参数资料
型号: KSZ8695PX-EVAL
厂商: Micrel Inc
文件页数: 19/40页
文件大小: 0K
描述: KIT EVAL KSZ8695PX EXPERIMENT
标准包装: 1
主要目的: 接口,以太网控制器(PHY 和 MAC)
嵌入式:
已用 IC / 零件: KSZ8695PX
主要属性: 单芯片网关解决方案
已供物品:
相关产品: 576-1024-ND - IC SWITCH 10/100 1PORT 289PBGA
其它名称: 576-3876
KSZ8695PX-EVAL-ND
KS8695PX
Micrel
System Clock
The clock to the KS8695PX 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 KS8695PX. 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. SDO-
CLK 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 KS8695PX. The system designer must ensure that SDRAM timing
is met when routing SDOCLK back to SDICLK.
KS8695PX
SDICLK
T7
1k ?
M15
URTSN/
CPUCLKSEL
XCLK1
SDOCLK
XCLK2
U7
To System
25MHz to 125MHz
E1
22pF
25MHz
Xtal
E2
22pF
Figure 6. Typical Clock Circuit
September 2005
19
M9999-091605
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