Samsung S5PC100, User Manual

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S5PC100 USER’S MANUAL (REV1.0) MIPI DSIM
8.7-33
4 DPHY PLL CONTROL
4.1 PMS SETTING SAMPLE FOR MIPI PLL
4.1.1 PMS setting
Write a value to PMS field in DSIM_PLLCTRL (0xECB0_004C) to set PMS value for DPHY PLL. Each P, M and S
resides in PMS [19:14] , PMS[13:4] and PMS[3:1] . Before Setting, PMS value please read the following:
1. Do not set the P or M value as zero, that is, setting the P(00000), M(0000000000) causes malfunction of the
PLL.
2. Select M and P considering stability and VCO range
3. Keep range of Fin_pll from 2.5 MHz to 5 MHz, by P code setting
Table 8.7-5 PMS and frequency constraint
Function Value Description
Fin Fin 3~200MHz Pll input frequency
Fin_pll Fin_pll 2.5 ~ 5 MHz Pfd input frequency
VCO_out (M*Fin)/P 500 ~ 1000 MHz VCO output frequency
Fout (M*Fin)/(P*2^S) 16 ~ 1000 MHz PLL output frequency
P[5:0] P 1 ~ 63 PMS[19:14]
M[9:0] M 100 ~ 1023 PMS[13:4]
S[2:0] 2^S 1, 2, 4, 8, 16, 32 PMS[3:1]
4.1.2 Sample for Fout 80 MHz
Followings are some example to set PMS value for Fout 80 MHz
Case 1 Case 2
Fin 24MHz 4MHz
Fin_pll 4MHz 4MHz
P[5:0] 6 1
M[9:0] 160 160
S[2:0] 8 8
VCO_out 640MHz 640MHz
Fout 80MHz 80MHz