We use the single HMC7043 to generate DCLK and SYSREF,when we are at -40 degrees Celsius,We found that sometimes when power on star up,SYSREF will not boot to boot.
Our clock frequency is 245.76MHz, and the sysref frequency is 960kHz .When sysref not boot to boot,the difference is an integer multiple of 245.76MHz.
What could be the reason for this problem? And how to do with this problem.
when not boot to boot oscilloscope
Our register configuration below
hmc7043 0x0000,0x00, 0x0001,0x02, 0x0002,0x00, 0x0003,0x04, 0x0004,0x7F, 0x0006,0x00, 0x000A,0x00, 0x000B,0x07, 0x0046,0x00, 0x0050,0x0F, 0x0054,0x03, 0x005A,0x07, 0x005B,0x00, 0x005C,0x80, 0x005D,0x02, 0x0064,0x01, 0x0065,0x00, 0x0071,0x16, 0x00A0,0xDF, 0x00C8,0xF3, //DCLK 0x00C9,0x01, 0x00CA,0x00, 0x00CB,0x00, 0x00CC,0x00, 0x00CD,0x00, 0x00CE,0x00, 0x00CF,0x03, 0x00D0,0x01, 0x00D2,0xFD, //sysref 0x00D3,0x00, 0x00D4,0x01, 0x00D5,0x00, 0x00D6,0x00, 0x00D7,0x00, 0x00D8,0x00, 0x00D9,0x00, 0x00DA,0x30, 0x00DC,0xF3, //DCLK 0x00DD,0x01, 0x00DE,0x00, 0x00DF,0x00, 0x00E0,0x00, 0x00E1,0x00, 0x00E2,0x00, 0x00E3,0x03, 0x00E4,0x01, 0x00E6,0xFD, //sysref 0x00E7,0x00, 0x00E8,0x01, 0x00E9,0x00, 0x00EA,0x00, 0x00EB,0x00, 0x00EC,0x00, 0x00ED,0x00, 0x00EE,0x10, 0x00F0,0xF3, //DCLK 0x00F1,0x01, 0x00F2,0x00, 0x00F3,0x00, 0x00F4,0x00, 0x00F5,0x00, 0x00F6,0x00, 0x00F7,0x03, 0x00F8,0x01, 0x00FA,0xFD, //sysref 0x00FB,0x00, 0x00FC,0x01, 0x00FD,0x00, 0x00FE,0x00, 0x00FF,0x00, 0x0100,0x00, 0x0101,0x00, 0x0102,0x10, 0x0104,0xF3, //DCLK 0x0105,0x01, 0x0106,0x00, 0x0107,0x00, 0x0108,0x00, 0x0109,0x00, 0x010A,0x00, 0x010B,0x03, 0x010C,0x01, 0x010E,0xFD, //sysref 0x010F,0x00, 0x0110,0x01, 0x0111,0x00, 0x0112,0x00, 0x0113,0x00, 0x0114,0x00, 0x0115,0x00, 0x0116,0x10, 0x0118,0xF3, //DCLK 0x0119,0x01, 0x011A,0x00, 0x011B,0x00, 0x011C,0x00, 0x011D,0x00, 0x011E,0x00, 0x011F,0x03, 0x0012,0x01, 0x0122,0xFD, //sysref 0x0123,0x00, 0x0124,0x01, 0x0125,0x00, 0x0126,0x00, 0x0127,0x00, 0x0128,0x00, 0x0129,0x00, 0x012A,0x10, 0x012C,0xF3, //DCLK 0x012D,0x01, 0x012E,0x00, 0x012F,0x00, 0x0130,0x00, 0x0131,0x00, 0x0132,0x00, 0x0133,0x03, 0x0134,0x01, 0x0136,0xFD, //sysref 0x0137,0x00, 0x0138,0x01, 0x0139,0x00, 0x013A,0x00, 0x013B,0x00, 0x013C,0x00, 0x013D,0x00, 0x013E,0x10, 0x0140,0xF3, //DCLK 0x0141,0x01, 0x0142,0x00, 0x0143,0x00, 0x0144,0x00, 0x0145,0x00, 0x0146,0x00, 0x0147,0x03, 0x0148,0x01, 0x014A,0xF3, //DCLK 0x014B,0x01, 0x014C,0x00, 0x014D,0x00, 0x014E,0x00, 0x014F,0x00, 0x0150,0x00, 0x0151,0x03, 0x0152,0x01, delay100ms 0001,0x02 delay100ms 0001,0x00 delay100ms 0001,0xE0 delay100ms 0001,0xE4 delay100ms 0003,0x13 delay100ms 0003,0x37 delay100ms 0003,0x17
