Altera POS-PHY Level 2 and 3 Compiler - Manual (Page 20)

2–8 Chapter 2: Getting Started
POS-PHY Level 2 & 3 Walkthrough
POS-PHY Level 2 and 3 Compiler User Guide © November 2009 Altera Corporation
Preliminary
1 The wizard indicates the minimum Burst value supported.
You must also adjust the FIFO thresholds so that the data sent to the FIFO for a
burst is greater than the burst (an end of packet of packet flushes the FIFO). The
minimum and maximum values are set as follows:
■ The minimum value must be set at the size of the remote burst. If you set any
value below this, it is automatically adjusted to the size of the remote burst.
■ The maximum value is derived from the empty threshold. It must take into
account the latency in the pipeline and the time that the core takes to decide to
stop sending data. Therefore, the maximum burst size is calculated as follows:
(‘A’ interface empty threshold in bytes) – (5 × fifo_byte_width)
Where fifo_byte_width is the width in bytes of the FIFO (4 for a 32-bit data
width).
f For more information on the FIFO buffer settings, see “FIFO Buffer Settings” on
page 3–9 .
12. Click Next.
13. Choose the address and packet available settings (see Figure 2–10 ).
f For more information on the address and packet available settings, see “Address &
Packet Available Settings” on page 3–15 .
14. Click Next.
15. IP Toolbench shows the product order codes (see Figure 2–11 ). Click Finish.
Figure 2–10. Choose the Address and Packet Available Settings