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CY28346ZC-2 参数 Datasheet PDF下载

CY28346ZC-2图片预览
型号: CY28346ZC-2
PDF下载: 下载PDF文件 查看货源
内容描述: 时钟合成器,差分CPU输出 [Clock Synthesizer with Differential CPU Outputs]
分类和应用: 晶体外围集成电路光电二极管时钟
文件页数/大小: 19 页 / 169 K
品牌: SPECTRALINEAR [ SPECTRALINEAR INC ]
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CY28346-2  
Byte 0: CPU Clock Register  
Bit @Pup Name  
Description  
7
0
Spread Spectrum Enable, 0 = Spread Off, 1 = Spread On. This is a Read and Write control bit.  
CPU clock Power-down Mode Select.  
0 = Drive CPUT(0:2) to 4 or 6 IREF and drive CPUC(0:2) to low when PD# is asserted LOW.  
1 = Three-state all CPU outputs. This is only applicable when PD# is LOW. It is not applicable to  
CPU_STP#.  
6
0
3V66_1/VCH 3V66_1/VCH frequency Select, 0 = 66M selected, 1 = 48M selected  
This is a Read and Write control bit.  
5
4
3
0
Pin 53 CPUT,CPUC CPU_STP#. Reflects the current value of the external CPU_STP# (pin 53) This bit is Read-only.  
PCI  
Reflects the current value of the internal PCI_STP# function when read. Internally PCI_STP# is  
a logical AND function of the internal SMBus register bit and the external PCI_STP# pin.  
Pin 34  
2
1
0
Pin 40  
Pin 55  
Pin 54  
Frequency Select Bit 2. Reflects the value of SEL2 (pin 40). This bit is Read-only.  
Frequency Select Bit 1. Reflects the value of SEL1 (pin 55). This bit is Read-only.  
Frequency Select Bit 0. Reflects the value of SEL0 (pin 54). This bit is Read-only.  
Byte 1: CPU Clock Register  
Bit @Pup  
Name  
Description  
7
Pin 43  
MULT0  
MULT0 (Pin 43) Value. This bit is Read-only.  
Controls functionality of CPUT/C(0:2) outputs when CPU_STP# is asserted. 0 = Drive CPUT(0:2) to  
4 or 6 IREF and drive CPUC(0:2) to low when CPU_STP# asserted LOW. 1 = Three-state all CPU  
outputs. This bit will override Byte0, Bit6 such that even if it is a 0, when PD# goes low the CPU outputs  
will be three-stated.  
6
0
CPU_STP#  
Controls CPU2 functionality when CPU_STP# is asserted LOW  
1 = Free Running, 0 = Stopped LOW with CPU_STP# asserted LOW  
This is a Read and Write control bit.  
CPUT2  
CPUC2  
5
4
3
0
0
0
Controls CPU1 functionality when CPU_STP# is asserted LOW  
1 = Free Running, 0 = Stopped LOW with CPU_STP# asserted LOW  
This is a Read and Write control bit.  
CPUT1  
CPUC1  
Controls CPUT0 functionality when CPU_STP# is asserted LOW  
1 = Free Running, 0 = Stopped LOW with CPU_STP# asserted LOW  
This is a Read and Write control bit.  
CPUT0  
CPUC0  
CPUT2 CPUT/C2 Output Control, 1 = enabled, 0 = disable HIGH and CPUC2 disables LOW  
CPUC2 This is a Read and Write control bit.  
2
1
0
1
1
1
CPUT1 CPUT/C1 Output Control, 1 = enabled, 0 = disable HIGH and CPUC1 disables LOW  
CPUC1 This is a Read and Write control bit.  
CPUT0 CPUT/C0 Output Control, 1 = enabled, 0 = disable HIGH and CPUC0 disables LOW  
CPUC0 This is a Read and Write control bit.  
Byte 2: PCI Clock Control Register (all bits are read and write functional)  
Bit  
7
@Pup  
Name  
REF  
Description  
0
1
1
1
1
1
1
1
REF Output Control. 0 = high strength, 1 = low strength  
PCI6 Output Control. 1 = enabled, 0 = forced LOW  
PCI5 Output Control. 1 = enabled, 0 = forced LOW  
PCI4 Output Control. 1 = enabled, 0 = forced LOW  
PCI3 Output Control. 1 = enabled, 0 = forced LOW  
PCI2 Output Control. 1 = enabled, 0 = forced LOW  
PCI1 Output Control. 1 = enabled, 0 = forced LOW  
PCI0 Output Control. 1 = enabled, 0 = forced LOW  
6
PCI6  
PCI5  
PCI4  
PCI3  
PCI2  
PCI1  
PCI0  
5
4
3
2
1
0
Rev 1.0,November 20, 2006  
Page 4 of 19  
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