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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(shù)據(jù)接口) |
| 中文描述： | 高速，全雙工，串行數(shù)據(jù)接口（高速全雙工串行數(shù)據(jù)接口） |
| 文件頁數(shù)： | 30/82頁 |
| 文件大小： | 1056K |
| 代理商： | MC92600 |
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3-8
MC92600 WarpLink Quad Users Manual
Clock Modes
outputs until word alignment is achieved and the Trst non-idle character is received. When
establishing word alignment, or when word alignment is lost, the receivers RECV_n_ERR
signal is asserted high and the òNot Word Syncó error is reported as described in
Section 3.7, òReceiver Interface Error Codes.ó
3.3.2.2 Word Synchronization Recommended Settings
Word alignment can only be used with certain operating modes and has limited application
in others. Table 3-4 describes the relationship between modes and word synchronization.
3.4 Clock Modes
The receiver interface is timed to the recovered clock or to the reference clock depending
on the state of the recovered clock enable, RCCE, signal. RCCE asserted enables timing
relative to the recovered clock, and set low enables timing relative to the reference clock.
3.4.1 Recovered Clock Mode
The recovered clock signal, RECV_n_RCLK, is generated by the receiver and, on average,
runs at the reference clock frequency of the transmitter at the other end of the link. The
Table 3-4. Word Synchronization Settings
Mode
Signals
Recommended
State
Description
Word synchronization
WSE
High
Enables word synchronization.
Byte synchronization
BSYNC_0,
BSYNC_1
Any mode
except
non-aligned
Word synchronization depends upon idle character
detection. Byte alignment is required for idle
detection. Any one of the three byte synchronizing
modes may be used.
Add/delete idle
ADIE
High
When enabled, allows the receiver to add/delete idle
patterns to maintain word alignment. This is the
recommended operating mode when the reference
clock is being used to time the receiver interface
(RCCE = Low) and there is a frequency offset
between the transmitter and receiver. Idles are
added or dropped to maintain word alignment.
This is also recommended when the four
transmitters have a frequency offset. (This is a
questionable application, however, it is supported.)
If disabled, a frequency offset will eventually cause
word synchronization to be lost.
10-bit interface
TBIE
dont care
When enabled, the idle character must be part of the
TBI code set.
When disabled, the idle is naturally supported by the
8B/10B codes.
Recovered clock
RCCE
dont care
Does not affect word synchronization.
Half-speed enable
HSE
dont care
Does not affect word synchronization.
Double data rate
DDRE
dont care
Does not affect word synchronization.
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