IP-POSPHY4 Altera, IP-POSPHY4 Datasheet - Page 58

• 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

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POS-PHY Level 4 MegaCore Function User Guide
DIP-4 Out of Service Indication
A DIP-4 out-of-service (stat_rd_dip4_oos) status signal provides an in-service or out-
of-service indication based on recent DIP-4 errors. Two 4-bit inputs are associated
with this signal: good_level (ctl_rd_dip4_good_threshold) and bad_level
(ctl_rd_dip4_bad_threshold).
Figure 4–7. DIP-4 OOS State Machine
If the receiver is in service (the stat_rd_dip4_oos is low) and one or more DIP-4
errors are detected (up to 8 in 128-bit mode) in the current rdint_clk cycle, the bad
counter is incremented. If the bad counter reaches the bad_level threshold, the
receiver goes out of service by asserting the stat_rd_dip4_oos signal. If any of the
DIP-4s received in the current cycle are good, the bad counter is cleared. So if both
good and bad DIP-4s are received in the current cycle the bad counter is also cleared.
If no control words are received, nothing happens.
If the receiver is in service and the bad threshold is set to 0 or 1, the receiver goes out
of service as soon as a single DIP-4 error is detected.
If the receiver is out of service and there are no DIP-4 errors in the current rdint_clk
clock cycle, the good counter is incremented. If the good counter reaches the
good_level threshold, the receiver goes in service and asserts. If any DIP-4 errors are
received in the current cycle, the counter is cleared. If no control words are received,
nothing happens.
Chapter 4: Functional Description—Receiver
December 2010 Altera Corporation
Error Flagging and Handling