Altera Arria V GZ Avalon-ST - Manual (Page 99)

Signal Direction Description
Input • [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 is set to 0.
Input • [1]: Presence detect. This signal should be asserted when a
presence detect circuit detects a presence detect change in the
slot.
Input • [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 is set to 0.
Input • [3]: Power fault detected. This signal should be asserted when
the power controller detects a power fault for this slot. If this
slot has no power controller, this bit should be hardwired to 0,
and the
Power Controller Present
bit (bit[1]) in the Slot
capability register parameter is set to 0.
Input • [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 this slot has no power controller, this bit should be
hardwired to 0 and the
Power Controller Present
bit
(bit[1]) in the Slot capability register is set to 0.
Table 5-15: Mapping Between tl_cfg_sts and Configuration Space Registers
tl_cfg_sts Configuration Space Register Description
[52:49] Device Status Register[3:0] Records the following errors:
• Bit 3: unsupported request detected
• Bit 2: fatal error detected
• Bit 1: non-fatal error detected
• Bit 0: correctable error detected
[48] Slot Status Register[8] Data Link Layer state changed
[47] Slot Status Register[4] Command completed. (The hot plug
controller completed a command.)
UG-01127_avst
2014.12.15
Transaction Layer Configuration Space Signals 5-47
Interfaces and Signal Descriptions Altera Corporation
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