參數(shù)資料
型號(hào)： MC92602ZTA
廠商： MOTOROLA INC
元件分類(lèi)： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196
封裝： MAPBGA-196
文件頁(yè)數(shù)： 44/98頁(yè)
文件大?。?/td> 896K
代理商： MC92602ZTA
MOTOROLA
Chapter 4. Rate Adaption of Packet Data Streams
4-5
Special Considerations
continues normally thereafter. The repeated code group is reported as an underrun error as
described in Section 3.3.6.3. The MAC sublayer should 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 four code groups, 40 bit-times, when in the compatibility mode.
Word synchronization, as described in Section 3.3.4, 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, then rate
adaption is not performed by the device and the data stream is transferred unmodied. 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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