Altera Stratix V Avalon-MM Interface for PCIe Solutions Bedienungsanleitung Seite 105

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Reset and Clocks
6
2014.12.15
UG-01097_avmm
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Stratix V Hard IP for PCI Express IP Core includes both a soft reset controller and a hard reset controller.
Software selects the appropriate reset controller depending on the configuration you specify. Both reset
controllers reset the IP core and provide sample reset logic in the example design. The figure below
provides a simplified view of the logic that implements both reset controllers.
Table 6-1: Use of Hard and Soft Reset Controllers
Reset Controller Used Description
Hard Reset Controller pin_perst from the input pin of the FPGA resets the Hard IP for PCI Express
IP Core. app_rstn which resets the Application Layer logic is derived from
reset_status and pld_clk_inuse, which are outputs of the core. This reset
controller is supported for Gen 1 production devices.
Soft Reset Controller Either pin_perst from the input pin of the FPGA or npor which is derived
from pin_perst or local_rstn can reset the Hard IP for PCI Express IP
Core. Application Layer logic generates the optional local_rstn signal. app_
rstn which resets the Application Layer logic is derived from npor.
This reset controller is supported for Gen2 and Gen3 production devices.
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