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DS50PCI402SQE Datasheet(PDF) 8 Page - Texas Instruments |
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DS50PCI402SQE Datasheet(HTML) 8 Page - Texas Instruments |
8 / 38 page 0 50 100 150 200 250 0 10k 20k 30k 40k 50k 60k 70k 80k SD_TH RESISTOR VALUE (:) VDD = 2.5V TA = 25°C DS50PCI402 SNLS320H – APRIL 2010 – REVISED MARCH 2013 www.ti.com Table 6. Idle Control (3–Level Input) TXIDLEA/B Function 0 This state is for lossy media, dedicated Idle threshold detect circuit disabled, output follows input based on EQ settings. Idle state not ensured. Float Float enables automatic idle detection. Idle on the input is passed to the output. This is the recommended default state. Output driven to Idle if diff input signal less than value set by SD_TH pin. 1 Manual override, output forced to Idle. Diff inputs are ignored. Table 7. Receiver Electrical Idle Detect Threshold Adjust (Analog input - Connect Resistor to GND or Float) SD_TH resistor value ( Ω) (connect from pin to GND)(1) Typical Receiver Electrical Idle Detect Threshold (DIFF p-p) Float (no resistor required) 130mV (default condition) 0 225mV 80K 20mV (1) SD_TH resistor value can be set from 0 through 80K Ohms to achieve desired idle detect threshold, see Figure 1. 8K Ohm is approx 130mV. Figure 1. Typical Idle threshold vs SD_TH resistor value Receiver Detection The Rx detection process is a feature that can set the number of active channels on the DS50PCI402. By sensing the presence of a valid PCIe load on the output, the channel can be automatically enabled for operation. This allows the DS50PCI402 to configure inself to the proper lane width, whether it is a 4-lane, 2-lane, or 1-lane PCIe link. Automatic Rx Detection is enabled by a combination of PRSNT# and ENRXDET inputs. When these inputs are set low, Automatic Rx Detection is enabled, cycling of the PRSNT# pin will reset the Rx detection circuitry, initiating a new receiver detection sequence. Pulling the ENRXDET input to logic 1, allows for manual control of the input termination. The table below summarizes control pin and receiver detect operation for the DS50PCI402. 8 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: DS50PCI402 |
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