Texas Instruments DS320PR412-421EVM, User Manual

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Table 2-5. Rx Detect Control Pin Settings
PD PIN LEVEL RX_DET PIN LEVEL DESCRIPTION
L L0
PCI Express RX detection state machine is disabled.
Recommended for non-PCI Express use cases. Inputs
are always 50 Ω.
L L1 Outputs poll until three consecutive valid detections.
L L2 Outputs poll until two consecutive valid detections.
L L3 Reserved.
L L4
TX polls every ~150us until valid termination is
detected. Recommended Default setting for PCIe.
H X Manual reset, inputs are Hi-Z
2.6 Redriver-Mux DC Gain Control
When operating in Pin Mode, the GAIN/SDA pin can be used to set the overall datapath DC (low frequency) gain
of the DS320PR412, DS320PR421, SN75LVPE5412 and SN75LVPE5421 as shown in
Table 2-6 . Please refer to
data sheet for actual Gain values.
Table 2-6. GAIN Control
GAIN/SDA PIN
LEVEL
GAIN SETTING
L0 Refer to data sheet
L1 Refer to data sheet
L2 Refer to data sheet
L3 Refer to data sheet
L4 0 dB (Recommended for most use cases)
The DC gain of each channel of each device can also be set by writing to SMBus / I2C registers in Slave or
Master Modes.
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6 DS320PR412-421EVM User's Guide SNLU301 – NOVEMBER 2021
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