参数资料
型号: LMK04031BEVAL/NOPB
厂商: National Semiconductor
文件页数: 30/65页
文件大小: 0K
描述: EVAL BOARD LMK04031BISQ
标准包装: 1
系列: PowerWise®
主要目的: 计时,多用途
嵌入式:
已用 IC / 零件: LMK04031
已供物品: 板,线缆,文档,软件
SNOSAZ8J – SEPTEMBER 2008 – REVISED SEPTEMBER 2011
PLL1 Reference Clock LOS Timeout Control
This register is used to tune the LOS timeout based upon the frequency of the reference clock input(s). The
register value controls the timeout setting for both CLKin0 and CLKin1. The value programmed in the
LOS_TIMEOUT register represents the minimum input frequency for which loss of signal can be detected. For
example, if the reference input frequency is 12.288 MHz, then either register values (0,0) or (0,1) will result in
valid loss of signal detection. If the reference input frequency is 1 MHz, then only the register value (0,0) will
result in valid detection of signal loss.
Table 14. Reference Clock LOS Timeout Control Bits
b1
b0
Corresponding Minimum Input Frequency
0
1 MHz
0
1
3.0 MHz
1
0
13 MHz
1
32 MHz
LOS Output Type Control
The output format of the LOS pins may be selected as active CMOS, open drain NMOS and open drain PMOS,
as shown in the following table.
Table 15. Loss of Signal (LOS) Output Pin Format Type
LOS_TYPE [1:0]
Functional Description
b1
b0
0
Reserved
0
1
NMOS open drain
1
0
PMOS open drain
1
Active CMOS
The LOS output signal is valid only when CLKin_SEL bits are set to either [1,0] or [1,1]. If the CLKin_SEL field is
programmed to either of the fixed inputs, [0,0] or [0,1], the LOS_TYPE bits should be set to [0,0].
Register 12
PLL1_N: PLL1_N Counter
The size of the PLL1_N counter is 12 bits. This counter will support a maximum divide ratio of 4095 and
minimum divide ratio of 1. The 12 bit resolution is sufficient to support minimum phase detector frequency
resolution of approximately 50 kHz when the VCXO frequency is 200 MHz.
For a 200 MHz external VCXO, the minimum phase detector rate will be PDmin = 200 MHz/4095 = 48.84 kHz
Table 16. PLL1_N Counter Values
N [17:0]
VALUE
b11
b10
...
b6
b5
b4
b3
b2
b1
b0
0
Not Valid
0
1
0
1
0
2
.
...
1
4095
36
Copyright 2008–2011, Texas Instruments Incorporated
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