参数资料
| 型号： | IP-POSPHY4 |
| 厂商： | Altera |
| 文件页数： | 31/144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 |
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Chapter 3: Parameter Settings
3–9
Optional Features
In some cases, it is better to ignore this signal and rely on the error checking
mechanisms or SPI4.2, by checking the DIP4 calculation. You then have to externally
request the retraining and unlock the DPA block.
It is normal during the normal data transfer in SPI-4.2 that dpa_locked signal can
become de-asserted due to some jitter that is still within 0.44 UI of LVDS data. The
DPA has a low pass filter that filters out very high frequency jitter from affecting the
lock signal and phase of rx_clk . If the jitter is detected to be 0.25 UI (two phases out of
8 jump in one direction), dpa_locked is de-asserted and it is still within 0.44 UI.
The DIP-4 error marking determines how the receiver handles DIP-4 errors. The
receiver uses the following three modes to mark received DIP-4 errors:
■
■
■
None—no error marking is performed.
Optimistic mode—the receiver MegaCore function marks the preceding and
succeeding burst as errored. If these bursts are payload (that is, if a DIP-4 occurs
followed by IDLE s), then only the preceding control word payload is marked as
errored. Bursts going into the Atlantic FIFO buffer are marked with the Atlantic
error signal. If a burst is not an EOP, it is up to the user logic to detect it.
Pessimistic mode—the receiver MegaCore function marks all open packets as
errored. Packets going into the Atlantic FIFO buffer are marked with the Atlantic
error signal. This feature increases in resource utilization as the number of ports
increases.
End-of-packet-based data available controls the aN_arxdav signal on the Atlantic
FIFO buffer. Turn on so the aN_arxdav signal is asserted (high) when at least one EOP
is in the buffer, or the fill level is above FIFO threshold low ( ctl_ax_ftl ). Turn off so
the aN_arxdav signal is asserted (high) only if the fill level of the FIFO buffer is above
the FIFO threshold low value.
The Status source option applies only to variations using the shared buffer with
embedded addressing mode and provides the following two status channel control
options:
■
■
Buffer Fill Level —the status for each channel is controlled by the single buffer ’s
status. Every calendar time slot contains the result of the almost empty (AE) and
almost full (AF) comparison to the buffer level.
User Controlled —to add extra pins, which allows you to directly control the
transmitted buffer status and allows you to send a status irrespective of the fill
level of the internal FIFO buffers, which avoids the situation where the FIFO
buffer is not emptied quickly enough, and if you still request data, the FIFO buffer
overfills.
Turn on Safe External (User Controlled) Status , to ensure the sent status avoids FIFO
buffer overflow (refer to Table 3–3 ). Turn off Safe External (User Controlled) Status ,
to ensure the sent status is always the user status (refer to Table 3–3 ), irrespective of
buffer fill level.
May 2013
Altera Corporation
POS-PHY Level 4 MegaCore Function User Guide
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