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XRT8001IP Datasheet(PDF) 4 Page - Exar Corporation |
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XRT8001IP Datasheet(HTML) 4 Page - Exar Corporation |
4 / 48 page XRT8001 4 Rev. 1.01 PIN DESCRIPTION (CONT'D) Pin # Name Type Description 8 MSB I Master/Slave Mode Select Input - Setting this input pin “HIGH” configures the XRT8001 to operate in the “MASTER” Mode. Conversely, setting this input pin “LOW” configures the XRT8001 to operate in the “SLAVE” Mode. 9 GND - Analog Ground 10 VCC - Analog Power Supply 11 LOCKDET O Lock Detect Output - This output indicates whether or not the “selected” internal PLL(s) are “in-lock” or are “out-of-lock”. By default, this output pin is “high” when both PLLs are in-lock” and will go toggle “low” if either one of the PLLs is “out-of-lock”. However, the XRT8001 also permits the user to configure this output pin to reflect the state of any one of the PLLs within the chip. (See Table 3.) 12 VCC - Digital Power Supply 13 CLK2 O Clock Output 2 - The XRT8001 will drive the desired “synthesized” signal via this output pin. This output signal will have a 50+5% duty cycle. Note: This output pin is tri-stated unless the “CLK1EN” bit-field (within Command Register CR4) has been set to “1”. 14 GND - Digital Ground 15 VCC - Digital Power Supply 16 SDI I Microprocessor Serial Interface – Serial Data Input Whenever, the user wishes to read or write data into the Command Registers, over the Microprocessor Serial Interface, the user is expected to apply the “Read/Write” bit, the Address Values (of the Command Registers) and Data Value to be written (during “Write” Operations) to this pin. This input will be sampled on the rising edge of the SCLK pin (pin 18). 17 CS I Microprocessor Serial Interface – Chip Select Input: The Local Microprocessor must assert this pin (e.g., set it to “0”) in order to enable communication with the XRT8001 via the Microprocessor Serial Interface. Note: This pin is internally pulled “high”. 18 SCLK I Microprocessor Serial Interface-Clock Signal This signal will be used to sample the data, on the SDI pin, on the rising edge of this signal. Additionally, during “Read” operations, the Microprocessor Serial Interface will update the SDO output on the falling edge of this signal. |
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