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| 型號： | MC92600 |
| 廠商： | Motorola, Inc. |
| 英文描述： | High-speed, Full-duplex, Serial Data Interface(高速全雙工串行數據接口) |
| 中文描述： | 高速，全雙工，串行數據接口（高速全雙工串行數據接口） |
| 文件頁數： | 29/82頁 |
| 文件大小： | 1056K |
| 代理商： | MC92600 |
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Chapter 3. WarpLink Receiver
3-7
Alignment Modes
type of byte alignment method.
There are two types of word synchronization events: the 4/1 idle sequence and the
disparity-based idle sequence.
￥
The 4/1 idle sequence is deTned as four consecutive idle characters followed by a
non-idle character.
￥
The disparity-based idle sequence is 16 consecutive idle characters with improper
disparity on the second and fourth idle character in the sequence. The
disparity-based idle sequence is described further in Section 2.4.1, òTransmitting
Uncoded Data.ó
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 onto the initially established synchronization. Word
synchronization remains locked until one of three events occurs that indicate loss of
synchronization.
Word synchronization lock can be lost in three ways:
￥
When one or more of the receivers lose or change byte alignment. Byte alignment
loss is described in Section 3.3.1.1, òByte-Aligned with Realignment.ó
￥
When overrun/underrun is detected on one or more of the receivers but not on all
simultaneously, see Section 3.4.2, òReference Clock Modeó for more about
overrun/underrun.
￥
When explicitly invalidated by asserting WSE_GEN high and XMIT_n_K low on
all four receivers.
When lock is lost, word synchronization must be re-established before data ow through
the receiver resumes.
The receiver interface is disabled during initial word alignment. No data is produced at its
Table 3-3. Word Synchronization Events
Word Synchronization Event
BSYNC_0
BSYNC_1
4 idle/1 non-idle
Low
dont care
Disparity-based idle sequence
High
Low
Non-aligned
High
High
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