CDK2000 Cirrus Logic, Inc., CDK2000 Datasheet - Page 17

• Manufacturer Part Number: CDK2000
• Description: Fractional-n Clock Multiplier with Internal LCO
• Manufacturer: Cirrus Logic, Inc.

DS844F1
5.7.2
5.7.2.1
5.7.2.2
5.7.2.3
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.
option in more detail.
M2 Configured as Output Disable
M2 Configured as R-Mod Enable
M2 Configured as AuxOutSrc Override
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.
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.
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] .
M2 pin
Figure 13
summarizes the available options and the following sections will describe each
M2Config[2:0] global parameter
Figure 13. M2 Mapping Options
000
001
010
011
100
101
110
111
Disable CLK_OUT pin
Disable AUX_OUT pin
Disable CLK_OUT and AUX_OUT pins
RModSel[1:0] Modal Parameter Enable
Reserved
Reserved
Reserved
Force AuxOutSel[1:0] = 10 (PLL Clock Out)
CS2300-OTP
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