参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 26/144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
3–4
Chapter 3: Parameter Settings
Basic Parameters
For transmitters for individual buffers variations, a credit-based scheduler is
provided. This scheduler decodes the incoming status channel and decides from
which FIFO buffer (port) to transmit.
The individual buffers for transmitters offer the following advantages:
A simple user interface
Full scheduler
No head-of-line blocking
Per-port backpressure
f For further information on individual buffers for transmitters, refer to “Individual
For receivers, the individual buffers offer the following advantages:
A simple user interface
No head-of-line blocking
The POS-PHY Level 4 MegaCore function handles all of the backpressure
automatically
f For further information on individual buffers for receivers, refer to “Individual
The SPI-4.2 protocol supports from 1 to 256 ports. When you select the number of
ports, you determine the mode of operation. Single-PHY operation for one port; or
multi-PHY for two to 256 ports. For example, when interfacing to a 10-channel Gbit
Ethernet MAC device the number of ports is 10.
When you use the shared buffer with embedded addressing, the Number of ports
determines the number of port addresses supported by the POS-PHY Level 4 protocol
portion of the MegaCore function, such as the status generator and error checker. Port
addresses 0 to 255 can always be sent and received when using Shared buffer with
embedded addressing .
For the shared buffer with embedded addressing, the Buffer size defines the size of
the shared embedded address buffer. For the individual buffers, the Buffer size
defines the size of each buffer. The POS-PHY Level 4 MegaCore function supports the
following sizes (per buffer):
512 bytes
1,024 bytes
2,048 bytes
4,096 bytes
8,192 bytes
16,384 bytes
32,768 bytes
POS-PHY Level 4 MegaCore Function User Guide
May 2013 Altera Corporation
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