參數(shù)資料
型號： MC92602ZTA
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196
封裝： MAPBGA-196
文件頁數(shù)： 42/98頁
文件大小： 896K
代理商： MC92602ZTA
MOTOROLA
Chapter 4. Rate Adaption of Packet Data Streams
4-3
Rate Adaption Method
4.1.2
Idle Context
The idle context is when the transceivers are transmitting idle ordered sets when the link is
idle or during inter-packet gaps (IPG). An idle ordered set consists of two types of code
group pairs:
/I1/: /K28.5/D5.6
/I2/: /K28.5/D16.2
where /I1/ is a correcting idle and /I2/ is a preserving idle. However, there is a more general
denition of an idle ordered set as any pair of code groups where the rst code group is a
/K28.5/ followed by a /Dxx.x/ code group where /Dxx.x/ is not /D21.5/ or /D2.2/. The rules
for the insertion of idle ordered sets into a packet stream dictate that the resulting running
disparity be negative after the idle code group is inserted. A correcting idle, /I1/, toggles
positive running disparity to negative; a preserving idle, /I2/, maintains negative running
disparity. These rules are in place specically to allow the addition or deletion of preserving
idle ordered sets by repeaters to accommodate retiming. Therefore, rate adaption in the idle
context is accomplished through the addition and deletion of preserving idle ordered sets.
The MC92602, upon detection of an imminent overow, searches for and deletes an /I2/
ordered set, removing a total of two code groups from the packet stream. The packet stream
tolerates deletion of /I2/ as described above. Deleting /I2/ raises concerns about IPG
shrinkage. The IEEE Std 802.3 specication [5], clause 4.4.2.4, requires the IPG on
transmit to be at least 12 code groups in duration, including the end of packet delimiter
(EPD). The received IPG is only required to be at least 8 code groups in duration, leaving
4 code groups available to remove per IPG.
NOTE
The MC92602 does not verify that the IPG meets minimum
length requirements after removal of the /I2/ code groups. It
assumes that the IPG is at least 12 code groups in length when
received.
Upon detection of an imminent underow, the MC92602 searches for an /I2/ ordered set
and inserts an /I2/ adjacent to it into the packet stream, adding a total of 2 code groups. The
packet stream tolerates additional /I2/ ordered sets because maximum IPG length is not
limited.
Special consideration is given to IPG in the data context to accommodate Jumbo frames and
frame bursting. These are described in the next section.
4.1.3
Data Context
The data context is when the transceivers are transmitting MAC frames encapsulated into
code group packets. The code groups in the packet can not be disturbed, therefore, rate
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