DS64MB201_13 Datasheet, PDF (11/32 Pages) Texas Instruments – Dual Lane 2:1/1:2 Mux/Buffer with Equalization and De-Emphasis

DS64MB201
www.ti.com
SNLS307E – JANUARY 2011 – REVISED JULY 2013
Functional Description
The DS64MB201 is a 2–lane signal conditioning 2:1 multiplexer and 1:2 switch or fan-out buffer optimized for
PCB FR4 trace and cable interconnects up to 6 Gbps data rate. The DS64MB201 operates in two modes: Pin
Control Mode (ENSMB = 0) and SMBus Mode (ENSMB = 1).
Pin Control Mode:
When in pin mode (ENSMB = 0) , the transceiver is configurable with external pins. Equalization and de-
emphasis can be selected via pin for each side independently. When de-emphasis is asserted VOD is
automatically increased per the De-Emphasis table below for improved performance over lossy media. Rate
optimization is also pin controllable, with pin selections for 3 Gbps, 6 Gbps, and auto detect. The receiver
electrical idle detect threshold is also programmable via an optional external resistor on the SD_TH pin.
SMBUS Mode:
When in SMBus mode the VOD amplitude level, equalization and de-emphasis are all programmable on a
individual lane basis, instead of grouped by sides as in the pin mode case. Upon assertion of ENSMB pins EQx
and DEMx functions revert to register control immediately. The EQx and DEMx pins are converted to AD0-AD3
SMBus address pins. The other external control pins remain active unless their respective registers are written
to, in which case they are ignored until ENSMB is driven low. On power-up and when ENSMB is driven low all
registers are reset to their default state.
Table 2. Equalization Input Select Pins for SIA, SIB and DIN (3–Level Input)
EQA, EQB, EQD⁽¹⁾
Equalization Level
0
9 dB at 3 GHz
Float (No Connect)
13.5 dB at 3 GHz
1
18.4 dB at 3 GHz
(1) F = Float (No Connect), 1 = High and 0 = Low.
RATE ⁽¹⁾
0/F
0/F
1/F
1/F
0/F
1/F
Table 3. De-Emphasis Input Select Pins for SOA, SOB and DOUT (3–Level Input)
DEMA,
DEMB,
DEMD
0
1
0
1
F
F
De-Emphasis DE Pulse Width
Level (typ)
(typ)
-3.5 dB
-2 dB
-6 dB
-3 dB
-3.5 dB
-2 dB
-6 dB
-3 dB
-9 dB
-12 dB
330 ps
330 ps
330 ps
330 ps
200 ps
200 ps
200 ps
200 ps
250 ps enhanced
160 ps enhanced
VOD (typ)
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1200 mVp-p
VOD = 1200 mVp-p
(1) F = Float (No Connect), 1 = High and 0 = Low. Enhanced DE pulse width provides de-empahsis on second bit. When RATE = F (auto
rate detection active), the DE level and pulse width settings follow detected rate. RATE = 0 is 3 Gbps and RATE = 1 is 6 Gbps. De-
emphasis should only be used with VOD = 1000 mVp-p or 1200 mVp-p. VOD less then 1000 mVp-p is not recommended with de-
emphasis. Please refer to VOD1 and VOD0 pin description to set the output differential voltage level.
Copyright © 2011–2013, Texas Instruments Incorporated
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