Texas Instruments DS125BR401 Evaluation Module DS125BR401EVM DS125BR401EVM 데이터 시트
제품 코드
DS125BR401EVM
Switch Connection Overview
3
Switch Connection Overview
Table 2. Connection and Control Description
Component
Name
Function
IN_B2+, IN_B2-,
IN_B3+, IN_B3-,
IN_B3+, IN_B3-,
J1 to J8
High-speed differential inputs
IN_A0+, IN_A0-,
IN_A1+, IN_A1-,
IN_A1+, IN_A1-,
OUT_B2+, OUT_B2-,
OUT_B3+, OUT_B3-,
OUT_B3+, OUT_B3-,
J9 to J16
High-speed differential outputs
OUT_A0+, OUT_A0-,
OUT_A1+, OUT_A1-,
OUT_A1+, OUT_A1-,
J19
VIN or VDD
DC Power - VIN or VDD to DS125BR401SQ
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)
ENSMB = HIGH – SMBUS (slave mode)
SW2
ENSMB
ENSMB = FLOAT – SMBUS (master mode – load configuration from
EEPROM)
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 1k
MODE – Tie 1k
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 20k
Ω
to GND = SAS-3 and GEN-3 without De-emphasis
Tie 1k
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
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.
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.
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DS125BR401EVM Evaluation Kit
SNLU121 – November 2012
Copyright © 2012, Texas Instruments Incorporated