IPSERIALLITE Altera, IPSERIALLITE Datasheet - Page 84

• Manufacturer Part Number: IPSERIALLITE
• Manufacturer: Altera

Specifications of IPSERIALLITE

• Lead Free Status / RoHS Status: Not Compliant

SerialLite Link Configuration
3–52
SerialLite MegaCore Function User Guide
The size of the FIFO buffers can be optimized to avoid the situation where
a FIFO buffer is sitting empty with no data feeding it. The Optimize FIFO
buffer size to avoid starvation option automatically sets a threshold size
that minimizes this risk. Components that are taken into account are the
core and wire latencies and the pause duration. These are automatically
calculated by the Parameterize - SerialLite MegaCore function wizard,
and the components of the calculation are displayed (see
Because the priority data receive FIFO buffer may have a large minimum
size, determined by the maximum packet size, the FIFO may already be
larger than required for avoiding starvation if the pause duration is short.
Alternatively, optimizing against starvation may by itself create a FIFO
buffer larger than the minimum required by the packet size. The wizard
automatically creates the smallest FIFO buffer that satisfies both the
minimum size requirement and the starvation setting for the priority
receive FIFO buffer.
Table 3–38
Storing Additional Priority Packets
A very simple way to increase the size of the priority data port receive
FIFO buffer is to size it to hold multiples of the minimum packet size
using the Parameterize - SerialLite MegaCore function wizard (see
Table
be selected, but in practice this can increase memory usage quickly, and
make it harder to achieve performance.
Enabled
Disabled
Table 3–38. Starvation Optimization Options
3–39). There is no theoretical limit to the number of packets that can
Option
MegaCore Function Version 1.1.0
shows the starvation optimization options.
The FIFO buffer threshold sizing is automatically increased
to avoid starvation during flow control. Available only if flow
control is enabled. This is the default setting.
The FIFO buffer threshold sizing is not increased to avoid
starvation during flow control. Available only if flow control is
enabled.
Description
Altera Corporation
Figure
August 2005
3–31).