Altera Arria V Avalon-ST - Manual (Page 29)

Parameter Possible Values Default Value Description
AB
B
A
None
Root Ports and Endpoints that issue requests on their
own behalf. Completion timeouts are specified and
enabled in the Device Control 2 register (0x0A8) of the
PCI Express Capability Structure Version. For all other
functions this field is reserved and must be hardwired to
0x0000b. Four time value ranges are defined:
• Range A: 50 us to 10 ms
• Range B: 10 ms to 250 ms
• Range C: 250 ms to 4 s
• Range D: 4 s to 64 s
Bits are set to show timeout value ranges supported. The
function must implement a timeout value in the range
50 s to 50 ms. The following values specify the range:
• None – Completion timeout programming is not
supported
• 0001 Range A
• 0010 Range B
• 0011 Ranges A and B
• 0110 Ranges B and C
• 0111 Ranges A, B, and C
• 1110 Ranges B, C and D
• 1111 Ranges A, B, C, and D
All other values are reserved. Altera recommends that
the completion timeout mechanism expire in no less
than 10 ms.
Implement
completion
timeout
disable
On/Off On For Endpoints using PCI Express version 2.1 or 3.0, this
option must be On. The timeout range is selectable.
When On, the core supports the completion timeout
disable mechanism via the PCI Express
Device
Control Register 2
. The Application Layer logic must
implement the actual completion timeout mechanism
for the required ranges.
3-6 Device Capabilities
2014.12.15
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