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PM7348 参数 Datasheet PDF下载

PM7348图片预览
型号: PM7348
PDF下载: 下载PDF文件 查看货源
内容描述: [ATM/SONET/SDH IC, CMOS, PBGA324,]
分类和应用: ATM异步传输模式
文件页数/大小: 318 页 / 1736 K
品牌: PMC [ PMC-SIERRA, INC ]
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S/UNI-IMA-4 Telecom Standard Product Data Sheet  
Released  
10.7.2 Interrupt Driven Error/Status Reporting  
The interrupt logic has several layers. The top layer of the interrupt logic, the Master Interrupt  
Register, indicates from which block the interrupt came. Once the block is determined the  
processor can access the appropriate block to determine the interrupt cause.  
TC Layer Interrupts  
The TC layer sources 4 different interrupts that are reported through a FIFO structure. As each  
interrupt occurs it is placed into a FIFO along with a Link Identifier to uniquely identify the  
link. The error conditions reported through this structure include HEC Errors, Loss of Cell  
Delineation (LCD) state change, Out of Cell Delineation (OCD) state change, and Receive Link  
FIFO overflow. To determine the actual states of LCD and OCD it is necessary to query the  
individual link status. If this FIFO overflows, it is necessary to query the status of all links in  
order to retrieve accurate state information.  
IMA Interrupts  
The IMA sub-layer sources four interrupts: RIPP_INTR, TIMA_INTR, RDAT_INTR, and  
ICP_CELL_AVL. The RIPP_INTR indicates that either a status change or an error occurred on  
an IMA group. The RIPP Interrupt status FIFO contains the groups that have enabled conditions  
active. The RIPP Interrupt status FIFO is managed so that each group will only ever have a  
single entry in the FIFO. To facilitate interrupt processing, a RIPP command is provided to  
gather all interrupts and status for a group and all of the links within the group in one snapshot.  
TIMA_INTR provides information that a link FIFO has overflowed. During normal operations,  
this will only happen when: (1) the TIMA is misconfigured or (2) the rate difference between  
the clocks in an IMA group is greater than the maximum tolerance. To determine which link has  
experienced a problem, the TIMA Link FIFO Overflow Status registers should be read.  
RDAT_INTR indicates either: (1) that cells were dropped due to Any-PHY/UTOPIA congestion  
or (2) that TC group cells were dropped due to FIFO overflow. To determine the cause of the  
interrupt, the RDAT Master Interrupt register should be read.  
ICP_CELL_AVL indicates that an ICP cell is available in the ICP cell buffer. To enable  
diagnostics, the capability to forward a group’s ICP cells to the microprocessor is provided.  
When a cell is forwarded to the microprocessor, it is placed in the ICP cell buffer and the  
interrupt is triggered. As new ICP cells arrive, they overwrite the ICP cell buffer unless the  
buffer is locked for reading. Once the ICP cell buffer is locked, further ICP cells will not be  
forwarded until the ICP cell buffer is unlocked. This trace can be enabled on a per-group basis.  
Miscellaneous Interrupts  
MISC_INTR indicates that an interrupt condition exists in the Miscellaneous Interrupt register.  
These bits are read-and-clear and usually indicate that transitory conditions have occurred, such  
as parity errors, SDRAM CRC errors, interrupt FIFO overflows, and UTOPIA L2 interface  
errors.  
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.  
Document No.: PMC-2020889, Issue 2  
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