參數(shù)資料
型號(hào)： MC92610VF
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PBGA324
封裝： 19 X 19 MM, 1.76 MM HEIGHT, 1 MM PITCH, PLASTIC, MS-034AAG-1, MAPBGA-324
文件頁(yè)數(shù)： 26/104頁(yè)
文件大小： 1595K
代理商： MC92610VF
2-8
MC92610 SERDES User’s Manual
MOTOROLA
Functional Description
are produced, maintaining DC balance and sufficient transition density to allow reliable
data recovery at the receiver.
The inputs to the 8B/10B Encoder are the data byte (XMIT_x_7-XMIT_x_0), special code
signal (XMIT_x_K) and transmit Idle signal (XMIT_x_IDLE).
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 (K28.5) of proper running disparity when
XMIT_x_IDLE is low and XMIT_x_K is high, as indicated in Table 2-2.
The 8B/10B Encoder is bypassed in TBI mode.
2.3.1.7
Transmit Driver Operation
The Transmit Driver drives transmission characters serially across the link. There are two
transmit drivers per transmitter, the primary driver for outputs XLINK_x0_P /
XLINK_x0_N, and the redundant driver for outputs XLINK_x1_P / XLINK_x1_N.
Each bit of coded data is transmitted differentially out of the enabled driver. The primary
driver outputs, XLINK_x0_P / XLINK_x0_N, are enabled by asserting XCVR_x_RSEL
low. The redundant driver outputs, XLINK_x1_P / XLINK_x1_N, are enabled by asserting
XCVR_x_RSEL high.
Broadcast mode is enabled by asserting XMIT_EN_ALL high. In broadcast mode, all
primary and redundant link outputs of all four transmitters are enabled, independent of the
asserting the XCVR_x_RSEL signals. When XMIT_EN_ALL is low, only the selected link
driver is active as described previously.
Both the primary and redundant link outputs are disabled when the transceiver is disabled
by asserting XCVR_x_DISABLE high.
2.3.1.8
Transmit Equalization
The Transmit Driver is a 50
controlled impedance driver. The media over which the
signals are transmit, has high-frequency loss that contributes significantly to a distortion
known as Inter-Symbol Interference (ISI). In order to offset, or equalize, the loss at high
frequency, the MC92610’s Transmit Drivers provide additional gain at high frequencies.
This is termed Transmit Equalization. Transmit equalization has the greatest benefit when
driving longer lengths of coax or when traversing across a large backplane. Transmit
equalization is of less benefit for short links. Transmit equalization is enabled by asserting
XMIT_EQ_EN high.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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