KS8695P-EVAL Micrel Inc, KS8695P-EVAL Datasheet - Page 19

• Manufacturer Part Number: KS8695P-EVAL
• Description: BOARD EVAL EXPERIMENT KS8695P
• Manufacturer: Micrel Inc

Specifications of KS8695P-EVAL

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 576-1002

System Clock
The clock to the KS8695P is supplied by either a 25MHz ±50ppm crystal or by an oscillator. If an oscillator is used, it must
be connected to the XCLK1 input (pin E1) on the KS8695P. If a crystal is used, it must be connected with a circuit similar to
the one shown below. The 25MHz input clock is used by an internal PLL to generate the programmable SDOCLK. SDOCLK
is the system clock and can be programmed from 25MHz to 125MHz using the system clock and bus control register at
offset 0x0004. The CPUCLKSEL strap-in option on pin M15 needs to be pulled low for normal operation. SDICLK is used
to register the data read from the SDRAM back into the KS8695P. The system designer must ensure that SDRAM timing is
met when routing SDOCLK back to SDICLK.
August 2005
KS8695P
1k
M15
URTSN/
CPUCLKSEL
Figure 6. Typical Clock Circuit
22pF
E1
XCLK1
KS8695P
25MHz
Xtal
XCLK2
19
E2
22pF
SDOCLK
SDICLK
U7
T7
25MHz to 125MHz
To System
M9999-081805
Micrel