参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 46/144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
4–6
Chapter 4: Functional Description—Receiver
Block Description
f For a more complete list of errors detected by the MegaCore function, refer to “Error
Clock-Domain Crossing Buffer
This block instantiates a clock-domain crossing buffer called alignment buffer (ABUF)
to transfer data from the rdint_clk clock domain to the rxsys_clk clock domain. The
depth of the alignment buffer is fixed at 128; the width is equal to the MegaCore
function data path width.
f For a description of the relationship between rdint_clk and rxsys_clk , refer to
SOP Alignment & Atlantic Conversion
This block moves the SOP for each packet to the first-byte position on the Atlantic
interface, and aligns the data to ensure that valid data is contiguous (no IDLEs) before
sending it to the Atlantic buffer.
Atlantic Buffers
The Atlantic FIFO buffers provide the following features:
Single receive slave-source Atlantic interface on the user end
Configurable buffer size
Support for crossing clock domains
Buffer status interface
Overflow error indication
Underflow warning indication
Configurable FIFO buffer threshold low (FTL)
Optional end-of-packet-based data available ( aN_arxdav ) signal assertion
Atlantic interface error checking
Missing or spurious SOP/EOP detection and correction
Optional overflow handling
Shared Buffer with Embedded Addressing
When the shared buffer with embedded addressing mode is selected, the POS-PHY
Level 4 MegaCore function consists of the receiver processor logic and a shared FIFO
buffer with embedded addressing.
The shared buffer is a single Atlantic FIFO buffer, where for each data word a tag is
carried containing the port number. This means that the Atlantic-side logic cannot
selectively pick a port to access. Instead, data bursts from all ports are stored
collectively into this one shared physical buffer, and the ordering of the data bursts is
maintained in the order in which they were received on the SPI-4.2 bus.
POS-PHY Level 4 MegaCore Function User Guide
May 2013 Altera Corporation
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