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ISL36111DRZ-T7 データシート(PDF) 5 Page - Intersil Corporation

部品番号 ISL36111DRZ-T7
部品情報  11.1Gb/s Lane Extender
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL36111DRZ-T7 データシート(HTML) 5 Page - Intersil Corporation

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5
FN6974.0
November 19, 2009
Operation
The ISL36111 is an advanced lane-extender for
high-speed interconnects. A functional diagram of
ISL36111 is shown in Figure 4. In addition to a robust
equalization filter to compensate for channel loss and
restore signal fidelity, the ISL36111 contains unique
integrated features to preserve special signaling
protocols typically broken by other equalizers. The signal
detect function is used to mute the channel output when
the input signal falls below the level determined by the
Detection Threshold (DT) pin voltage. This function is
intended to preserve periods of line silence (“DC idle”).
Furthermore, the output of the Signal Detect/DT
comparator is used as a loss of signal (LOSB) indicator to
indicate the absence of a received signal.
As illustrated in Figure 4, the core of the high-speed
signal path in the ISL36111 is a sophisticated equalizer
followed by a limiting amplifier. The equalizer
compensates for skin loss, dielectric loss, and impedance
discontinuities in the transmission channel. The equalizer
is followed by a limiting amplification stage that provides
a clean output signal with full amplitude swing and fast
rise-fall times for reliable signal decoding in a subsequent
receiver.
Adjustable Equalization Boost
ISL36111 features a settable equalizer for custom signal
restoration. The flexibility of this adjustable
compensation architecture enables signal fidelity to be
optimized based on a given application, providing
support for a wide variety of channel characteristics and
data rates ranging from 2.5Gb/s to 11.1Gb/s. Because
the boost level is externally set rather than internally
adapted, the ISL36111 provides reliable communication
from the very first bit transmitted. There is no time
needed for adaptation and control loop convergence.
Furthermore, there are no pathological data patterns that
will cause the ISL36111 to move to an incorrect boost
level.
Control Pin Boost Setting
The connectivity of the CP pins are used to determine the
boost level of ISL36111. Table 1 defines the mapping
from the 2-bit CP word to the 9 available boost levels.
CML Input and Output Buffers
The input and output buffers for the high-speed data
channel in the ISL36111 are implemented using CML.
Equivalent input and output circuits are shown in
Figures 5 and 6.
Signal
Detector
IN[P]
IN[N]
DT
LOSB
OUT[N]
OUT[P]
Adjustable
Equalizer
Limiting
Amplifier
Output
Driver
FIGURE 4. FUNCTIONAL BLOCK DIAGRAM OF THE ISL36111
TABLE 1. MAPPING BETWEEN BOOST LEVEL AND
CP-PIN CONNECTIVITY
CPA
CPB
BOOST LEVEL
Float
Float
0
Float
GND
1
GND
VDD
2
Float
VDD
3
VDD
Float
4
GND
Float
5
GND
GND
6
VDD
GND
7
VDD
VDD
8
IN[P]
IN[N]
1
st Filter
Stage
VDD
50O
50O
FIGURE 5. CML INPUT EQUIVALENT CIRCUIT FOR
THE ISL36111
Ω
Ω
ISL36111


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