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PCI Express

Question asked by Yosvani Ledo on Sep 29, 2016
Latest reply on Oct 12, 2016 by ufedor

1. For PCI exp using lynx_pciexp_tx_main Model, which amplitude will correspond to the model listed

Sets the peak value for output swing of transmitters and the amount of transmit equalization for lane A.

Transmit equalization selection bus for lane A.

If register field SRDSCR3[21:23] = 000, then the equalization definitions are:

000 No equalization

001 1.09x relative amplitude

010 1.2x relative amplitude

011 1.33x relative amplitude

100 1.5x relative amplitude

101 1.71x relative amplitude

110 2.0x relative amplitude

111 Reserved

If register field SRDSCR3[21:23] = 110, then the equalization definitions are:

000 No equalization

001 1.2x relative amplitude

010 1.5x relative amplitude

011 2.0x relative amplitude

100 Reserved

101 Reserved

110 Reserved

111 Reserved

Recommended setting per protocol:

• SATA: don’t care

• PCI Express: 100

• SGMII: 100

 

2. This is for PCI express, manual mentioned that AC coupling could be enable or disable, since AC caps places external to the chip at the driver, could disable the internal ones?

Used to set on-chip AC coupling in the receiver in lane A.

0 Disable on-chip AC coupling

1 Enable on-chip AC coupling

Recommended setting per protocol:

• SATA: 1

• PCI Express: 1

• SGMII: 1

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