|
從肥死卡好(Freescale)的一些資料來看,小弟是認為他是畫錯了!
7 F$ j* ?6 n( [, ]: y9 ]& [5 }! {% |) f/ ^0 j3 q
R125 應該是磁珠(Bead)預留位置,左邊的 VCC 應該標為 VDDPLL。8 Y& V2 K6 _2 T. s
4 C' y' ~3 Z% z因為一個人畫錯,之後就成為千古懸案了。3 y' T& l0 @$ P( m7 \) f+ @* ]5 K
4 E: J) |4 g5 b' PXFC – this pin must be connected to an external loop filter to eliminate the VCO (Voltage Controlled Output) input ripple. The needed filter is a second-order, low-pass filter that is used along with the reference frequency to determine the speed of the corrections and the stability of PLL. When the PLL is not used, the XCF pin must be tied to VDDPLL;
: ?: b+ w. I# P" q8 m7 a0 X- x6 o w
9 U" C9 J) ~: s, K$ |
! }) b& R0 R: S- C |
|