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CS2100P-CZZ

Fractional-N Clock Multiplier

Cirrus Logic 

CS2100-OTP

6. PARAMETER DESCRIPTIONS

As mentioned in Section 5.1 on page 11, there are two different kinds of parameter configuration sets, Modal and

Global. These configuration sets, shown in Figure 16, can be programmed in the field using the CDK2000 or pre-

programmed at the factory. Please see “Programming Information” on page 24 for more details.

M[1:0] pins

Modal Configuration Set #0

Ratio 0

RModSel[1:0]

AuxOutSrc[1:0]

00

Modal Configuration Set #1

Ratio 1

RModSel[1:0]

AuxOutSrc[1:0]

01

Modal Configuration Set #2

Ratio 2

RModSel[1:0]

AuxOutSrc[1:0]

10

Modal Configuration Set #3

Ratio 3

RModSel[1:0]

AuxOutSrc[1:0]

11

Global Configuration Set

AuxLockCfg

RefClkDiv[1:0]

ClkOutUnl

LFRatioCfg

M2Config[2:0]

ClkIn_BW[2:0]

Figure 16. 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).

“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’.

20

DS841F1

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