cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 103

• Manufacturer Part Number: cx28560
• Description: Hdlc Controller
• Manufacturer: Mindspeed Technologies

CX28560 Data Sheet
28560-DSH-001-B
The CX28560 has two types of interrupt descriptor. One is the BUFFC Interrupt
Descriptor, the other is the Non-BUFFC Interrupt Descriptor.
The following items describe the errors/events reported in the BUFFC Interrupt
Descriptor:
2.
3.
4.
• RxEOM (Receive End of Message). This interrupt is accompanied by a
• RxEOC/TxEOC (Receive/Transmit End of Command Execution). The
• RxNFFRAMEI/ TxNFFRAMEI (Receive/Transmit Change to New
• RxSHRT (Receive Too Short Message).
• RxPOSERR/TxPOSERR (Receive/Transmit Error).
• ILOST (Interrupt Lost).
The ILOST interrupt bit indicates that an interrupt has been lost internally
when the CX28560 generates more interrupt descriptors than can be stored in
the Interrupt Queue in shared memory. The latency of host processing of the
Interrupt Queue (handling the interrupts in the IRS) can be a factor in this, as
can the length of the actual queue. This condition is conveyed by the CX28560
overwriting the ILOST bit field in the last interrupt descriptor in the internal
queue prior to being transferred out to shared memory. The bit field is not
specific to or associated with the Interrupt Descriptor being overwritten. Only
one bit is overwritten and the integrity of the original descriptor is maintained.
The PERR interrupt bit indicates that a parity error was detected by the
CX28560 during a PCI access cycle. This condition is conveyed by the
CX28560 overwriting the PERR bit field in the last interrupt descriptor in the
internal queue prior to being transferred out to shared memory. The bit field is
not specific to or associated with the interrupt descriptor being overwritten.
Only one bit is overwritten and the integrity of the original descriptor is
maintained.
The POSERR interrupt indicates that either a POS-PHY buffering error
occurred (underrun or overflow), or that a parity error was detected on the data
in bus (CX28560’s Transmit data POS-PHY bus).
message status - RxERR (Errored Message Coding). The message status
included in an interrupt can be one of the following:
– RxNOERR – No errors in the message
– RxFCS – Frame Check Sequence Error
– RxBUFF – Overflow
– RxCOFA – Change Of Frame Alignment
– RxOOF – Out Of Frame
– RxABT – Abort Frame
– RxLNG – Long Message
– RxALIGN – Byte Alignment Error
RBUFFC or TBUFFC has completed the activation/deactivation of a channel.
Flexiframe Indication). The CX28560 receive/transmit BUFFC has completed
the transition to the new Flexiframe.
Mindspeed Technologies™
Advance Information
The CX28560 Memory Organization
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