ADV7393 ED TEST BAR

Question

hello， 
 I have a question about the test pattern of the ED. 
 so, I want to generate a test black bar with YPBPR ,I set the register 
 0x00 -> 0x1c 
 0x01 -> 0x10 
 0x31 -> 0x05 
 0x02 -> 0x24 
 nothing on the screen, 
 and I set the NTSC test black bar 
 0x00 -> 0x1c 
 0x82 -> 0xc9 
 0x84 -> 0x40 
 it is sucessfull 
 are there some differents about ED and SD in the hardware ? 
 the DAC1 wave of 'SD' 
 
 the DAC1 WAVE of 'ED'

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ADV7393 ED TEST BAR