參數(shù)資料
型號(hào)： MC92602ZTA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 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)： 44/102頁(yè)
文件大?。?/td> 1581K
代理商： MC92602ZTA
4-4
MC92602 SerDes Reference Manual
MOTOROLA
Error Handling
Data Context
The data context is when the transceivers are transmitting MAC frames encapsulated into
code group packets. The code groups in the packet cannot be disturbed, therefore, rate
adaption is accomplished in the IPG as described above. There are two special cases that
must be considered in the data context: Jumbo frames and frame busting.
Jumbo frames are not supported in the real standard, but are rather a de facto standard.
Jumbo frames violate the untagged maximum frame size of 1518 code groups and increases
the size to 16K code groups. Given a maximum total frequency offset of 200 ppm and the
size of the MC92602 elastic buffers, a Jumbo frame could lead to a surplus or deficit of
3.3 code groups for which rate adaption must account.
The MC92602, on detection of an imminent overflow, searches for and deletes an /I2/
ordered set, removing a total of two code groups from the IPG. If a Jumbo frame is detected
by evidence of a large surplus, two /I2/ ordered sets are deleted, removing a total of four
code groups.
Similarly, on detection of an imminent underflow, the MC92602 searches for a /I2/ ordered
set and inserts an /I2/ adjacent to it into the IPG, adding a total of two code groups. If a
Jumbo frame is detected by evidence of a large deficit, two /I2/ ordered sets are inserted,
adding a total of four code groups.
The size of the elastic buffers are increased by eight to accommodate accumulation of four
code groups to guard against later deficit, and to allow for the accumulation of an additional
four surplus code groups.
In half-duplex mode of operation as defined by the standard, frame bursting is allowed.
Frame bursting is an artifact of the CSMA/CD media access mechanism, where idle
ordered sets in the IPG are used to signal availability of the medium. Frame bursting allows
the transmitter to retain ownership of the medium by inserting carrier extend, /R/, ordered
sets in the IPG in place of idle ordered sets. A frame burst can be as long as 65 Kbits
(8K_code groups). An idle-based IPG must exist between frame bursts. Frame bursts are
shorter than Jumbo frames, therefore, frame bursting is supported using the same
mechanism as Jumbo frames previously described.
4.2
Error Handling
The receiver interface error reporting mechanisms as described in Section 3.3.6.3,
“Receiver Interface Error Codes,” are used in compatibility mode with one exception;
overrun/underrun errors are processed differently.
Overrun may occur when an appropriate code group to remove cannot be identified. In this
situation, one data code group is removed from the packet stream. The received packet
stream continues normally thereafter. The code group immediately following the removed
code group is reported as an overrun error as described in Section 3.3.6.3, “Receiver
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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