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ADV7842 : TMDS_LCK_A_ST(TMDS_LCK_A_RAW) generate logic

Question asked by aimPoint on Feb 17, 2014
Latest reply on Feb 25, 2014 by aimPoint

Hi all.
We use ADV7842 for HDMI input.
We check the HDMI ch.A input  by TMDS_LCK_A_ST interrupt.


1st TMDS_LCK_A_ST interrupt arrived  when TMDS_LCK_A_RAW(IO map 0x6B[5]) is 0 with TMDS_PLL_LOCKED(HDMI map 0x04[1]) is 1.
And 2nd TMDS_LCK_A_ST interrupt arrived  when TMDS_LCK_A_RAW(IO map 0x6B[5]) is 1 with TMDS_PLL_LOCKED(HDMI map 0x04[1]) is 1.
We confirmed the TMDS_PLL_LOCKED bit is continuous 1 when  TMDS_LCK_A_RAW bit is between 0 move to 1.


TMDS_LCK_A_ST interrupt was occur without the TMDS_PLL_LOCKED.
The TMDS_LCK_A_ST(TMDS_LCK_A_RAW)  logic circuit is independent of the TMDS_PLL_LOCKED logic circuit.
The TMDS_LCK_A_ST(TMDS_LCK_A_RAW) is generated by HDMI chA input signal.
Is this correct?


Best regards.
aimPoint

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