Altera IP Compiler for PCI Express - Manual (Page 110)

5–24 Chapter 5: IP Core Interfaces
Avalon-ST Interface
IP Compiler for PCI Express User Guide August 2014 Altera Corporation
Reset and Link Training Signals
Table 5–7 describes the reset signals available in configurations using the Avalon-ST
interface or descriptor/data interface.
Table 5–7. Reset and Link Training Signals (Part 1 of 2)
Signal I/O Description
<variant>_plus.v or .vhd
pcie_rstn I
pcie_rstn directly resets all sticky IP Compiler for PCI Express configuration registers.
Sticky registers are those registers that fail to reset in L2 low power mode or upon a
fundamental reset. This is an asynchronous reset.
local_rstn I
reset_n is the system-wide reset which resets all IP Compiler for PCI Express circuitry not
affected by pcie_rstn. This is an asynchronous reset.
Both <variant>_plus.v or .vhd and <variant>.v or .vhd
suc_spd_neg O Indicates successful speed negotiation to Gen2 when asserted.
ltssm[4:0] O
LTSSM state: The LTSSM state machine encoding defines the following states:
■ 00000: detect.quiet
■ 00001: detect.active
■ 00010: polling.active
■ 00011: polling.compliance
■ 00100: polling.configuration
■ 00101: polling.speed
■ 00110: config.linkwidthstart
■ 00111: config.linkaccept
■ 01000: config.lanenumaccept
■ 01001: config.lanenumwait
■ 01010: config.complete
■ 01011: config.idle
■ 01100: recovery.rcvlock
■ 01101: recovery.rcvconfig
■ 01110: recovery.idle
■ 01111: L0
■ 10000: disable
■ 10001: loopback.entry
■ 10010: loopback.active
■ 10011: loopback.exit
■ 10100: hot.reset
■ 10110: L1.entry
■ 10111: L1.idle
■ 11000: L2.idle
■ 11001: L2.transmit.wake
■ 11010: speed.recovery
reset_status O
Reset Status signal. When asserted, this signal indicates that the IP core is in reset. This
signal is only available in the hard IP implementation. When the npor signal asserts,
reset_status
is reset to zero. The reset_status signal is synchronous to the pld_clk
and is deasserted only when the pld_clk is good.
<variant>.v or .vhd, only