CS2100P-CZZ 데이터 시트보기 (PDF) - Cirrus Logic

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CS2100P-CZZ

Fractional-N Clock Multiplier

Cirrus Logic 

5.7.2

CS2100-OTP

M2 Mode Pin Functionality

M2 usage is mapped to one of the optional special functions via the M2Config[2:0] global parameter. De-

pending on what M2 is mapped to, it will either act as an output enable/disable pin or override certain mod-

al parameters. Figure 15 summarizes the available options and the following sections will describe each

option in more detail.

M2Config[2:0] global parameter

5.7.2.1

5.7.2.2

5.7.2.3

M2 pin

000

Disable CLK_OUT pin

001

Disable AUX_OUT pin

010

Disable CLK_OUT and AUX_OUT pins

011

RModSel[1:0] Modal Parameter Enable

100

Reserved

101

Reserved

110

Reserved

111

Force AuxOutSel[1:0] = 10 (PLL Clock Out)

Figure 15. M2 Mapping Options

M2 Configured as Output Disable

If M2Config[2:0] is set to either ‘000’, ‘001’, or ‘010’, M2 becomes an output disable pin for one or

both output pins. If M2 is driven ‘low’, the corresponding output(s) will be enabled, if M2 is driven

‘high’, the corresponding output(s) will be disabled.

M2 Configured as R-Mod Enable

If M2Config[2:0] is set to ‘011’, M2 becomes the R-Mod enable pin. It should be noted that M2 is

the only way to enable R-Mod. Even though the RModSel[1:0] modal parameter can be set arbi-

trarily for each configuration set, it will not take effect unless enabled via M2. If M2 is driven ‘low’,

R-Mod will be disabled, if M2 is driven ‘high’ R-Mod will be enabled.

M2 Configured as AuxOutSrc Override

If M2Config[2:0] is set to ‘111’, M2 when driven ‘high’ will override the AuxOutSrc[1:0] modal pa-

rameter and force the AUX_OUT source to PLL Clock Output. When M2 is driven ‘low’, AUX_OUT

will function according to AuxOutSrc[1:0].

18

DS841F1

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