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Analogue Nagravision (Syster) encoder
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<blockquote data-quote="fsphil" data-source="post: 1079520" data-attributes="member: 410643"><p>ECMs are transmitted several times before they're used by the decoder. I guess this is to provide some redundancy. The order they're transmitted is somewhat shuffled. The two bytes before the ECM on line 15 indicate which ECM part is being transmitted (ignoring the lower 4 bits, the range is 0x00 - 0x7F - each part is half an ECM so the decoder stores 64 ECMs in total, 0x00 and 0x01 are the two halfs of the first ECM).</p><p></p><p>The previous version transmitted the same 8 bytes every time, so all 64 ECMs would be the same 8 bytes repeated twice. But those ECMs where ignored due to what we called the Premiere Bug, where the decoder would use its own CW every time (0x0800A8002800A800). This mode can still be used if you change msg2[1] to:</p><p></p><p>msg2[ 1] = 0x76;</p><p></p><p>And also change all of the CWs in the table to 0x0800A8002800A800.</p><p></p><p>I haven't tested this.</p></blockquote><p></p>
[QUOTE="fsphil, post: 1079520, member: 410643"] ECMs are transmitted several times before they're used by the decoder. I guess this is to provide some redundancy. The order they're transmitted is somewhat shuffled. The two bytes before the ECM on line 15 indicate which ECM part is being transmitted (ignoring the lower 4 bits, the range is 0x00 - 0x7F - each part is half an ECM so the decoder stores 64 ECMs in total, 0x00 and 0x01 are the two halfs of the first ECM). The previous version transmitted the same 8 bytes every time, so all 64 ECMs would be the same 8 bytes repeated twice. But those ECMs where ignored due to what we called the Premiere Bug, where the decoder would use its own CW every time (0x0800A8002800A800). This mode can still be used if you change msg2[1] to: msg2[ 1] = 0x76; And also change all of the CWs in the table to 0x0800A8002800A800. I haven't tested this. [/QUOTE]
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