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IXP400 Software
Access-Layer Components: Parity Error Notifier (IxParityENAcc) API
Programmer’s Guide IXP400 Software Version 2.0 April 2005
Document Number: 252539, Revision: 007 237
16.3 IxParityENAcc API Details
16.3.1 Features
The parity error access component provides the following features:
• Interface to the client application to register a call back handler for application-specific
processing with respect to the source of failure in the notification.
• Interface to the client application to individually enable and disable parity detection in the
following hardware blocks, which are capable of generating parity errors. This interface can be
invoked multiple times either to enable/disable or query parity error detection capabilities.
— Instruction and Data Memory of the Network Processing Engines (NPEs)
— Switching coprocessor in NPE B (SWCP)
— AHB Queue Manager’s SRAM (AQM)
— PCI Controller
— Expansion Bus Controller
— DDR SDRAM Memory Controller Unit (MCU).
• Interface to query the parity error detection status (whether enabled or not) on each of the
above components.
• Interface to get the parity error detection statistics for each of the above-mentioned
components.
• Interface exchanges the data structures defined in the host byte order with the client
application. This module operates in both big endian and little endian mode.
16.3.2 Dependencies
The client application at the time of initialization registers the parity error handler callback with
IxParityENAcc. The client application also makes use of the parity error detection API to enable
the underlying hardware blocks for parity error detection.
Table 46. Parity Capabilities Supported by IxParityENAcc
Feature Hardware Component Software Support Recoverable
Error Correction Code Memory Controller Unit - SDRAM
Single Bit Parity Error Notification Yes
Multi-Bit Parity Error Notification No
Parity Error Detection AHB Queue Manager SRAM Parity Error Notification No
Parity Error Detection
NPE IMEM, DMEM, AHB
Coprocessor, Switch
Coprocessor
Parity Error Notification No
Parity Error Detection Switch Coprocessor Parity Error Notification No
Parity Error Detection PCI Controller Parity Error Notification No
Parity Error Detection Expansion Bus Controller Parity Error Notification No