参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 114/144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
A–4
Appendix A: Start-Up Sequence
Troubleshooting
1. The PLL locked signal is not asserted or toggles. Ensure that the input clock jitter is
within the PLL jitter requirements. In some cases, if the PLL locked signal toggles,
the PLL must be reset. If so, perform the appropriate steps listed in Table A–1 on
page A–2 . Refer to your PLL’s documentation for further information.
2. Data channel does not sync. This problem can be detected when
stat_rd_rdat_sync remains low or toggles. The following tips may prove useful:
Ensure all resets are released.
Ensure all clocks are up, and measure clock frequencies.
Ensure training patterns are received.
3. Data channel syncs but only training patterns are received. This problem can be
detected when stat_rd_rdat_sync goes high, but no data is received, and
stat_rd_tp_flag toggles. The following tips may prove useful:
For 128-bit receiver variations, ensure that the rxsys_clk to rdint_clk ratio is
set according to the receive clock setting in Table C–1 on page C–1 .
Ensure that the calendar length and calendar multiplier are set to the same
values in both devices.
Verify timing requirements for the status channel
Select the clock edge that drives or samples the clock with ctl_ts_statedge
and ctl_rs_statedge .
Verify t co for the rsclk and rstat pins in the receiver MegaCore function. The
ALTDDIO megafunction keeps on-chip skew to a minimum.
Verify board skew for rsclk / rstat
Verify the setup and hold times for tstat on tsclk in the transmit MegaCore
function. The ALTDDIO megafunction keeps on-chip skew to a minimum.
Verify that tsclk is operating at the correct frequency.
4. Data channel syncs but stat_ry_disabled goes high or toggles. The rx_stat_phy
FIFO buffer may be underflowing or overflowing, due to incorrect configuration.
For guidance, refer to the relevant comments in <variation name> _rx_core.v HDL
file ( rx_stat_phy section, setting the thresholds).
5. Receive MegaCore function detects DIP-4 errors during normal transmission. The
following tips may prove useful:
The receiver MegaCore function (non-DPA variations) assume that the data is
edge aligned. The alignment can be changed at the receiver and transmitter. It
is easier to change the receiver by specifying a different alignment using the
INCLOCK_DATA_ALIGNMENT parameter of the ALTLVDS megafunction. In the
transmitter, the tdclk can be driven by a PLL clock output instead of a SERDES
POS-PHY Level 4 MegaCore Function User Guide
May 2013 Altera Corporation
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