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DS90UB948-Q1: DS90UB948 AEQ

Part Number: DS90UB948-Q1

Hi Ti Team

        有个关于948的AEQ问题请教下, 1,如下图1:当第0位为1时是固定的EQ?当第0位为0这时候是AEQ?这样理解对吗,还有,AEQ寄存器总共有5位,但是AEQ只有16档位,这16档位和寄存器的5位时怎么对应的。
                                                              2,如下图2:是固定EQ,1-3位是EQ值的高3位,为啥5-7位越大,对应的EQ值越大?
                                                                  
                                                                                                      图1
                                                                   
                                                                                                        图2
  • Hi Wei Hao, 

    Here is a little background on the AEQ and how it works. When the deserializer is powered up, and AEQ is enabled, the device's AEQ adaption will begin and start at the minimum EQ (gain) level and strobe position. The AEQ will increment the gain and strobe levels until the device locks with a partner device (serializer) at the optimal gain/strobe levels. Picture 2 shows the break down of the gain and strobe levels (16 total levels). 

    Like you mentioned, register 0x44 bit 0 is the control bit to enable or disable AEQ. When the AEQ is enabled, the gain level will be determined by the device during power up and the below register (0x3B) can be read to see the values of EQ2 and EQ1.  

    For example, if the minimum EQ level is 10, Register 0x3B will read, 0x1F. The breakdown of the bits are below:

    In the event that AEQ is disabled - bypassed, register 0x44 will need to be manually set to a gain level. For example, if EQ level is manually selected and the gain level is chosen to be 10, this is what register 0x44 will look like. 

    Hope this helps, 

    Shu