ICS810001DK-21 REVISION B APRIL 13, 2010
6
2010 Integrated Device Technology, Inc.
ICS810001-21 Data Sheet
FEMTOCLOCK DUAL VCXO VIDEO PLL
Table 3D. CLK_SEL Function Table
Table 3E. MR Master Reset Function Table
Table 3F. FemtoCLock PLL Feedback Divider Function Table
Table 3G. PLL Output Divider Function Table
Table 3H. PLL BYPASS Logic Function Table
Input
Operation
CLK_SEL
0 (default)
Selects CLK0 as PLL reference input.
1
Selects CLK1 as PLL reference input.
Input
Operation
MR
0 (default)
Normal operation, internal dividers and the output Q are enabled.
1
Internal dividers are reset. Q output is in logic low state (with OE = 1).
Input
Operation
MF
0 (default)
Selects MF = 22. The 2nd stage PLL (FemtoClock. multiplies the output frequency of the VCXO-PLL by 22.
1
Selects MF = 24. The 2nd stage PLL (FemtoClock. multiplies the output frequency of the VCXO-PLL by 24.
Input
Operation
N1
N0
0 (default)
Output divider N = 4.
0
1
Output divider N = 8.
1
0
Output divider N = 12.
1
Output divider N = 18.
Input
Operation
nBP1
nBP0
00
VCXO-PLL mode: The input reference frequency is divided by the pre-divider P and is multiplied by the
VCXO-PLL. fOUT = (fREF ÷ P) * M.
01
Test mode: The input reference frequency is divided by the pre-divider P and the output divider N and
bypasses both PLLs. fOUT = fREF ÷ (P * N).
10
FemtoClock Mode: The input reference frequency is divided by the pre-divider P multiplied by the 2nd PLL
(FemtoClock, MF). The 1st PLL (VCXO-PLL, M) is bypassed. This mode does not support jitter
attenuatiion. fOUT = (fREF ÷ P) * MF ÷ N.
1 (default)
Dual PLL Mode: both PLLs are cascaded for jitter attenuation and frequency multiplication.
fOUT = (fREF ÷ P) * M * MF ÷ N.
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