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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)： | 21/82頁 |
| 文件大?。?/td> | 1056K |
| 代理商： | MC92600 |
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Chapter 2. WarpLink Transmitter
2-7
Device Operations
mode. However, WSE_GEN does work in conjunction with XMIT_n_K to invalidate
receiver byte alignment and word synchronization as described in the previous section.
2.5 Device Operations
The WarpLink transmitter is comprised of several components whose operations are
described in the following sections.
2.5.1 8B/10B Encoder Operation
The 8B/10B encoder transforms 8-bit data/control characters from the input register into
10-bit transmission characters. The Tbre channel 8B/10B coding standard is followed [1,2].
Running disparity is maintained and the appropriate transmission characters are produced,
maintaining DC balance and sufTcient transition density to allow reliable data recovery at
the receiver. See Appendix 0, ò8B/10B Coding Schemeó for a detailed description of
8B/10B coding.
The inputs to the 8B/10B encoder are the data byte (XMIT_n_7 through XMIT_n_0),
special code signal (XMIT_n_K) and transmit idle signal (XMIT_n_IDLE_B).
Data and legal control bytes are coded according to the 8B/10B method. Illegal control
bytes produce unpredictable transmission characters, leading to disparity and coding errors,
ultimately reducing link reliability.
The 8B/10B encoder produces an idle character of proper running disparity when
XMIT_n_IDLE_B is low, XMIT_n_K is high, and WSE_GEN is low, as indicated in Table
2-2, "Transmitter Control States.ó The 8B/10B encoder is bypassed in TBI mode.
2.5.2 Transmit Driver Operation
The transmit driver drives transmission characters serially across the link. Two bits per
transceiver clock, one each on the rising and falling transceiver clock (rx_clock) edges, are
transmitted differentially from the XLINK_n_P (positve) and XLINK_n_N (negative)
outputs. The rx_clock runs at 625 MHz for 1 Gbps (1.25 gigabaud) operation and at 312.5
MHz for 500 Mbps (625 megabaud) operation.
The transmit driver is a controlled impedance driver. The impedance of the driver is
programmable to 50
W
or 75
W
through the MEDIA signal. Drive impedance is 50
W
when
MEDIA is low and 75
W
when MEDIA is high.
A special loop-back mode is supported for test. Asserting the LBE signal high enables
loop-back mode causing the state being driven on XLINK_n_P/XLINK_n_N to be looped
back to the input ampliTer of the links receiver. Loop-back data is processed the same as
normally received data. Loop-back enables at-speed self-test to be implemented for
production test and for in-system self-test. The loop-back signals are electrically isolated
from the XLINK_n_P/XLINK_n_N output signals. Therefore, if the outputs are shorted, or
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