Mode Register |
1 |
000000 |
- 对waitrequest模式写入0
- 对轮询模式写入1
|
读/写 |
Status Register |
1 |
000001 |
- 0 = 繁忙(busy)
- 1 = 准备(ready)
|
读取 |
Start Register |
1 |
000010 |
写入0或1以开始小数分频PLL重配置或动态相移 |
写入 |
N Counter |
18 |
000011 |
- N_counter[7:0] = low_count
- N_counter[15:8] = high_count
- Total_div = high_count + low_count
- N_counter[16] = 旁路使能(bypass enable) 1
- N_counter[16] = 0, fREF = fIN/Total_div
- N_counter[16] = 1, fREF = fIN (N计数器被旁路)
- N_counter[17] = 奇数分频(odd division) 1
- N_counter[17] = 0,偶数分频(even division)、占空比 = high_count/Total_div
- N_counter[17] = 1,奇数分频(odd division)、占空比 = (high_count – 0.5)/Total_div
|
读/写 |
M Counter |
18 |
000100 |
- M_counter[7:0] = low_count
- M_counter[15:8] = high_count
- Total_div = high_count + low_count
- M_counter[16] = 旁路使能(bypass enable) 1
- M_counter[16] = 0, fFB = fVCO/Total_div
- M_counter[16] = 1, fFB = fVCO (M计数器被旁路)
- M_counter[17] = 奇数分频(odd division) 1
- M_counter[17] = 0,偶数分频(even division)、占空比 = high_count/Total_div
- M_counter[17] = 1,奇数分频(odd division)、占空比 = (high_count – 0.5)/Total_div
|
读/写 |
C Counter |
23 |
000101 |
- C_counter[7:0] = low_count
- C_counter[15:8] = high_count
- Total_div = high_count + low_count
- C_counter[16] = 旁路使能(bypass enable) 1
- C_counter[16] = 0, fOUT = fVCO/Total_div
- C_counter[16] = 1, fOUT = fVCO (C计数器被旁路)
- C_counter[17] = 奇数分频(odd division) 1
- C_counter[17] = 0,偶数分频(even division)、占空比 = high_count/Total_div
- C_counter[17] = 1,奇数分频(odd division)、占空比 = (high_count – 0.5)/Total_div
- C_counter[22:18]一个5位二进制数,从00000到10001 (0–17)的范围来选择要更改的C计数器。例如:如果要更改C2,就将C_counter[22:18]设置为00010。
|
读/写2 |
Dynamic_Phase_Shift |
22 |
000110 |
- Dynamic_Phase_Shift[15:0] = 移位数
- 移位数 = 想要移位输出时钟的次数。每次执行移位,实际的移位数为1/8的VCO周期。例如:如果VCO运行在1.6 GHz,那么每个相移等于78.125 ps。
- Dynamic_Phase_Shift[20:16] = cnt_select.
- cnt_select是一个5位值,指定要移位的计数器。有关cnt_select映射的更多信息,请参考动态相移计数器和cnt_select (Dynamic_Phase_Shift[20:16])位设置表。
- Dynamic_Phase_Shift[21] = up_dn
- up_dn = 移位的方向。
- up_dn = 1 (正相移)。
- up_dn = 0 (负相移)。
|
写入 |
M Counter Fractional Value (K) |
32 |
000111 |
M计数器(DSM)的小数部分。实际的小数值为:
- MFRAC=K[(X-1):0]/2 X (X = 8、16、24或32) 3
- M计数器最终值 = M计数器的Total_div + MFRAC
|
写入 |
Bandwidth Setting |
4 |
001000 |
有关带宽设置的信息,请参考PLL重配置计算器。 |
读/写 |
Charge Pump Setting |
3 |
001001 |
有关电荷泵设置的信息,请参考PLL重配置计算器。 |
读/写 |
VCO Post Divide Counter Setting 4 |
1 |
011100 |
使能或禁用VCO的/2分频器,保持VCO频率在操作范围内。
- 0: VCO DIV = 1
- 1: VCO DIV = 1
|
读/写 |
.mif Base Address |
9 |
011111 |
在存储初始化文件(.mif)中开始PLL设置档的基地址。 |
写入 |