哪位大神帮忙看看，这个是NVM值是什么意思，是控制什么的，是正反面偏移的位置吗。
C75 NVM调整
Chain Link NVM Item
742 266 -8 Lead Regi Adjust(64-79gsm/Side 1)
742 268 -8 Lead Regi Adjust(91-105gsm/Side 1
742 269 -8 Lead Regi Adjust(106-128gsm/ Side1)
742 270 -8 Lead Regi Adjust(129-150gsm/ Side1)
742 271 -8 Lead Regi Adjust(151-176gsm/ Side1)
742 272 -8 Lead Regi Adjust(177-220gsm/ Side1)
742 273 -8 Lead Regi Adjust(221-256gsm/ Side1)
742 274 -8 Lead Regi Adjust(257-300gsm/ Side1)
742 275 -9 Lead Regi Adjust(64-79gsm/ Side2)
742 277 -9 Lead Regi Adjust(91-105gsm/ Side2)
742 278 -9 Lead Regi Adjust (106-128gsm/Side2
742 279 -9 Lead Regi Adjust (129-150gsm/Side2)
742 280 -9 Lead Regi Adjust(151-176gsm/Sidee2)
742 281 -9 Lead Regi Adjust (177-220gsm/Side 2)
742 282 -9 Lead Regi Adjust(221-256gsm/Side 2)
742 283 -9 Lead Regi Adjust(257-300gsm/Side 2)