IP-POSPHY4 Altera, IP-POSPHY4 Datasheet - Page 59

• Manufacturer Part Number: IP-POSPHY4
• Description: IP CORE - POS-PHY Level 4 SPI 4.2 Interface
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IP-POSPHY4

• Software Application: IP CORE, Interface And Protocols, COMMUNICATION
• Supported Families: Arria GX, Cyclone, HardCopy, Stratix
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: POS-PHY Level 4 Interface, Link-Layer/PHY Layer
• License: Initial License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Chapter 4: Functional Description—Receiver
Error Flagging and Handling
December 2010 Altera Corporation
Atlantic Interface Error Detection and Handling
f
The DIP-4 out-of-service status signal does not affect the data portion of the receiver.
However, it does affect the status channel portion, causing framing to be sent to the
adjacent device.
When reset, the stat_rd_dip4_oos flag is asserted (high). It remains asserted until the
reset is deasserted and a good_level number of consecutive control words that do not
contain DIP-4 errors are received.
Figure 4–8
state and bad threshold is 3.
Figure 4–8. DIP-4 Counter
Notes to
(1) Receiving a good and a bad DIP-4 in the same parallel cycle resets the counter (does not increment it), so that OOS
For further information on the DIP-4, refer to the System Packet Interface Level 4 (SPI-4)
Phase 2 Revision 1: OC-192 System Interface for Physical and Link Layer Devices, available
at www.oiforum.com.
When the Atlantic error checking parameter is turned on, a filtering block—the
Atlantic FIFO buffer error checker—is instantiated at the write side of the FIFO buffer
to ensure that the MegaCore function does not pass errored packets.
does not trigger.
Bad DIP-4 Counter
Bus (Four-Lane)
Internal Parallel
Figure
SPI-4.2 Bus
shows an example of the DIP-4 counter, where the receiver is in service
4–8:
Counter
Resets
Increments by 1
0
Non-control word (payload)
Control word witih good DIP-4
Control word with bad DIP-4
(Note 1)
Increments by 1
1
Unchanged
2
2
Counter (1)
Resets
POS-PHY Level 4 MegaCore Function User Guide
Counter
Resets
0
0
Counter
Resets
0
4–19