參數(shù)資料
型號(hào)： MC92602ZTA
廠(chǎng)商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196
封裝： 15 X 15 MM, 1.60 MM HEIGHT, 1 MM PITCH, MAPBGA-196
文件頁(yè)數(shù)： 45/102頁(yè)
文件大?。?/td> 1581K
代理商： MC92602ZTA
MOTOROLA
Chapter 4. Rate Adaption of Packet Data Streams
4-5
Special Considerations
Interface Error Codes.” The MAC sublayer should detect the missing code group as a CRC
error.
Underrun may occur when an appropriate code group to insert can ot be identified. In this
situation, one data code group is repeated in the packet stream. The received packet stream
continues normally thereafter. The repeated code group is reported as an underrun error as
detect the repeated code group as a CRC error.
4.3
Special Considerations
When the compatibility mode is enabled by setting COMPAT high, special rules for rate
adaption are followed as described above. Additionally, the receiver’s elastic buffers
operate differently to account for Jumbo frames. In order to ensure against starvation of the
elastic buffer in the presence of Jumbo frames, the elastic buffers are allowed to accumulate
four additional code groups, leading to longer receiver latency. Receiver latency increases
by 4 code groups, 40 bit-times, when in the compatibility mode.
Word synchronization, as described in Section 3.3.4, “Word Synchronization,” is not
supported in the compatibility mode. Each channel is considered to be an independent
packet stream.
If the MC92602 is being operated in recovered clock mode, see Section 3.3.7.1,
“Recovered Clock Timing Mode,” then rate adaption is not performed by the device and
the data stream is transferred unmodified. The compatibility mode would have no effect on
device operation and is not required.
The compatibility mode should not be used in backplane applications that are not utilizing
standard protocol.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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