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參數(shù)資料
| 型號： | MC92600ZTB |
| 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, PLASTIC, MAPBGA-196 |
| 文件頁數(shù)： | 27/98頁 |
| 文件大?。?/td> | 1288K |
| 代理商： | MC92600ZTB |
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MOTOROLA
Chapter 3. Receiver
3-5
Alignment Modes
3.3.1
Byte Alignment
The receiver supports three modes of byte alignment as dened by the BSYNC_0,
BSYNC_1 and WSE signals. As described in Table 3-2, the three types of byte alignment
modes: byte alignment with realignment, byte alignment with idle realignment and
disparity-based word alignment, and non-aligned data.
NOTE
In byte alignment modes and not word synchronization (WSE
= low), BSYNC_0 must be high.
3.3.1.1
Byte-Aligned with Realignment
At power-up, the receiver starts an alignment procedure, searching for the 10-bit pattern
dened by the 8B/10B idle code. Synchronization logic checks for the distinct idle
sequence, ‘0011111010’ and ‘1100000101’ (ordered bit 0 to bit 9), characteristic of the
K28.5 idle pattern. The search is done on the 10-bit data in the receiver, and is therefore
independent of TBI mode. Alignment requires a minimum of four, error-free, received idle
characters to ensure proper alignment and lock. Non-idle characters may be interspersed
with the idle characters. The disparity of the idle characters is not important to alignment
and can be positive, negative or any combination. The receiver begins to forward received
characters once locked on an alignment. However, if word synchronization is enabled
(WSE = high), received characters are not forwarded to the receiver interface until the
rst, valid, non-idle character is received. Alignment remains locked until one of three
events occurs that indicate loss of alignment:
Alignment is lost when a misaligned idle sequence is detected. A misaligned idle
sequence is dened as four idle characters with an alignment different from the
current alignment. Non-idle characters may be dispersed between the four
misaligned idles, however, a properly aligned idle character breaks the sequence.
Alignment is changed to the newly detected alignment without interrupting data
ow through the receiver if in Byte Aligned Mode (WSE = low). However, if in
Word Aligned Mode (WSE = high) word alignment is lost.
Alignment is also lost when the number of received characters with 8B/10B coding
errors outnumbers the non-error characters by four. Misalignment detection of this
Table 3-2. Byte Alignment Modes
Byte Alignment Mode
BSYNC_0
BSYNC_1
WSE
Byte aligned with realignment
High
Low
Byte aligned with idle realignment and disparity word
alignment, see Section 3.3.2.1.
High
Low
High
Non-aligned
High
Low
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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