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PI2EQX5804CNJE Datasheet(PDF) 6 Page - Pericom Semiconductor Corporation |
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PI2EQX5804CNJE Datasheet(HTML) 6 Page - Pericom Semiconductor Corporation |
6 / 23 page 6 PS8926B 06/08/09 PI2EQX5804C 5.0Gbps 4-Lane PCIe® 2.0 ReDriver™ with Equalization & Emphasis Output Swing Control S1_[A:B] S0_[A:B] Swing (Diff. VPP) 001V 0 1 0.5V 1 0 0.7V 1 1 0.9V Output De-emphasis Adjustment D2_[A:B] D1_[A:B] D0_[A:B] De-emphasis 0000dB 0 0 1 -2.5dB 0 1 0 -3.5dB 0 1 1 -4.5dB 1 0 0 -5.5dB 1 0 1 -6.5dB 1 1 0 -7.5dB 1 1 1 -8.5dB Emphasis settings are determined by the state of the DEx_y input pins and configuration registers, as shown in the Output De-emphasis table below. De-Emphasis is selected as the default power-on mode in following the PCI Express specification, but can be changed to Pre-emphasis via reprogramming the Loopback and Empha- sis Control register using the I2C interface. Input Level Detect An input level detect and output squelch function is provided on each channel to eliminate re-transmission of input noise. A continuous signal level below the Vth- threshold causes the output driver to go to a high-impre- dance state, so that both the positive and negative output signal are pulled to VDD by the internal pull-up resis- tors. This feature supports the L0s PCI Express Electrical Idle state. Receiver Detect Automatic Receiver Detection is a feature that can set the number of active channels. By sensing the presence of a load device on the output, the channel can be automatically enabled for operation. This allows the PI2EQX5804C to config- ure itself properly depending on the devices it is communicating with, whether it is a 4-lane, 3-lane, 2-lane or just 1-lane device or adapter card. Receiver Detect is enabled by the RXD_A, or RXD_B pins, or alternatively via I2C programming. When RXD_A or RXD_B is set to low, then the Receiver Detect operation for that group of channel is disabled, and those channels go directly to 50-Ohm input termination to ground and 50-Ohm output termination to VDD (for a valid differential channel input level) or to 2K-Ohm (if the signal level is less than the threshold level). (Continued) 09-0001 |
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