Cirrus-logic CS2300-OTP User Manual download pdf (Page 19)

CS2300-OTP

DS844F2 19

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 14, can be programmed in the field using the CDK2000 or pre-

programmed at the factory. Please see “Programming Information” on page 23 for more details.

Figure 14. 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.

Note: This parameter does not take affect unless M2 pin is high and the M2Config[2:0] global param-

eter is set to ‘011’.

RModSel[1:0] R-Mod Selection

00 Right-shift R-value by 1 (÷ 2).

01 Right-shift R-value by 2 (÷ 4).

10 Right-shift R-value by 3 (÷ 8).

11 Right-shift R-value by 4 (÷ 16).

Application: “Ratio Modifier (R-Mod)” on page 13

M[1:0] pins

Modal Configuration Set #0

RModSel[1:0] AuxOutSrc[1:0]

Modal Configuration Set #1

Ratio 1 RModSel[1:0] AuxOutSrc[1:0]

Modal Configuration Set #2

Ratio 2 RModSel[1:0] AuxOutSrc[1:0]

Modal Configuration Set #3

Ratio 3 RModSel[1:0] AuxOutSrc[1:0]

Global Configuration Set

ClkOutUnlAuxLockCfg LFRatioCfg M2Config[2:0]

Ratio 0

Digital/PLL Core

ClkIn_BW[2:0]

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 25 26

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Cirrus-logic CS2300-OTP User Manual Page 19