number of pixel Pixel arrangement asi TFT active matrix 262, x 768 RGB vertical stripe Specification (H) x (V) (5.6 diagonal).252 (H) x.252 (V) (TYP.) Display Mode Normally white Surface treatment Haze, Hardness 3H (Reflection ratio 4~5%) Glare Unit mm pixel mm Note 6 9 Doc.No. LTN56AT4F Rev.No 4AS76 Page 4 / 32

5 Mechanical Information Module Size Item Note () Measurement condition of outline dimension. Equipment Vernier Calipers. Push Force 75g f (minimum). ABSOLUTE MAXIMUM RATINGS. ENVIRONMENTAL ABSOLUTE RATINGS Horizontal (H) Vertical (V) Weight Depth (D) Item Storage temperate Operating temperate (Temperature of glass surface) Shock ( nonoperating ) Vibration (nonoperating) Altitude ( operation ) Altitude ( storage ) Min Symbol T STG T OPR Snop Vnop Typ Relative Humidity ( %RH) Operating Range Storage Range Temperature ( O C) (4),(5) Doc.No. LTN56AT4F Rev.No 4AS76 Page 5 / 32 Min. 2 Max Max , 4, Note () Temperature and relative humidity range are shown in the figure below. 95 % RH Max. ( 4 O C > Ta) Maximum wet bulb temperature at 39 O C or less. (Ta 4 O C) No condensation. (2) 2ms, half sine wave, one time for ±X,±Y,±Z. (3) ms, Trapezoidal wave, one time for ±X,±Y,±Z. (4) 5~5 Hz, Random vibration, 3 min for X,Y,Z. (5) At testing Vibration and Shock, the fixture in holding the Module to be tested have to be hard and rigid enough so that the Module would not be twisted or bent by the fixture Unit mm mm mm g Unit C C G G feet feet Note () Note () () (2),(5) (3),(5)

6 .2 ELECTRICAL ABSOLUTE RATINGS () TFT LCD MODULE Item Power Supply Voltage Logic Input Voltage Absolute rating of VLED Note () Within Ta (25 ± 2 C ) Symbol VDD VDD VLED Min. VDD.3 VDD VDD +.3 VDD VDD =3.3V, VSS = GND = V Max. Unit V V V Note () () () Doc.No. LTN56AT4F Rev.No 4AS76 Page 6 / 32

7 2. OPTICAL CHARACTERISTICS The following items are measured under stable conditions. The optical characteristics should be measured in a dark room or equivalent state with the methods shown in Note (5). Measuring equipment TOPCON SR3 Average Luminance of White * Ta = 25 ± 2 C, VDD=3.3V, fv= 6Hz, fdclk = MHz, PWM duty = % center Contrast Ratio CR 4 5 point Viewing Angle Item Response Time at Ta ( Rising + Falling ) Color Chromaticity ( CIE 93 ) Color Gamut 3 Points White Variation Red Green Blue White Hor. Ver. Symbol TR + TF YL,AVE RX RY GX GY BX BY WX WY θl θr φh φl δl Condition center point Normal Viewing Angle φ = θ = CR Min Typ. 6 (6+) Max Unit msec cd/m 2 Degrees % Note (), (2), (5) (), (3) PWM duty = % (4) (), (5) SR3 (), (5) (6) Doc.No. LTN56AT4F Rev.No 4AS76 Page 7 / 32

8 Note ) Definition of Viewing Angle Viewing angle range( C/R) θ L =9 o 6 O clock direction φ L = 9 o Note 3) Definition of Response time Display data Optical Response y' x % 9% % % θ L White(TFT OFF) φ L Normal Line φ = o, θ = o Note 4) Definition of Average Luminance of White measure the luminance of white at center point. φ H θ R Black(TFT ON) y x' 2 O clock direction φ H = 9 o θ R =9 o Note 2) Definition of Contrast Ratio (CR) Ratio of gray max (Gmax),gray min (Gmin) at center point CR = CR (7) Points 7 at the figure of Note (6). TR White(TFT OFF). Center point of White ( YL,AVE ) YCENTER = YL7 TF (342) ( 683) (24) 7 Time VIEW AREA (92) (384) (576) (lines) test point Doc.No. LTN56AT4F Rev.No 4AS76 Page 8 / 32

9 Photodetector (TOPCON SR3) TFTLCD module Center of the screen LCD panel [ Optical characteristics measurement setup ] Note 5) After stabilizing and leavblg the panel alone at a given temperature for 3 min, the measurement should be executed. Measurement should be executed in a stable, windless,and dark room. 3 min after lighting the backlight. This should be measured in the center of screen. LED current 24. ma Environment condition Ta = 25 ± 2 C Field = 2 5cm Note 6) Definition of 3 points white variation (δ L ), [ ~ 3 ] mm mm δ L = mm Maximum luminance of 3 points Minimum luminance of 3 points mm (lines) test point Doc.No. LTN56AT4F Rev.No 4AS76 Page 9 / 32

10 3. ELECTRICAL CHARACTERISTICS 3. TFT LCD MODULE Item Voltage of Power Supply Differential Input Voltage for LVDS Receiver Threshold Vsync Frequency Main Frequency EDID Input Voltage EDID Input Current Skew Rush Current Current of Power Supply High Low White Mosaic V. Stripe Black Note () Display data pins and timing signal pins should be confujitsuted.( GND = V ) (2) fv = 6Hz, fdclk = MHZ, VDD = 3.3V, DC Current. (3) Max. 7mA is fixed by the average of Max. current in the SEC s test. ( So, almost panels are under 7mA, but please also allow some Max. currents that are over 7mA by peaks. ) (4) Power dissipation pattern Symbol VDD VIH VIL fv fdclk VEDID IEDID RSKM IRUSH IDD Min Typ Max Unit V mv mv Hz MHz V ma ps A ma ma ma ma Ta= 25 ± 2 C Note VCM = +.2V ( +/ % ) VEDID=.8V, fc=4khz fdclk =75.55Mhz (5) (2),(4)*a (2),(4)*b (2),(4)*c (2),(3),(4)*d Doc.No. LTN56AT4F Rev.No 4AS76 Page / 32

11 5) Rush current measurement condition CONTROL SIGNAL (HIGH to LOW) *d) Black Pattern 2V 3.3V C3 uf R 47K R3 47K R2 K C2 M 2SK59 pf M2 2SK399 VDD rising time is 47us GND FUSE VDD C uf VDD VDD ( LCD INPUT) 47us V Doc.No. LTN56AT4F Rev.No 4AS76 Page / 32

12 3.2 BACKLIGHT UNIT Ta= 25 ± 2 C Item Operating Life Time Symbol Hr Min. 2, Typ. Note () Life time (Hr) of LEDs can be defined as the time in which it continues to operate under the condition Ta= 25 ± 2 C and PWM duty = % until one of the following event occurs. When the brightness becomes 5% or lower than the original. 3.3 LED Driver LED Driver Manufacturer Intersil (ISL9767) Item Input Voltage VLED on level voltage VLED off level voltage Input Current Input Power PWM duty ratio PWM Frequency PWM Impedance PWM high level vol. PWM low level vol. LED_EN Impedance LED_EN high vol. LED_EN low vol. LED rush current Symbol VBL VLED_on VLED_off I Pin FPWM ZPWM VPWM_H VPWM_L ZPWM VLED_EN_H VLED_EN_L ILED RUSH Min Max. Unit Hr Note () Ta= 25 ± 2 C Note () PWM can be guaranteed under the same condition as operation temperate TOPR ~ 5. Typ Max Unit V V V ma W % KHz Mohm V V Mohm V V A Note Duty=%, V BLU =2V Pin = VBL x I, VBLU = 2V () () Doc.No. LTN56AT4F Rev.No 4AS76 Page 2 / 32

13 4. BLOCK DIAGRAM 4. TFT LCD Module Input ConFujitsutor IPEX 24554E2 Video Signal Control Signal VCOM Gamma DVDD AVDD Von/Voff LVDS DCDC Converter DCDC Converter VCOM Generator LVDS Input/LCDS Output Timing Controller 4.2 LED confujitsution and placement 8 LEDs x 8 channels = Total 64 LEDs 8 8 Gamma Generator SOURCE PCB mlvds Source Driver IC TFT on Glass 5.6 HD TFTLCD Panel Doc.No. LTN56AT4F Rev.No 4AS76 Page 3 / 32

14 5. INPUT TERMINAL PIN ASSIGNMENT 5.. Input Signal & Power LVDS, ConFujitsutor IPEX 24554E2R Mating ConFujitsutor IPEX 24544T Pin ~ ~ ~ ~3 3~ NC VCC VCC WPN RXin RXin RXin+ GND RXin2 RXn+ GND ClkIN RXn2+ GND ClkIN+ GND NC GND NC GND NC GND NC GND NC PWM Symbol VCC_EDID CLK_EDID DATA_EDID Power Supply, 3.3V (typical) Power Supply, 3.3V (typical) DDC 3.3V power EDID writing proction DDC clock DDC data LVDS Oth Signal Negative (Odd) LVDS Oth Signal Positive (Odd) Ground LVDS st Signal Negative (Odd) LVDS st Signal Positive (Odd) Ground LVDS 2nd Signal Negative (Odd) LVDS 2nd Signal Positive (Odd) Ground LVDS Clock Signal Negative (Odd) LVDS Clock Signal Positive (Odd) Ground No ConFujitsution Ground No ConFujitsution Ground No ConFujitsution Ground No ConFujitsution Ground No ConFujitsution PWM for luminance control Function No ConFujitsution (Reserved for supplier) LED_EN BL On/Off ( On.5 ~ 5., Off ~.8V ) 37 38~4 NC VBL(7~2) No ConFujitsution LED power supply 7V ~ 2V Doc.No. LTN56AT4F Rev.No 4AS76 Page 4 / 32

15 5.2 LVDS Interface Transmitter DS9CF363 or Compatible Pin No. Name RGB Signal Pin No. Name RGB Signal Note The LCD Module uses a ohm resistor between positive and negative lines of each receiver input. 5 TxIN R 4 TxIN4 G5 52 TxIN R 5 TxIN5 B 54 TxIN2 R2 9 TxIN8 B 55 TxIN3 R3 2 TxIN9 B2 56 TxIN4 R4 22 TxIN2 B3 3 TxIN6 R5 23 TxIN2 B4 4 TxIN7 G 24 TxIN22 B5 6 TxIN8 G 27 TxIN24 Hsync 7 TxIN9 G2 28 TxIN25 Vsync TxIN2 G3 3 TxIN26 DE 2 TxIN3 G4 3 TxCLKIN Clock Graphics controller 8bit RED RED RED2 RED3 RED4 RED5 GREEN GREEN GREEN2 GREEN3 GREEN4 GREEN5 BLUE BLUE BLUE2 BLUE3 BLUE4 BLUE5 Hsync Vsync Enable CLOCK LVDS INTERFACE DS9CF383 TxOUT+ TxOUT+ TxOUT2+ RxCLKIN TxOUT TxOUT TxOUT2 TxCLKOUT TxCLKOUT IPEX 24554E2R Ω Ω Ω Integrated IC RxIN+ RxIN+ Ω RxIN2+ RxIN RxIN RxIN2 RxCLKIN+ Doc.No. LTN56AT4F Rev.No 4AS76 Page 5 / 32

16 5.3 LVDS characteristics < Definition of LVDS AC characteristics > Tclk Doc.No. LTN56AT4F Rev.No 4AS76 Page 6 / 32

17 Doc.No. Rev.No Page / 32 LTN56AT4F 7 4AS Input Signals, Basic Display Colors and Gray Scale of Each Color Note ) Definition of gray Rn Red gray, Gn Green gray, Bn Blue gray (n=gray level) Note 2)Input signal =Low level voltage, =High level voltage B3 B6 B2 B Dark B Black Gray Scale Of Blue G6 G3 G6 G2 G Dark G Black Gray Scale Of Green B63 Blue B62 Light B6 G63 Green G62 Light R63 Red R62 Light R6 R3 R6 R2 R Dark R Black Gray Scale Of Red White Yellow Magenta Red Cyan Green Blue Black Basic Colors B5 45 B3 B2 B B G5 G4 G3 G2 G G R5 R4 R3 R2 R R Blue Green Red Gray Scale Level Data Signal Display Color

18 5.5 Pixel Format in the display Line Line 768 Pixel Pixel 366 R G B R G B R G B R G B LTN56AT4N R G B R G B R G B R G B Doc.No. LTN56AT4F Rev.No 4AS76 Page 8 / 32

19 6. INTERFACE TIMING 6. Timing Parameters Signal Frame Frequency Vertical Active Display Term One Line Scanning Time Horizontal Active Display Term Item Cycle Display Period Cycle Display Period Symbol TV TVD TH THD 6.2 Timing diagrams of interface signal Min Typ Note ) DE signal always should have the same cycle during operation. DE DCLK TC TVD TV TH Max Unit Lines Lines Clocks Pixels DE DATA SIGNALS THD Valid display data ( 366 clocks) Note 2pixel /clock () Doc.No. LTN56AT4F Rev.No 4AS76 Page 9 / 32

20 6.3 Power ON/OFF Sequence To prevent a latchup or DC operation of the LCD module, the power on/off sequence should be as the diagram below. V V LED Power (V BL ) Timing (ms) <T <T 2 5 <T < LED Enable Power ON/OFF Sequence.9 V DD.9 VDD Power Supply VDD. V DD. V DD PWM T T2 T5 VALID Doc.No. LTN56AT4F Rev.No 4AS76 Page 2 / 32 T6 T3.9 LED VBL.9 LED VBL. LED VBL. LED VBL T2 T3 T8 T4 T Signals Delay from valid data to LED enable at power ON 2 T 6 Delay from valid data off to LED disable at power Off <T 7 <T < <T 2 Delay from LED driver VBL rising time 9% to PWM ON Delay from PWM Off to LED driver VBL falling time % <T 3 <T 4 <T 5 T T5 Remarks V DD rising time from % to 9% <T 3 5 Delay from valid data OFF to V DD OFF at power Off 4 T 4 V DD OFF time for Windows restart 2 T 5 V DD falling time from 9% to % LED VBL rising time from % to 9% LED VBL falling time from 9% to % Delay from PWM ON to LED Enable ON Delay from B/L Enable Off to PWM Off T9 Delay from V DD to valid data at power ON Timing Parameters and definition Note () Regarding the timing of T8 and T9, the following one are recommended <T8 Delay from valid data on to LED driver VBL rising time % <T9 Delay from LED driver VBL falling time % to valid data Off T7 T4

21 7. MECHANICAL OUTLINE DIMENSION [ Refer to the next page ] Doc.No. LTN56AT4F Rev.No 4AS76 Page 2 / 32

24 8. PACKING. CARTON(Internal Package) () Cushion Pad Corrugated fiberboard box and corrugated cardboard as shock absorber (2) Packing Method Note ) Total Weight Approximately 5. kg 2) Acceptance number of piling 2 sets 3) Carton size 344(W) x 432(D) x 329 (H) 4) MAX accumulation quantity 5 cartons Doc.No. LTN56AT4F Rev.No 4AS76 Page 24 / 32

(3)Packing Material No 2 3 4 Part name Quantity Static electric protective sack 2 Cushion Top

25 (3)Packing Material No Part name Quantity Static electric protective sack 2 Cushion Top set Cushion Bottom Pictorial marking 2 pcs Carton set Doc.No. LTN56AT4F Rev.No 4AS76 Page 25 / 32

26 9. MARKINGS & OTHERS A nameplate bearing followed by is affixed to a shipped product at the specified location on each product. ()Parts number LTN56AT4F (2)Revision code 3 letters (3)Lot number X X X X XX XX XX F (4) Nameplate Indication C C US 5 MADE IN CHINA High voltage caution label HIGH VOLTAGE CAUTION RISK OF ELECTRIC SHOCK DISCONFujitsuT THE ELECTRIC POWER BEFORE SERVICE USP / USP52837 LTN56AT4 XXXXXXXXXX CP mm 7mm SEC Revision Code Panel number Cell ID Lot ID Month Year Product Code Line F A Parts name LTN56AT4 Lot number XXXXXXXXXX Inspected work week 5 (2 year 5 th week) Product Revision Code F US Patents No. USP / USP52837 Fujitsu s part No. CP49642 A THIS COVER CONTAINS FLUORESCENT LAMP. PLEASE FOLLOW LOCAL ORDINANCES OR REGULATIONS FOR ITS DISPOSAL 4 mm mm High voltage caution Doc.No. LTN56AT4F Rev.No 4AS76 Page 26 / 32

27 (5) Packing small box attach DEVICE TYPE QUANTITY CO64 CP49642 LTN56AT4 F 2 PCS A Doc.No. LTN56AT4F Rev.No 4AS76 Page 27 / 32

28 . GENERAL PRECAUTIONS. Handling (a) When the module is assembled, It should be attached to the system firmly using every mounting holes. Be careful not to twist and bend the modules. (b) Refrain from strong mechanical shock and / or any force to the module. In addition to damage, this may cause improper operation or damage to the module and CCFT backlight. (c) Note that polarizers are very fragile and could be easily damaged. Do not press or scratch the surface harder than a HB pencil lead. (d) Wipe off water droplets or oil immediately. If you leave the droplets for a long time, Staining and discoloration may occur. (e) If the surface of the polarizer is dirty, clean it using some absorbent cotton or soft cloth. (f) The desirable cleaners are water, IPA (Isoprophyl Alcohol) or Hexane. Do not use Ketone type materials(ex. Acetone), Ethyl alcohol, Toluene, Ethyl acid or Methyl chloride. It might permanent damage to the polarizer due to chemical reaction. (g) If the liquid crystal material leaks from the panel, it should be kept away from the eyes or mouth. In case of contact with hands, legs or clothes, it must be washed away thoroughly with soap. (h) Protect the module from static, it may cause damage to the CMOS Gate Array IC. (i) Use fingerstalls with soft gloves in order to keep display clean during the incoming inspection and assembly process. (j) Do not disassemble the module. (k) Do not pull or fold the lamp wire. (l) Do not adjust the variable resistor which is located on the back side. (m) Protection film for polarizer on the module shall be slowly peeled off just before use so that the electrostatic charge can be minimized. (n) Pins of I/F confujitsutor shall not be touched directly with bare hands. Doc.No. LTN56AT4F Rev.No 4AS76 Page 28 / 32

29 2. STORAGE (a) Do not leave the module in high temperature, and high humidity for a long time. It is highly recommended to store the module with temperature from to 35 C and relative humidity of less than 7%. (b) Do not store the TFTLCD module in direct sunlight. (c) The module shall be stored in a dark place. It is prohibited to apply sunlight or fluorescent light during the store. 3. OPERATION (a) Do not confujitsut,disconfujitsut the module in the Power On condition. (b) Power supply should always be turned on/off by following item 6.3 Power on/off sequence. (c) Module has high frequency circuits. Sufficient suppression to the electromagnetic interference shall be done by system manufacturers. Grounding and shielding methods may be important to minimize the interference. (d) The cable between the backlight confujitsutor and its inverter power supply shall be a minimized length and be confujitsuted directly. The longer cable between the backlight and the inverter may cause lower luminance of lamp(ccft) and may require higher startup voltage (Vs). (e) The standard limited warranty is only applicable when the module is used for general notebook applications. If used for purposes other than as specified, SEC is not to be held reliable for the defective operations. It is strongly recommended to contact SEC to find out fitness for a particular purpose. ( f ) When you confujitsut a signal cable to LCD, remove an AC adapter by all means. In addition, to confujitsut with keep the correct sequence, not to occur the short by left voltage. 4. OTHERS (a) Ultraviolet ray filter is Fujitsuessary for outdoor operation. (b) Avoid condensation of water. It may result in improper operation or disconfujitsution of electrode. (c) Do not exceed the absolute maximum rating value. ( the supply voltage variation, input voltage variation, variation in part contents and environmental temperature, so on) Otherwise the module may be damaged. (d) If the module displays the same pattern continuously for a long period of time,it can be the situation when the image sticks to the screen. (e) This module has its circuitry PCB s on the rear side and should be handled carefully in order not to be stressed. Doc.No. LTN56AT4F Rev.No 4AS76 Page 29 / 32

30 . EDID Doc.No. LTN56AT4F Rev.No 4AS76 Page 3 / 32

31 Doc.No. LTN56AT4F Rev.No 4AS76 Page 3 / 32

32 Doc.No. LTN56AT4F Rev.No 4AS76 Page 32 / 32

Application engineering part, Mobile Division Samsung Electronics Co., Ltd.

Application engineering part, Mobile Division Samsung Electronics Co., Ltd. TO DATE : General : Jan. 25, 2013 SAMSUNG TFT-LCD MODEL NO. : LTN156AT19-0 NOTE : Extension code [ - 0xx ] LTN156AT19-0xx Surface type [ A/G ] Any modification of Spec is not allowed without SEC s permission