Altera IP Compiler for PCI Express - Manual (Page 168)

7–4 Chapter 7: Reset and Clocks
Reset Soft IP Implementation
IP Compiler for PCI Express User Guide August 2014 Altera Corporation
Reset Soft IP Implementation
Figure 7–3 shows the global reset signals for ×1 and ×4 endpoints in the soft IP
implementation. To use this variant, you must design the logic to implement reset and
calibration. For designs that use the internal ALTGX transceiver, the PIPE interface is
transparent. You can use the reset sequence provided for the hard IP implementation
in the <variant>_rs_hip.v or .vhd IP core as a reference in designing your own circuit.
In addition, to understand the domain of each reset signal, refer to
“Reset Details” on
page 5–25 .
Figure 7–3. Global Reset Signals for ×1 and ×4 Endpoints in the Soft IP Implementation
Notes to Figure 7–3 :
(1) The Gen1 ×8 does not include the crst signal and rstn replaces srst in the soft IP implementation.
(2) The dlup_exit signal should cause the application to assert srst, but not crst.
(3) gxb_powerdown stops the generation of core_clk_out for hard IP implementations and clk125_out for soft IP implementations.
(4) The rx_freqlocked signal is only used in Gen2 ×4 and Gen2 ×8 IP Compiler for PCI Express variations.
<variant>.v or .vhd
<variant>_core.v or .vhd
<variant> _serdes.v or .vhd
SERDES Reset Controller
srst
crst
altpcie_hip_pipen1b.v or .vhd
Other Power
On Reset
perst#
l2_exit
tx_digitalreset
rx_analogreset
rx_digitalreset
tx_digitalreset
rx_analogreset
rx_digitalreset
npor
pll_locked
rx_pll_locked
pll_powerdown
gxb_powerdown
rx_freqlocked
Note (1)
Note (4)
Note (1)
Note (2)
Note (3)
rx_freqlocked
pll_locked
rx_pll_locked
hotrst_exit
dlup_exit
dl_ltssm[4:0]
Reset Synchronization
Circuitry from Design
Example