DS100BR111A_15 Datasheet, PDF (35/51 Pages) Texas Instruments – Ultra Low Power 10.3 Gbps 1-Lane Repeaters with Input Equalization and Output De-Emphasis

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9 Application and Implementation
DS100BR111A
SNLS400D – JANUARY 2012 – REVISED JANUARY 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 OOB (Out-of-Band) Functionality in SAS/SATA Applications
For SAS/SATA systems, a low speed OOB (Out-of-Band) communication sequence is used to detect and
communicate device capabilities between host ASIC and link partners. These OOB signals, including
COMWAKE, COMINIT, COMRESET, and COMSAS, are a series of burst, idle, and negation times transmitted
and detected across the SAS/SATA link. These bursts occur at a rapid rate, with the COMWAKE signal having
the most stringent requirement of 106.6 ns active followed by 106.6 ns idle. Normally, if the MODE pin is left
floating in Slow OOB mode, the device goes idle-to-active in approximately 150 ns. If the device is set to SAS
mode (MODE pin tied via 1 kΩ to VDD (2.5 V mode) or VIN (3.3 V mode)), the device goes idle-to-active in
approximately 3 to 4 ns. This fast idle-to-active time is critical to pass OOB signaling, and when operating in pin
mode, the MODE pin should be tied high. If operating in SMBus slave mode, the user can set Reg 0x28 to 0x4C
for this faster idle-to-active response.
9.2 Typical Application
The DS100BR111A works to extend the reach possible by using active equalization on the channel, boosting
attenuated signals so that they can be more easily recovered at the Rx endpoint. The capability of the repeater
can be explored across a range of data rates and ASIC-to-link-partner signaling, as shown in the following test
setup connections. The test setup connections diagrams shown represent typical generic application scenarios
for the DS100BR111A.
Pattern
Generator
V_OD = 1.0 Vp-p,
DE = 0 dB
PRBS-11
TL
Lossy Channel
IN DS100BR111A OUT
Scope
BW = 60 GHz
Figure 10. Test Setup Connections Diagram
Pre-Channel Only
Pattern
Generator
V_OD = 1.0 Vp-p,
DE = 0 dB
PRBS-11
TL1
Lossy Channel
IN DS100BR111A OUT
TL2
Lossy Channel
Scope
BW = 60 GHz
Figure 11. Test Setup Connections Diagram
Pre-Channel and Post-Channel, No Tx Source De-emphasis
Pattern
Generator
V_OD = 1.0 Vp-p,
DE = -6 dB
PRBS-11
TL1
Lossy Channel
IN DS100BR111A OUT
TL2
Lossy Channel
Scope
BW = 60 GHz
Figure 12. Test Setup Connections Diagram
Pre-Channel and Post-Channel, -6 dB Tx Source De-emphasis
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