DS64MB201 Datasheet, PDF (11/28 Pages) Texas Instruments – DS64MB201 Dual Lane 2:1/1:2 Mux/Buffer with Equalization and De-Emphasis

Functional Description
The DS64MB201 is a 2–lane signal conditioning 2:1 multi-
plexer 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 config-
urable 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 re-
ceiver 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 re-
vert 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 1. Equalization Input Select Pins for SIA, SIB and DIN (3–Level Input)
EQA, EQB, EQD
Equalization Level
0
9 dB at 3 GHz
Float (No Connect)
13.5 dB at 3 GHz
1
18.4 dB at 3 GHz
Note: F = Float (No Connect), 1 = High and 0 = Low.
TABLE 2. De-Emphasis Input Select Pins for SOA, SOB and DOUT (3–Level Input)
RATE
DEMA,
DEMB,
DEMD
De-Emphasis DE Pulse Width
Level (typ)
(typ)
VOD (typ)
0/F
0
-3.5 dB
330 ps
VOD = 1000 mVp-p
-2 dB
330 ps
VOD = 1200 mVp-p
0/F
1
-6 dB
330 ps
VOD = 1000 mVp-p
-3 dB
330 ps
VOD = 1200 mVp-p
1/F
0
-3.5 dB
200 ps
VOD = 1000 mVp-p
-2 dB
200 ps
VOD = 1200 mVp-p
1/F
1
-6 dB
200 ps
VOD = 1000 mVp-p
-3 dB
200 ps
VOD = 1200 mVp-p
0/F
F
-9 dB
250 ps
enhanced
VOD = 1200 mVp-p
1/F
F
-12 dB
160 ps
enhanced
VOD = 1200 mVp-p
Note: 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.
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