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CY28372OXC Datasheet(PDF) 2 Page - SpectraLinear Inc |
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CY28372OXC Datasheet(HTML) 2 Page - SpectraLinear Inc |
2 / 17 page CY28372 Rev 1.0, November 20, 2006 Page 2 of 17 Pin Description Pin #. Name Type Description 6XIN I Crystal Connection or External Reference Frequency Input. This pin has dual functions. It can be used as an external 14.318-MHz crystal connection or as an external reference frequency input. 7XOUT O Crystal Connection. Connection for an external 14.318-MHz crystal. If using an external reference, this pin must be left unconnected. 4REF2 O Reference Clock. 14.31818 reference outputs. 2, 3 REF[0:1]/ FS[0:1] O Reference Clock. 14.31818 reference outputs. I Frequency Select. Sampled upon power-on to determine device operating frequency. 14, 15 PCIF[0:1]/ FS[2:3] O Free-running PCI. Independent of PCI_STP#. I Frequency Select. Sampled upon power-on to determine device operating frequency. 16, 17, 20, 21, 22, 23 PCI [0:5] O PCI Clock. 12 PCI_STP# I PCI Stop. Stops all PCI clocks 40 39 CPUT0 CPUC0 O Differential CPU Outputs. 43 CPUT1 O “True” Clock of Differential CPU Outputs. For chipset host bus 44 CPU_STP# I CPU Stop. Stops all CPU clocks 9, 10 ZCLK[0:1] O MuTIOL Clock Outputs. 46, 47 IOAPIC[0:1] O IOAPIC. 2.5 V clock outputs 27 48MHz O 48 MHz Clock. USB clock outputs 26 24_48MHz O 24 MHz or 48 MHz Clock. Selectable SIO clock outputs. Default output frequency is 24 MHz, but can be configured for 48 MHz through I2C. 31, 30 AGP[0:1] O AGP Clock. 34 SDATA I/O I2C Data. 5v tolerant 35 SCLK I I2C Clock.5v tolerant 33 PD# I Power-down Control. Turns off all clock outputs and shuts down device 36 VDDA PWR 3.3V Analog Power/Ground. Power supply for core logic, PLL circuitry 37 GNDA PWR 1, 5, 8, 11, 13, 18, 19, 24, 25, 28, 29, 32 VDD_REF, GND_REF, GND_Z, VDD_Z, VDD_PCI, GND_PCI, GND_48, VDD_48, VDD_AGP, GND_AGP PWR 3.3V Power and Ground. Power supply for respective output buffers. 38, 41, 42 48, 45 VDD_CPU, GND_CPU, VDD_APIC, GND_APIC PWR 2.5V Power and Ground. Power supply for respective output buffers. |
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