Altera IP Compiler for PCI Express - Manual (Page 125)

Chapter 5: IP Core Interfaces 5–39
Avalon-ST Interface
August 2014 Altera Corporation IP Compiler for PCI Express User Guide
f For a detailed description of the Avalon-MM protocol, refer to the Avalon
Memory-Mapped Interfaces chapter in the
Avalon Interface Specifications .
Power Management Signals
Table 5–19 shows the IP core’s power management signals. These signals are available
in configurations using the Avalon-ST interface or Descriptor/Data interface.
Table 5–18. Reconfiguration Block Signals (Hard IP Implementation)
Signal I/O Description
avs_pcie_reconfig_address[7:0] I A 8-bit address.
avs_pcie_reconfig_byteeenable[1:0] I Byte enables, currently unused.
avs_pcie_reconfig_chipselect I Chipselect.
avs_pcie_reconfig_write I Write signal.
avs_pcie_reconfig_writedata[15:0] I 16-bit write data bus.
avs_pcie_reconfig_waitrequest O
Asserted when unable to respond to a read or write request.
When asserted, the control signals to the slave remain constant.
waitrequest
can be asserted during idle cycles. An
Avalon-MM master may initiate a transaction when
waitrequest
is asserted.
avs_pcie_reconfig_read I Read signal.
avs_pcie_reconfig_readdata[15:0] O 16-bit read data bus.
avs_pcie_reconfig_readdatavalid O Read data valid signal.
avs_pcie_reconfig_clk I
Reconfiguration clock for the hard IP implementation. This
clock should not exceed 50MHz.
avs_pcie_reconfig_rstn I
Active-low Avalon-MM reset. Resets all of the dynamic
reconfiguration registers to their default values as described in
Table 13–1 on page 13–2 .
Table 5–19. Power Management Signals
Signal I/O Description
pme_to_cr I
Power management turn off control register.
Root port—When this signal is asserted, the root port sends the PME_turn_off message.
Endpoint—This signal is asserted to acknowledge the PME_turn_off message by sending
pme_to_ack
to the root port.
pme_to_sr O
Power management turn off status register.
Root port—This signal is asserted for 1 clock cycle when the root port receives the
pme_turn_off
acknowledge message.
Endpoint—This signal is asserted when the endpoint receives the PME_turn_off message
from the root port. For the soft IP implementation, it is asserted until pme_to_cr is
asserted. For the hard IP implementation, it is asserted for one cycle.
cfg_pmcsr[31:0] O
Power management capabilities register. This register is read-only and provides information
related to power management for a specific function. Refer to
Table 5–20 for additional
information. This signal only exists in soft IP implementation. In the hard IP
implementation, this information is accessed through the configuration interface. Refer to
“Configuration Space Signals—Hard IP Implementation” on page 5–29 .