參數(shù)資料
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)
文件頁數(shù): 19/82頁
文件大?。?/td> 1056K
代理商: MC92600
Chapter 2. WarpLink Transmitter
2-5
Types of Transmission Data
NOTE:
When using repeater mode ground all parallel inputs because
input I/Os do not have internal pulldowns.
2.4 Types of Transmission Data
WarpLink can handle both coded and uncoded data.
2.4.1 Transmitting Uncoded Data
Uncoded data is presented in 8-bit bytes to the transmit data input register through the
XMIT_n_7 through XMIT_n_0 signals. The uncoded data is coded into 10-bit transmission
characters using an on-chip 8B/10B encoder. The 8B/10B coding ensures DC balance
across the link and sufTcient transition density to facilitate reliable data recovery. The
XMIT_n_7 through XMIT_n_0 signals are interpreted as data when the XMIT_n_K signal
is low.
The 8B/10B code includes special control codes. Special control codes may be transmitted
by setting the XMIT_n_K high, XMIT_n_IDLE_B high, and WSE_GEN low as indicated
in Table 2-2. The transmit byte is assumed to be a control code in this state. The transmitter
generates an idle character (K28.5) when XMIT_n_K is high, XMIT_n_IDLE_B is low,
and WSE_GEN is low as indicated in Table 2-2. An idle character of proper running
disparity is generated when this state is asserted; the state on the XMIT_n_7 through
XMIT_n_0 signals is ignored. This eases generation of idle characters needed for byte and
word synchronization and allows the link to maintain alignment when transmission of data
is not needed.
When using the device in a system where word alignment is required (see Section 3.5.2,
ò8B/10B Decoder Operationó on page 3-11), it may be desirable to generate disparity-style
word synchronization events. This is especially important where compatibility with older
transceivers is required. A disparity style word synchronization event is generated by
setting WSE_GEN high, XMIT_n_IDLE_B low and XMIT_n_K high for each transmitter
that word synchronization event generation is desired. The transmitter generates one of two
unique 16-character idle (K28.5) sequences depending on the current running disparity:
I+, I+, I-, I-, I+, I-, I+, I-, I+, I-, I+, I-, I+, I-, I+, I-
or
I-, I-, I+, I+, I-, I+, I-, I+, I-, I+, I-, I+, I-, I+, I-, I+
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