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)： 33/102頁(yè)
文件大?。?/td> 1581K
代理商： MC92602ZTA
3-8
MC92602 SerDes Reference Manual
MOTOROLA
Functional Description
The word synchronization event is four (or more) consecutive (K28.5) idles followed by a
non-idle. Word synchronization events must be generated at all concerned transmitters
simultaneously in order for synchronization to be achieved. Word synchronization events
must be received at all concerned receivers within 40 bit-times of each other.
Word synchronization events are used to establish a relationship between the received bytes
in each of the receivers. The bytes of a word are matched and presented simultaneously at
the receiver interface. Once synchronization is achieved, the receiver tolerates +6 bit-times
of drift between receivers. If drift exceeds +6 bit-times, the receiver will continue to
operate. However, the received bytes will no longer be synchronized properly because the
receiver remains locked on the initially established synchronization. Word synchronization
remains locked until an event occurs that indicates loss of synchronization.
Word synchronization lock is lost when one or more of the receivers change or lose byte
alignment (byte alignment loss is described in Section 3.3.3.1, “Byte-Aligned”). Lock is
also lost when overrun/underrun is detected on one or more of the receivers, see
Word synchronization lock is lost when explicitly invalidated by asserting DROP_SYNC
and XCVR_x_DISABLE high for at least two clocks (see Section 2.3.4, “Transceiver
Disable,” for details on performing drop sync). When lock is lost, word synchronization
must be re-established before data flow through the receiver resumes.
The receiver interface is disabled during initial word synchronization. No data is produced
at its outputs until word synchronization is achieved and the first non-idle character is
received. When establishing word synchronization, or when word synchronization is lost,
‘Not Word Sync’ error is reported as described in Section 3.3.6.3, “Receiver Interface Error
3.3.4.1
Recommended Settings for Word Synchronization
Word synchronization can only be used with certain operating modes and has limited
application in others. Table 3-3 describes the relationship between modes and word
synchronization.
Table 3-3. Word Synchronization Settings
Mode
Signals
Recommended
State
Description
Word synchronization
WSE
High
Enables word synchronization.
Byte synchronization
BSYNC
High
Word synchronization depends on idle character
detection. Byte alignment is required for idle
detection.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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