Altera IP Compiler for PCI Express User Manual
Page 46
3–10
Chapter 3: Parameter Settings
IP Core Parameters
IP Compiler for PCI Express User Guide
August 2014
Altera Corporation
PHY interface
16-bit SDR,
16-bit SDR w/TxClk,
8-bit DDR,
8-bit DDR w/TxClk,
8-bit DDR/SDR
w/TXClk,
8 bit SDR,
8-bit SDR w/TxClk,
serial
Selects the specific type of external PHY interface based on the interface
datapath width and clocking mode. Refer to
for additional detail on specific PHY modes.
The PHY interface setting only applies to the soft IP implementation.
Configure transceiver
block
Clicking this button brings up the transceiver parameter editor, allowing
you to access a much greater subset of the transceiver parameters than
was available in earlier releases. The parameters that you can access are
different for the soft and hard IP versions of the IP Compiler for PCI
Express and may change from release to release.
For Arria II GX, Cyclone IV GX, Stratix II GX, and Stratix IV GX
transceivers, refer to the “Protocol Settings for PCI Express (PIPE)” in
an explanation of these settings.
Lanes
×1, ×2, ×4, ×8
Specifies the maximum number of lanes supported. The ×8 soft IP
configuration is only supported for Stratix II GX devices. For information
about ×8 support in hard IP configurations, refer to
.
Xcvr ref_clk
PHY pclk
100 MHz, 125 MHz
For Arria II GX, Cyclone IV GX, HardCopy IV GX, and Stratix IV GX, you
can select either a 100 MHz or 125 MHz reference clock for Gen1
operation; Gen2 requires a 100 MHz clock. The Arria GX and
Stratix II GX devices require a 100 MHz clock. If you use a PIPE
interface (and the PHY type is not Arria GX, Arria II GX, Cyclone IV GX,
HardCopy IV GX, Stratix II GX, or Stratix IV GX) the refclk is not
required.
For Custom and TI X101100 PHYs, the PHY pclk frequency is 125 MHz.
For the NXP PX1011A PHY, the pclk value is 250 MHz.
Application Interface
64-bit Avalon-ST,
128-bit Avalon-ST,
Descriptor/Data,
Avalon-MM
Specifies the interface between the PCI Express transaction layer and the
application layer. When using the parameter editor, this parameter can
be set to Avalon-ST or Descriptor/Data. Altera recommends the Avalon-
ST option for all new designs. 128-bit Avalon-ST is only available when
using the hard IP implementation.
Port type
Native Endpoint
Legacy Endpoint
Root Port
Specifies the port type. Altera recommends Native Endpoint for all new
endpoint designs. Select Legacy Endpoint only when you require I/O
transaction support for compatibility. The Qsys design flow only
supports Native Endpoint and the Avalon-MM interface to the user
application. The Root Port option is available in the hard IP
implementations.
The endpoint stores parameters in the Type 0 configuration space which
is outlined in
. The root port stores parameters in
the Type 1 configuration space which is outlined in
.
PCI Express version
1.0A, 1.1, 2.0
Selects the PCI Express specification with which the variation is
compatible. Depending on the device that you select, the IP Compiler for
PCI Express hard IP implementation supports PCI Express versions 1.1
and 2.0. The IP Compiler for PCI Express soft IP implementation
supports PCI Express versions 1.0a and 1.1
Table 3–9. System Settings Parameters (Part 3 of 4)
Parameter
Value
Description