Altera Arria V Avalon-ST - Manual (Page 28)

Parameter Value Description
Slot clock
configuration
On/Off When On, indicates that the Endpoint or Root Port uses the
same physical reference clock that the system provides on the
connector. When Off, the IP core uses an independent clock
regardless of the presence of a reference clock on the
connector.
Port Function Parameters Shared Across All Port Functions
Device Capabilities
Table 3-3: Capabilities Registers
Parameter Possible Values Default Value Description
Maximum
payload size
128 bytes
256 bytes
512 bytes 128 bytes Specifies the maximum payload size supported. This
parameter sets the read-only value of the max payload
size supported field of the Device Capabilities register
(0x084[2:0]). Address: 0x084.
Number of
tags
supported
per
function
32
64 32 - Avalon-ST Indicates the number of tags supported for non-posted
requests transmitted by the Application Layer. This
parameter sets the values in the Device Control register
(0x088) of the PCI Express capability structure
described in Table 9–9 on page 9–5.
The Transaction Layer tracks all outstanding
completions for non-posted requests made by the
Application Layer. This parameter configureTags
supportedes the Transaction Layer for the maximum
number to track. The Application Layer must set the tag
values in all non-posted PCI Express headers to be less
than this value. Values greater than 32 also set the
extended tag field supported bit in the Configuration
Space Device Capabilities register. The Application
Layer can only use tag numbers greater than 31 if
configuration software sets the Extended Tag Field
Enable bit of the Device Control register. This bit is
available to the Application Layer on the
tl_cfg_ctl
output signal as
cfg_devcsr[8]
.
Completion
timeout
range
ABCD
BCD
ABC
ABCD Indicates device function support for the optional
completion timeout programmability mechanism. This
mechanism allows system software to modify the
completion timeout value. This field is applicable only to
2014.12.15
Port Function Parameters Shared Across All Port Functions 3-5
Parameter Settings Altera Corporation
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