參數(shù)資料
型號(hào)： MC92600ZTB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 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(yè)數(shù)： 18/98頁(yè)
文件大小： 1288K
代理商： MC92600ZTB
MOTOROLA
Chapter 2. Transmitter
2-5
Types of Transmission Data
2.4
Types of Transmission Data
The MC92600 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_x_7 through XMIT_x_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 sufcient transition density to facilitate reliable data recovery. The
XMIT_x_7 through XMIT_x_0 signals are interpreted as data when the XMIT_x_K signal
is low.
The 8B/10B code includes special control codes. Special control codes may be transmitted
by setting the XMIT_x_K high, XMIT_x_IDLE 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_x_K is high, XMIT_x_IDLE 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_x_7 through XMIT_x_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,
“8B/10B Decoder Operation”), 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 and XMIT_x_K high for each transmitter for which 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+
where I+ stands for idle of positive disparity, and I- stands for idle of negative disparity.
Table 2-2. Transmitter Control States
WSE_GEN
XMIT_x_IDLE
XMIT_x_K
Description
Low
Don’t care
Low
Transmit data present on XMIT_x_7–0 inputs.
High
Don’t care
Low (on all four
transmitters)
Transmit data present on XMIT_x_7–0 inputs and
force invalidation of receivers’ current byte and word
alignment.
Low
High
Transmit idle (K28.5), ignore XMIT_x_7–0 inputs.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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