参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 39/144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
Chapter 3: Parameter Settings
3–17
Protocol Parameters
The FIFO buffer threshold low (FTL) value for receiver variations controls when the
aN_arxdav signal is asserted for the read side of the FIFO buffer. If the fill level of the
buffer is higher than the FTL value, the aN_arxdav signal is asserted indicating that
there is a burst of data available.
1
1
There is no requirement to wait for the aN_arxdav signal to be asserted, you can read
from the buffer at any time.
FTL must be greater than zero.
This threshold is defined in terms of bytes, with a valid range from: N to buffer size ,
in increments of N bytes, where:
N = 4 or 8 bytes for 32-bit data path variations
N = 8 or 16 bytes for 64-bit data path variations
N = 16 bytes for 128-bit data path variations
The N -byte values for the 32-bit and 64-bit variations depend on the Atlantic interface
width. If the Atlantic interface width is greater than the data path width, the larger
value for N is used.
For the DIP-4 good and DIP-4 bad threshold values, two 4-bit inputs are associated
with the DIP-4 OOS state machine: good_level ( ctl_rd_dip4_good_threshold ) and
bad_level ( ctl_rd_dip4_bad_threshold ) .
If the stat_rd_dip4_oos signal is high, and all of the DIP-4s in the control words
received in the current clock cycle (up to 8 in 128-bit mode) are good, the good counter
is incremented by 1; otherwise it is reset to 0. If the good counter reaches the
good_level threshold, the stat_rd_dip4_oos flag is cleared. A good_level of 0 is
invalid.
If the stat_rd_dip4_oos signal is low, and all of the DIP-4s in the control words
received in the current clock cycle (up to 8 in 128-bit mode) are errored, the bad
counter is incremented by 1; otherwise it is reset to 0. If the bad counter reaches the
bad_level threshold, the stat_rd_dip4_oos flag is asserted. A bad_level of 0 is
invalid.
1
The receiver may need to receive more control word DIP-4 errors than the DIP-4 bad
threshold parameter set in the wizard, for stat_rd_dip4_oos to go high.
f For more information, refer to “DIP-4 Marking” on page 4–17 and “DIP-4 Out of
May 2013
Altera Corporation
POS-PHY Level 4 MegaCore Function User Guide
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