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| 型號(hào)： | 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(yè)數(shù)： | 20/82頁(yè) |
| 文件大?。?/td> | 1056K |
| 代理商： | MC92600 |
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2-6
MC92600 WarpLink Quad Users Manual
Types of Transmission Data
where I+ stands for idle of positive disparity, and I- stands for idle of negative disparity.
The transmitter inputs, XMIT_n_7DXMIT_n_0, XMIT_n_K and XMIT_n_IDLE_B are
ignored for the next 15 byte-times while the sequence is transmitted.
NOTE:
The transmitter control signals WSE_GEN and XMIT_n_K
also affect the receiver. When WSE_GEN is high and
XMIT_n_K is low on all four links, the receiver invalidates its
current byte alignment and word synchronization. See
Section 3.3.2.1, òWord Synchronization Methodó for more
information on this function.
2.4.2 Transmitting Coded Data
10-bit coded data may be transmitted, bypassing the internal 8B/10B encoder. 10-bit
interface (TBI) mode is enabled by asserting TBIE. In this mode, the ten bits of data to
transmit are presented on the XMIT_n_7DXMIT_n_0 inputs, and bits 8 and 9 on the
XMIT_n_K and XMIT_n_IDLE_B inputs, respectively.
Special care must be taken when using TBI mode. The 10-bit data must exhibit the same
properties as 8B/10B coded data. DC balance must be maintained and there must be
sufTcient transition density to ensure reliable data recovery at the receiver. The receiver
requires that the K28.5 idle character be periodically transmitted to enable byte and word
synchronization. This 10-bit pattern (0011111010 or 1100000101, ordered from bit 0
through 9) is used for alignment and link-to-link synchronization when operating in any of
the byte or word synchronization modes. The pattern of idles and data required to achieve
byte or word synchronization depends on the conTguration of the receiver, see
Section 3.3.1, òByte Alignment.ó The appropriate sequence must be applied through the
10-bit interface. The automated facilities to generate idles and word-synchronization events
are disabled in TBI mode.
The WSE_GEN input does not cause the generation of word synchronization events in TBI
Table 2-2. Transmitter Control States
WSE_GEN
XMIT_n_IDLE_B
XMIT_n_K
Description
Low
Dont care
Low
Transmit data present on XMIT_n_7D0 inputs.
High
Dont care
Low (on all four
transmitters)
Transmit data present on XMIT_n_7D0 inputs and
force invalidation of receivers current byte and word
alignment.
Low
Low
High
Transmit idle (K28.5), ignore XMIT_n_7D0 inputs.
Low
High
High
Transmit control present on XMIT_n_7D0 inputs.
High
dont care
High
Transmit disparity-style word synchronization event,
ignore XMIT_n_7D0 inputs.
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