Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-06-05 15:58:59 +08:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Minor update to some comments

Browse Source
This commit is contained in:
Gregory Nutt
2015-12-19 08:11:19 -06:00
parent 37194a068e
commit 2bd187a9b0
1 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
configs/launchxl-tms57004/include/board.h
+5 -5
View File
@@ -86,20 +86,20 @@
* *
* Fpllclock = = (Fclkin / NR) x NF / OD / R * Fpllclock = = (Fclkin / NR) x NF / OD / R
* *
* For example, if the clock source is a 16MHz crystal, then * In this case, we have:
* *
* Fclkin = 16,000,000 * Fclkin = 16,000,000
* NR = 6 (REFCLKDIV=5) * NR = 6 (REFCLKDIV=5)
* NF = 120 (PLLMUL = 119 * 256) * NF = 120 (PLLMUL = 119 * 256)
* OD = 1 (ODPLL = 0) * OD = 1 (ODPLL = 0)
* R = 32 (PLLDIV=31) * R = 2 (PLLDIV=1)
* *
* Then: * Then:
* *
* Fintclk = 16 MHz / 6 = 2.667 MHz * Fintclk = 16 MHz / 6 = 2.667 MHz
* Foutputclock = 2.667 MHz * 120 = 320 MHz * Foutputclock = 2.667 MHz * 120 = 320 MHz
* Fpostodclock = 320 MHz / 2 = 160 MHz * Fpostodclock = 320 MHz / 2 = 160 MHz
* Fpllclock = 160 MHz / 2 = 8 MHz * Fpllclock = 160 MHz / 2 = 80 MHz
*/ */
#define BOARD_PLL_NR 6 /* REFCLKDIV = 5 */ #define BOARD_PLL_NR 6 /* REFCLKDIV = 5 */