参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 28/144页
文件大小: 0K
描述: IP POS-PHY L4
标准包装: 1
系列: *
类型: MegaCore
功能: POS-PHY 4 级接口,链路层/物理层
许可证: 初始许可证
3–6
Chapter 3: Parameter Settings
Optional Features
Optional Features
Figure 3–2 on page 3–6 shows the Optional Features tab.
Figure 3–2. Receiver Optional Features
These parameters allow you to enable additional features that the MegaCore function
provides. Each parameter may increase or decrease the number of logic resources.
Turn on Atlantic error checking to add a packet filtering module to the write side of
every Atlantic FIFO buffer. The packet filtering module ensures that only properly
formatted packets are passed through the Atlantic FIFO buffer. When you turn off
Atlantic error checking , the packet filtering module is not added.
The packet filtering module corrects start-of-packet (SOP) and end-of-packet (EOP)
errors before writing packets into the FIFO buffer. For a missing SOP (where data or
an EOP is received for a port without first having received a SOP), an error output is
asserted, and data is not written to the buffer until a SOP is received. For a missing
EOP (where a SOP is received before the previous packet’s EOP), the current packet is
terminated by an EOP, and ERR is asserted. The next packet is stored normally.
For individual buffers variations with a large number of ports, the Atlantic error
checking increases the amount of logic.
Atlantic error checking is often desirable for receivers, but less applicable for
transmitters because the incoming user-Atlantic data may be presumed correct.
POS-PHY Level 4 MegaCore Function User Guide
May 2013 Altera Corporation
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