DAC38J82: Serdes PLL无法锁定，FIFO报错

z xx

Part Number: DAC38J82
Other Parts Discussed in Thread: LMK04828

你好，

我在使用DAC38J82进行开发时，配置参数后，Serdes PLL无法锁定，且FIFO报错；

我使用DAC3XJ8X GUI v1.3软件生成所需参数，生成参数后未做任何更改，参数配置如下图所示。

LMK04828
0x00 0x00
0x02 0x00
0x100 0x01
0x101 0x55
0x103 0x00
0x104 0x20
0x105 0x00
0x106 0xF0
0x107 0x11
0x108 0x61
0x109 0x55
0x10B 0x01
0x10C 0x20
0x10D 0x00
0x10E 0xF0
0x10F 0x76
0x110 0x08
0x111 0x55
0x113 0x00
0x114 0x00
0x115 0x00
0x116 0xF9
0x117 0x00
0x118 0x18
0x119 0x55
0x11B 0x00
0x11C 0x20
0x11D 0x00
0x11E 0xF9
0x11F 0x00
0x120 0x10
0x121 0x55
0x123 0x00
0x124 0x00
0x125 0x00
0x126 0xF9
0x127 0x11
0x128 0x08
0x129 0x55
0x12B 0x00
0x12C 0x00
0x12D 0x00
0x12E 0xF9
0x12F 0x00
0x130 0x08
0x131 0x55
0x133 0x00
0x134 0x20
0x135 0x00
0x136 0xF9
0x137 0x01
0x138 0x40
0x139 0x02
0x13A 0x00
0x13B 0xA0
0x13C 0x00
0x13D 0x08
0x13E 0x03
0x13F 0x00
0x140 0x00
0x141 0x00
0x142 0x00
0x143 0x12
0x144 0xFF
0x145 0x00
0x146 0x10
0x147 0x12
0x148 0x02
0x149 0x42
0x14A 0x02
0x14B 0x16
0x14C 0x00
0x14D 0x00
0x14E 0xC0
0x14F 0x7F
0x150 0x03
0x151 0x02
0x152 0x00
0x153 0x00
0x154 0x78
0x155 0x00
0x156 0x78
0x157 0x00
0x158 0x96
0x159 0x00
0x15A 0x78
0x15B 0xF4
0x15C 0x20
0x15D 0x00
0x15E 0x00
0x15F 0x0B
0x160 0x00
0x161 0x01
0x162 0x44
0x163 0x00
0x164 0x00
0x165 0x0C
0x166 0x00
0x167 0x00
0x168 0x0C
0x169 0x5B
0x16A 0x20
0x16B 0x00
0x16C 0x00
0x16D 0x00
0x16E 0x13
0x17C 0x15
0x17D 0x0F
DAC_RESET
0x00 0x1
DAC3XJ8X
0x00 0x0018
0x01 0x0003
0x02 0x2002
0x03 0xA300
0x04 0xF0F0
0x05 0xFF07
0x06 0xFFFF
0x07 0x3100
0x08 0x0000
0x09 0x0000
0x0A 0x0000
0x0B 0x0000
0x0C 0x0400
0x0D 0x0400
0x0E 0x0400
0x0F 0x0400
0x10 0x0000
0x11 0x0000
0x12 0x0000
0x13 0x0000
0x14 0x0000
0x15 0x0000
0x16 0x0000
0x17 0x0000
0x18 0x0000
0x19 0x0000
0x1A 0x0023
0x1B 0x0000
0x1E 0x9999
0x1F 0x9980
0x20 0x8008
0x22 0x1B1B
0x23 0x01FF
0x24 0x0020
0x25 0x2000
0x26 0x0000
0x2D 0x0001
0x2E 0xFFFF
0x2F 0x0004
0x30 0x0000
0x31 0x1000
0x32 0x0000
0x33 0x0000
0x34 0x0000
0x3B 0x0000
0x3C 0x0050
0x3D 0x0088
0x3E 0x0148
0x3F 0x0000
0x46 0x1882
0x47 0x01C8
0x48 0x3143
0x49 0x0000
0x4A 0x0F3E
0x4B 0x1200
0x4C 0x1303
0x4D 0x0100
0x4E 0x0F4F
0x4F 0x1C61
0x50 0x0000
0x51 0x00DC
0x52 0x00FF
0x53 0x0000
0x54 0x00FC
0x55 0x00FF
0x56 0x0000
0x57 0x00FF
0x58 0x00FF
0x59 0x0000
0x5A 0x00FF
0x5B 0x00FF
0x5C 0x1133
0x5E 0x0000
0x5F 0x3210
0x60 0x5764
0x61 0x0211
0x64 0x0001
0x65 0x0001
0x66 0x0001
0x67 0x0001
0x68 0x7709
0x69 0x0000
0x6A 0x0000
0x6B 0xBD07
0x6C 0x0007
0x6D 0x0090
0x6E 0x0000
0x6F 0x0000
0x70 0x0000
0x71 0x0000
0x72 0x0000
0x73 0x0000
0x74 0x0000
0x75 0x0000
0x76 0x0000
0x77 0x0000
0x78 0x0000
0x79 0x0000
0x7A 0x0000
0x7B 0x0000
0x7C 0x0000
0x7D 0x0000

2 年多前

0 Amy Luo 2 年多前

TI__Guru**** 185470 points

您好，感谢您对TI产品的关注！为更加有效地解决您的问题，我需要询问更了解这款芯片的TI资深工程师。

0 z xx 2 年多前回复 Amy Luo

多谢您的回复，但目前尚未看到进一步的回复。

0 Amy Luo 2 年多前回复 z xx

TI__Guru**** 185470 points

因为前2天是周末，所以没有回复。我得到反馈后，会在这里回复您的，请耐心等一下。

0 Amy Luo 2 年多前回复 z xx

TI__Guru**** 185470 points

您好，已得到回复如下

此错误通常与时钟问题有关。这是自己设计的板还是TI EVM？

1.FPGA和DAC是否接收到正确的时钟和SYSREF（频率和振幅）？

2.SYNC的状态是什么？DAC在CGS之后发送高吗？

3.DAC和FPGA上的链路参数是否正确（K、L、M、F、S等）？

4.提供时钟和电源后，DAC是否发出硬复位？

请运行附带的仅限NCO的测试，该测试将验证DAC38J82 SPI、时钟和电源是否正确。

7840.DAC38J84 100MHz NCO Test.pptx

0 z xx 2 年多前回复 Amy Luo

非常感谢您的回复，针对您提出的问题及测试情况回复如下：

此错误通常与时钟问题有关。这是自己设计的板还是TI EVM？

回复：该调试板为自己设计的板，为LMK04828+DAC38J82的组合；

1.FPGA和DAC是否接收到正确的时钟和SYSREF（频率和振幅）？

回复：由于未预留测试点，只能从侧面推测时钟状态。从FPGA内部通过ILA查看，FPGA接收到的时钟和SYSREF频率正确。由于LMK04828输出到DAC的时钟和输出到FPGA的时钟只有参数不同，且DAC38J82采用PLL配置方式时，DAC的PLL能够锁定，我认为DAC接收到的时钟正确；

2.SYNC的状态是什么？DAC在CGS之后发送高吗？

回复：DAC参数配置完成后，SYNC始终保持为高，但不确定具体什么时刻拉高的。

3.DAC和FPGA上的链路参数是否正确（K、L、M、F、S等）？

回复：经过多次核对，二者参数配置一致。

4.提供时钟和电源后，DAC是否发出硬复位？

回复：实际工作流程为，先配置LMK04828的参数，该器件配置完成后，FPGA输出低脉冲，对DAC进行复位，然后再配置DAC参数；

请运行附带的仅限NCO的测试，该测试将验证DAC38J82 SPI、时钟和电源是否正确。

回复：根据你提供的资料，结合器件型号，参数配置截图如下：

另附DAC38J82和LMK04828参数文件及配置顺序文件

3882_4lanes.cfg

LMK04828_HexRegisterValues.txt

R0 (INIT)	0x000090
R0	0x000010
R2	0x000200
R3	0x000306
R4	0x0004D0
R5	0x00055B
R6	0x000600
R12	0x000C51
R13	0x000D04
R256	0x010000
R257	0x010155
R258	0x010255
R259	0x010301
R260	0x010422
R261	0x010500
R262	0x0106F0
R263	0x010711
R264	0x010864
R265	0x010955
R266	0x010A55
R267	0x010B04
R268	0x010C22
R269	0x010D00
R270	0x010EF0
R271	0x010F77
R272	0x011008
R273	0x011155
R274	0x011255
R275	0x011300
R276	0x011402
R277	0x011500
R278	0x0116F9
R279	0x011700
R280	0x01180C
R281	0x011955
R282	0x011A55
R283	0x011B00
R284	0x011C22
R285	0x011D00
R286	0x011EF0
R287	0x011F33
R288	0x01200C
R289	0x012155
R290	0x012255
R291	0x012300
R292	0x012422
R293	0x012500
R294	0x0126F0
R295	0x012711
R296	0x012808
R297	0x012955
R298	0x012A55
R299	0x012B00
R300	0x012C02
R301	0x012D00
R302	0x012EF9
R303	0x012F00
R304	0x01300C
R305	0x013155
R306	0x013255
R307	0x013300
R308	0x013422
R309	0x013500
R310	0x0136F1
R311	0x013731
R312	0x013825
R313	0x013902
R314	0x013A03
R315	0x013BC0
R316	0x013C00
R317	0x013D08
R318	0x013E01
R319	0x013F00
R320	0x01408A
R321	0x014100
R322	0x014200
R323	0x014312
R324	0x014400
R325	0x01457F
R326	0x014600
R327	0x01471A
R328	0x014802
R329	0x014942
R330	0x014A02
R331	0x014B16
R332	0x014C00
R333	0x014D00
R334	0x014EC0
R335	0x014F7F
R336	0x015003
R337	0x015102
R338	0x015200
R339	0x015300
R340	0x015478
R341	0x015500
R342	0x015678
R343	0x015700
R344	0x015896
R345	0x015900
R346	0x015A78
R347	0x015BD4
R348	0x015C20
R349	0x015D00
R350	0x015E00
R351	0x015F0B
R352	0x016000
R353	0x016101
R354	0x016244
R355	0x016300
R356	0x016400
R357	0x01650C
R369	0x0171AA
R370	0x017202
R380	0x017C15
R381	0x017D33
R358	0x016600
R359	0x016700
R360	0x01680C
R361	0x016959
R362	0x016A20
R363	0x016B00
R364	0x016C00
R365	0x016D00
R366	0x016E13
R371	0x017300
R386	0x018200
R387	0x018300
R388	0x018400
R389	0x018500
R392	0x018800
R393	0x018900
R394	0x018A00
R395	0x018B00
R8189	0x1FFD00
R8190	0x1FFE00
R8191	0x1FFF53

spi_3882.txt

        send_data[0  ] <= 24'h4A_0F_3E;
        send_data[1  ] <= 24'h24_00_00;
        send_data[2  ] <= 24'h5C_00_00;
        send_data[3  ] <= 24'h00_01_18;                              
        send_data[4  ] <= 24'h01_00_03;                              
        send_data[5  ] <= 24'h02_20_50;                              
        send_data[6  ] <= 24'h03_A3_00;                              
        send_data[7  ] <= 24'h04_F0_F0;                              
        send_data[8  ] <= 24'h05_FF_07;                              
        send_data[9  ] <= 24'h06_FF_FF;                              
        send_data[10 ] <= 24'h07_31_00;                              
        send_data[11 ] <= 24'h08_00_00;                              
        send_data[12 ] <= 24'h09_00_00;                              
        send_data[13 ] <= 24'h0A_00_00;                              
        send_data[14 ] <= 24'h0B_00_00;                              
        send_data[15 ] <= 24'h0C_04_00;                              
        send_data[16 ] <= 24'h0D_04_00;                              
        send_data[17 ] <= 24'h0E_04_00;                              
        send_data[18 ] <= 24'h0F_04_00;                              
        send_data[19 ] <= 24'h10_00_00;                              
        send_data[20 ] <= 24'h11_00_00;                              
        send_data[21 ] <= 24'h12_00_00;                              
        send_data[22 ] <= 24'h13_00_00;                              
        send_data[23 ] <= 24'h14_38_E4;                              
        send_data[24 ] <= 24'h15_E3_8E;                              
        send_data[25 ] <= 24'h16_22_B8;                              
        send_data[26 ] <= 24'h17_00_00;                              
        send_data[27 ] <= 24'h18_00_00;                              
        send_data[28 ] <= 24'h19_00_00;                              
        send_data[29 ] <= 24'h1A_00_20;                              
        send_data[30 ] <= 24'h1B_00_00;
        send_data[31 ] <= 24'h1E_99_99;                              
        send_data[32 ] <= 24'h1F_99_80;                              
        send_data[33 ] <= 24'h20_80_08;                              
        send_data[34 ] <= 24'h22_1B_1B;                              
        send_data[35 ] <= 24'h23_01_FF;                              
        send_data[36 ] <= 24'h25_40_00;
        send_data[37 ] <= 24'h26_00_00;
        send_data[38 ] <= 24'h2D_00_01;
        send_data[39 ] <= 24'h2E_FF_FF;
        send_data[40 ] <= 24'h2F_00_05;
        send_data[41 ] <= 24'h30_00_00;
        send_data[42 ] <= 24'h31_10_00;
        send_data[43 ] <= 24'h32_00_00;
        send_data[44 ] <= 24'h33_00_00;
        send_data[45 ] <= 24'h34_00_00;
        send_data[46 ] <= 24'h3B_08_00;
        send_data[47 ] <= 24'h3C_02_28;
        send_data[48 ] <= 24'h3D_00_88;
        send_data[49 ] <= 24'h3E_01_28;
        send_data[50 ] <= 24'h3F_00_00;
        send_data[51 ] <= 24'h46_18_82;
        send_data[52 ] <= 24'h47_01_C8;
        send_data[53 ] <= 24'h48_31_43;
        send_data[54 ] <= 24'h49_00_00;
        send_data[55 ] <= 24'h4B_12_00;
        send_data[56 ] <= 24'h4C_13_03;
        send_data[57 ] <= 24'h4D_01_00;
        send_data[58 ] <= 24'h4E_0F_4F;
        send_data[59 ] <= 24'h4F_1C_61;
        send_data[60 ] <= 24'h50_00_00;
        send_data[61 ] <= 24'h51_00_DC;
        send_data[62 ] <= 24'h52_00_FF;
        send_data[63 ] <= 24'h53_00_00;
        send_data[64 ] <= 24'h54_00_FC;
        send_data[65 ] <= 24'h55_00_FF;
        send_data[66 ] <= 24'h56_00_00;
        send_data[67 ] <= 24'h57_00_FF;
        send_data[68 ] <= 24'h58_00_FF;
        send_data[69 ] <= 24'h59_00_00;
        send_data[70 ] <= 24'h5A_00_FF;
        send_data[71 ] <= 24'h5B_00_FF;
        send_data[72 ] <= 24'h5E_00_00;
        send_data[73 ] <= 24'h5F_32_10;
        send_data[74 ] <= 24'h60_57_64;
        send_data[75 ] <= 24'h61_02_11;
        send_data[76 ] <= 24'h6D_00_90;
        send_data[77 ] <= 24'h6E_00_00;
        send_data[78 ] <= 24'h6F_00_00;
        send_data[79 ] <= 24'h70_00_00;
        send_data[80 ] <= 24'h71_00_00;
        send_data[81 ] <= 24'h72_00_00;
        send_data[82 ] <= 24'h73_00_00;
        send_data[83 ] <= 24'h74_00_00;
        send_data[84 ] <= 24'h75_00_00;
        send_data[85 ] <= 24'h76_00_00;
        send_data[86 ] <= 24'h77_00_00;
        send_data[87 ] <= 24'h78_00_00;
        send_data[88 ] <= 24'h79_00_00;
        send_data[89 ] <= 24'h7A_00_00;
        send_data[90 ] <= 24'h7B_00_00;
        send_data[91 ] <= 24'h7C_00_00;
        send_data[92 ] <= 24'h7D_00_00;
        send_data[93 ] <= 24'h24_00_20;
        send_data[94 ] <= 24'h5C_11_33;
        send_data[95 ] <= 24'h4A_0F_3E;
        send_data[96 ] <= 24'h4A_0F_3F;
        send_data[97 ] <= 24'h4A_0F_21;
        send_data[98 ] <= 24'h03_A3_01;
        send_data[99 ] <= 24'h64_00_00;
        send_data[100] <= 24'h65_00_00;
        send_data[101] <= 24'h66_00_00;
        send_data[102] <= 24'h67_00_00;
        send_data[103] <= 24'h68_00_00;
        send_data[104] <= 24'h69_00_00;
        send_data[105] <= 24'h6A_00_00;
        send_data[106] <= 24'h6B_00_00;
        send_data[107] <= 24'h6C_00_00;
        send_data[108] <= 24'h00_00_00;

最终输出信号频谱如下：