
Chapter 5: IP Core Interfaces 5–31
Avalon-ST Interface
August 2014 Altera Corporation IP Compiler for PCI Express User Guide
Configuration Space Register Access Timing
Figure 5–28 illustrates the timing of the
tl_cfg_ctl
interface for the Arria II GX,
Cyclone IV GX, HardCopy IV, and Stratix IV GX devices when using a 64-bit
interface.
hpg_ctrler
5I
The
hpg_ctrler
signals are only available in root port mode and when the Enable slot
capability parameter is set to On. Refer to the Enable slot capability and Slot capability
register parameters in Table 3–11 on page 3–13. For endpoint variations the
hpg_ctrler
input should be hardwired to 0's. The bits have the following meanings:
[0]
Attention button pressed. This signal should be asserted when the attention
button is pressed. If no attention button exists for the slot, this bit should be
hardwired to 0, and the
Attention Button Present
bit (bit[0]) in the Slot
capability register parameter should be set to 0.
[1]
Presence detect. This signal should be asserted when a presence detect change is
detected in the slot via a presence detect circuit.
[2]
Manually-operated retention latch (MRL) sensor changed. This signal should be
asserted when an MRL sensor indicates that the MRL is Open. If an MRL Sensor
does not exist for the slot, this bit should be hardwired to 0, and the
MRL Sensor
Present
bit (bit[2]) in the Slot capability register parameter should be set to 0.
[3]
Power fault detected. This signal should be asserted when the power controller
detects a power fault for this slot. If there is not a power controller for this slot
this bit should be hardwired to 0, and the
Power Controller Present
bit
(bit[1]) in the Slot capability register parameter should be set to 0.
[4]
Power controller status. This signal is used to set the command completed bit of
the
Slot
Status
register. Power controller status is equal to the power controller
control signal. If there is not a power controller for this slot, this bit should be
hardwired to 0 and the
Power Controller Present
bit (bit[1]) in the Slot
capability register parameter should be set to 0.
Table 5–13. Configuration Space Signals (Hard IP Implementation) (Part 2 of 2)
Signal Width Dir Description
Figure 5–28. tl_cfg_ctl Timing (Hard IP Implementation)
core_clk
pld_clk 64-bit mode
tl_cfg_ctl[31:0]
tl_cfg_add[3:0]
tl_cfg_ctl_wr
data0 data1
addr0 addr1
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