Clock Configuration
MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
7-7
7.3 Clock Configuration
MODCK[1–2]
and the MODCK[3–5] bits of the Hard Reset Configuration Word (HRCW),
discussed in Section 5.6.1, map the MSC8113 clocks to one of the valid 27 configuration mode
options. Each option determines the
CLKIN
, BUSES_CLOCK, and CORES_CLOCK frequency
ratios. The
MODCK
inputs define the SPLL input clock division factor, feedback clock division
factor and output clock division factor. In addition, the
MODCK inputs
define the BUSES_CLOCK
division factor.
MODCK[1–2]
are sampled at the deassertion of the power-on reset signal
(
PORESET)
. The other three mode bits MODCK[3–5] are initialized during the reset
configuration sequence. The clock configuration changes only after
PORESET
is asserted. You
can select a configuration to provide the required frequencies for an existing clock or define the
clock setting to achieve the performance required.
The following five factors can be configured (see Section 7.4, Clocks Programming Model, on
page 7-10):
SPLL input clock division factor (PLLRDF)
SPLL feedback clock division factor (PLLFDF)
SPLL output clock division factor (PLLODF)
SPLL loop filter tuning factor (PLLTP)
BUS post-division factor (BUSDF)
Table 7-1 lists the possible configuration mode options.The following formulas explicitly
calculate the BUSES_CLOCK and CORES_CLOCK frequencies:
F
REF
F
CLKIN
PLLRDF
-----------------------
=
F
CORE
1
2
---
F
VCO
PLLODF
------------------------
×
F
CLKIN
PLLRDF
-----------------------
PLLFDF
×
BUSDF
×
=
=
F
VCO
2
F
CLKIN
PLLRDF
-----------------------
×
PLLFDF
×
PLLODF
BUSDF
×
×
=
F
BUS
F
CORE
BUSDF
--------------------
F
CLKIN
PLLRDF
-----------------------
PLLFDF
×
=
=
F
CLKOUT
F
BUS
F
CLKIN
PLLRDF
-----------------------
PLLFDF
×
=
=
Содержание MSC8113
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