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DS125BR800AEVM Datasheet(PDF) 6 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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DS125BR800AEVM Datasheet(HTML) 6 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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6 / 18 page  Switch Connection Overview www.ti.com 3 Switch Connection Overview Table 2. Connection and Control Description Component Name Function IN_B2+, IN_B2-, IN_B3+, IN_B3-, J1 to J8 High-speed differential inputs IN_A0+, IN_A0-, IN_A1+, IN_A1-, OUT_B2+, OUT_B2-, OUT_B3+, OUT_B3-, J9 to J16 High-speed differential outputs OUT_A0+, OUT_A0-, OUT_A1+, OUT_A1-, J19 VIN or VDD DC Power - VIN or VDD to DS125BR800A J20 VIN or VDD Jumper – VIN or VDD to VIH power Optional SMBUS access pins. J17 SDA, SCL See the datasheet for additional information on SMBUS. J18 EEPROM Optional socket for EEPROM EQB[1:0] or PIN MODE – EQ control for channel B inputs SW1 AD[3:2] SMBUS MODE – AD[3:2] device address bits ENSMB = LOW – PIN MODE ENSMB = HIGH – SMBUS (slave mode) SW2 ENSMB ENSMB = FLOAT – SMBUS (master mode – load configuration from EEPROM) SW3 DEMA[1:0] PIN MODE – DE control for channel A outputs SW4 SDA/SCL “ON” position connects SDA and SCL lines to the device pin. DEMB[1:0] or PIN MODE – DE control for channel B outputs SW5 AD[1:0] SMBUS MODE – AD[1:0] device address bits SD_TH – Signal detect threshold level (FLOAT = Default level) SW6 SD_TH and LPBK - RES LPBK function for BR401 only (FLOAT = Normal operation) VDD_SEL and VDD_SEL – Enable or disable the internal 3.3V to 2.5V regulator. SW7 RESET RESET – Enable or disable the device (LOW – enable) SW8 EQA[1:0] PIN MODE – EQ control for channel A inputs INPUT_EN – Enable or disable the internal 50 ohm to VDD terminations MODE – Tie 1 k Ω to GND = GEN 1,2 and SAS 1,2 INPUT_EN and SW9 Float = Auto Mode Select (for PCIe and SAS-3) MODE Tie 20 k Ω to GND = SAS-3 and GEN-3 without De-emphasis Tie 1 k Ω to VDD = SAS-3 and GEN-3 with De-emphasis 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 SW10 READ_EN 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 SNLU151 – September 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated |
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