CS2100-OTP Datasheet, PDF (21/28 Pages) Cirrus Logic – Fractional-N Clock Multiplier

CS2100-OTP
6. PARAMETER DESCRIPTIONS
As mentioned in Section 5.1 on page 10, there are two different kinds of parameter configuration sets, Modal and
Global. These configuration sets, shown in Figure 15, can be programmed in the field using the CDK2000 or pre-
programmed at the factory. Please see “Programming Information” on page 26 for more details.
M[1:0] pins
Modal Configuration Set #0
Ratio 0
RModSel[1:0]
AuxOutSrc[1:0]
AutoRmod
00
Modal Configuration Set #1
Ratio 1
RModSel[1:0]
AuxOutSrc[1:0]
AutoRmod
01
Modal Configuration Set #2
Ratio 2
RModSel[1:0]
AuxOutSrc[1:0]
AutoRmod
10
Modal Configuration Set #3
Ratio 3
RModSel[1:0]
AuxOutSrc[1:0]
AutoRmod
11
Global Configuration Set
ClkSkipEn
AuxLockCfg
RefClkDiv[1:0]
ClkOutUnl
LFRatioCfg
M2Config[2:0]
ClkIn_BW[2:0]
Figure 15. Parameter Configuration Sets
6.1 Modal Configuration Sets
There are four instances of each of these configuration parameters. Selection between the four stored sets
is made using the M[1:0] pins.
6.1.1
R-Mod Selection (RModSel[1:0])
Selects the R-Mod value, which is used as a factor in determining the PLL’s Fractional N.
RModSel[1:0]
00
01
10
11
Application:
R-Mod Selection
Right-shift R-value by 1 (÷ 2).
Right-shift R-value by 2 (÷ 4).
Right-shift R-value by 3 (÷ 8).
Right-shift R-value by 4 (÷ 16).
“Manual Ratio Modifier (R-Mod)” on page 15
Note: This parameter does not take affect unless M2 pin is high and the M2Config[2:0] global param-
eter is set to ‘011’.
DS841PP1
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