MT90500 Datasheet, PDF (17/159 Pages) Mitel Networks Corporation – Multi-Channel ATM AAL1 SAR

MT90500
• IEEE 1149 (JTAG) Boundary-Scan Test Access Port for testing board-level interconnect.
• Packaging: 240-pin PQFP.
2.8 Interrupts
The MT90500 provides a wide variety of interrupt source bits, allowing for easy monitoring of MT90500
operation. All interrupt source bits, including the module level interrupt bits, have an associated mask bit which
enables or disables assertion of the interrupt pin. This enables the user to tailor the interrupt pin activity to the
application. Interrupt source bits are set regardless of the state of the associated mask bit, so even source bits
which are disabled from causing an interrupt pin assertion may be polled by the CPU by reading the
appropriate register.
2.8.1 Module Level Interrupts
The following interrupt bits are used to indicate which MT90500 circuit module is the source of the interrupt.
They are set when one or more interrupt source bits in the particular circuit module is set. The CPU can find
the source of an interrupt by reading the register containing these bits and then reading the indicated module’s
interrupt register.
• TX_SAR Module Interrupt
• RX_SAR Module Interrupt
• UTOPIA Module Interrupt
• TDM Module Interrupt
• Timing (TDM Clock Generation) Module Interrupt
2.8.2
TX_SAR Interrupts
• Transmit Non-CBR Data Cell FIFO Overrun Interrupt
• Scheduler error (Indicates that the TX_SAR has too heavy a work load.)
2.8.3
RX_SAR Interrupts
• AAL1-byte Parity Error Interrupt
• AAL1-byte CRC Error Interrupt
• AAL1-byte Sequence Number Error Interrupt
• Pointer-byte Parity Error Interrupt
• Pointer-byte Out of Range Error Interrupt
• Underrun Error Interrupt
• Overrun Error Interrupt
• Miscellaneous Counter Rollover Interrupt
• Underrun Counter Rollover Interrupt
• Overrun Counter Rollover Interrupt
2.8.4
UTOPIA Interrupts
• Receive Non-CBR Data Cell FIFO Overrun Interrupt
• RX UTOPIA Module Internal FIFO Overrun Interrupt
• Receive Non-CBR Data Cell FIFO Receive Cell Interrupt
2.8.5
TDM Interrupts
• Clock Absent Interrupt
• Clock Fail Interrupt
• TDM Out of Bandwidth Interrupt
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