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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodLVLSHFT™ Reference Manual Revised April 12, 2016 This manual applies to the PmodLVLSHFT rev. B Overview The Digilent PmodLVLSHFT is a digital logic level shifter. This module is ideal for users who want to supply logic signals following a 3.3V CMOS standard but have an alternate logic level output that is used for other applications such as JTAG programming.        Digital logic level shifter Translate logic signals between two user supplied voltage levels 2×7 JTAG header 8 miniature switches to dictate logic level conversion Voltage range between 1.8V and 5.5V Small PCB size for flexible designs 1.8 in × 0.8 in (4.6 cm × 2.0 cm) 12-pin Pmod port with GPIO interface The PmodLVLSHFT. 1 Functional Description The PmodLVLSHFT translates logic signals between two user supplied voltage levels. Users can use a small object such as a pen or a screwdriver to adjust the switches for the direction of the voltage translation. 2 Interfacing with the Pmod The PmodLVLSHFT communicates with the host board via GPIO. Users can supply any form of digital signals to either end of the Pmod and have them translated to the other voltage level. Switches are provided to indicate the direction of the voltage translation. A switch pushed to the left side (green) towards the pin header translates voltages from VCCB to VCCA; a switch on the right side (yellow) towards the JTAG header translates from VCCA to VCCB. DOC#: 502-320 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 1 of 3 PmodLVLSHFT™ Reference Manual Figure 1. Switches indicating the voltage direction. A pinout table for the PmodLVLSHFT is provided below: Header J1 Pin Signal 1 AIO1/TMS 2 AIO2/TDI 3 AIO3/TDO 4 AIO4/TCK 5 GND 6 VCCA 7 AIO5 8 Description A1 & TMS JTAG pin A2 & TDI JTAG pin A3 & TDO JTAG pin A4 & TCK JTAG pin Power Supply Ground Power Supply side A JTAG Header J2 Pin Signal 1 GND 2 VCCB 3 GND 4 BIO1/TMS 5 GND 6 BIO4/TCK I/O pin A5 7 GND AIO6 I/O pin A6 8 BIO3/TDO 9 AIO7 I/O pin A7 9 GND 10 AIO8 I/O pin A8 10 BIO2/TDI 11 GND 11 GND 12 VCCA 12 (NC) 13 GND 14 SRST Power Supply Ground Power Supply side A Description Power Supply Ground Power Supply side B Power Supply Ground B1 & TMS JTAG pin Power Supply Ground B4 & TCK JTAG pin Power Supply Ground B3 & TDO JTAG pin Power Supply Ground B2 & TDI JTAG pin Power Supply Ground Not Connected Power Supply Ground Signal Reset Header J3 Pin Signal Description B1 & TMS JTAG pin B5 & Signal Reset pin B2 & TDI JTAG pin 1 BIO1/TMS 2 BIO5/SRST 3 BIO2/TDI 4 BIO6 I/O pin B6 5 BIO3/TDO B3 & TDO JTAG pin 6 BIO7 I/O pin B7 7 BIO4/TCK B4 & TCK JTAG pin 8 BIO8 I/O pin B8 Header J4 Pin Signal 1 VCCB 2 GND Description Power Supply side B Power Supply Ground Table 1. Pin descriptions for the PmodLVLSHFT. Note* Headers J2 and J3 follow the JTAG pin numbering convention as opposed to the Pmod header numbering convention Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 2 of 3 PmodLVLSHFT™ Reference Manual Any external power applied to the PmodLVLSHFT must be within 1.8V and 5.5V. 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.75 inches long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 3 of 3