DS125BR800AEVM Datasheet, PDF (6/18 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – SMA evaluation kit provides a complete high band-width platform to evaluate the signal integrity

Switch Connection Overview
3 Switch Connection Overview
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Component
J1 to J8
J9 to J16
J19
J20
J17
J18
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
Table 2. Connection and Control Description
Name
Function
IN_B2+, IN_B2-,
IN_B3+, IN_B3-,
IN_A0+, IN_A0-,
IN_A1+, IN_A1-,
High-speed differential inputs
OUT_B2+, OUT_B2-,
OUT_B3+, OUT_B3-,
OUT_A0+, OUT_A0-,
OUT_A1+, OUT_A1-,
High-speed differential outputs
VIN or VDD
DC Power - VIN or VDD to DS125BR800A
VIN or VDD
Jumper – VIN or VDD to VIH power
SDA, SCL
Optional SMBUS access pins.
See the datasheet for additional information on SMBUS.
EEPROM
Optional socket for EEPROM
EQB[1:0] or
AD[3:2]
PIN MODE – EQ control for channel B inputs
SMBUS MODE – AD[3:2] device address bits
ENSMB
ENSMB = LOW – PIN MODE
ENSMB = HIGH – SMBUS (slave mode)
ENSMB = FLOAT – SMBUS (master mode – load configuration from
EEPROM)
DEMA[1:0]
PIN MODE – DE control for channel A outputs
SDA/SCL
“ON” position connects SDA and SCL lines to the device pin.
DEMB[1:0] or
AD[1:0]
PIN MODE – DE control for channel B outputs
SMBUS MODE – AD[1:0] device address bits
SD_TH and LPBK - RES
SD_TH – Signal detect threshold level (FLOAT = Default level)
LPBK function for BR401 only (FLOAT = Normal operation)
VDD_SEL and
RESET
VDD_SEL – Enable or disable the internal 3.3V to 2.5V regulator.
RESET – Enable or disable the device (LOW – enable)
EQA[1:0]
PIN MODE – EQ control for channel A inputs
INPUT_EN and
MODE
INPUT_EN – Enable or disable the internal 50 ohm to VDD terminations
MODE – Tie 1 kΩ to GND = GEN 1,2 and SAS 1,2
Float = Auto Mode Select (for PCIe and SAS-3)
Tie 20 kΩ to GND = SAS-3 and GEN-3 without De-emphasis
Tie 1 kΩ to VDD = SAS-3 and GEN-3 with De-emphasis
READ_EN
ENSMB = FLOAT – SMBUS (master mode – load configuration from
EEPROM)
SW6: SD_TH becomes the READ_EN pin.
To start the loading at power up, set SW6 pin 3 to “ON” position (pull to
GND).
To manually control the start, set SW6 pin 1 to “ON” position (pull to VDD)
and push the SW10 button for the high to low transition to start the loading.
When the loading is complete the LED – D1 light should turn OFF.
6
DS125BR800AEVM Evaluation Kit
Copyright © 2013, Texas Instruments Incorporated
SNLU151 – September 2013
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