410-357-B JTAG-SMT3-NC: SURFACE MOUNT PROG 开发板评估板

410-357-B JTAG-SMT3-NC: SURFACE-MOUNT PROG开发板评估板

Overview

　　The Joint Test Action Group (JTAG)-SMT3-NC is a pact, plete, and fully self-contained surface-mount

　　programming module for Xilinx field-programmable gate arrays (FPGAs). The module can be accessed directly from

　　all Xilinx Tools, including iMPACT, ChipScope?, Vivado, and EDK. Users can load the module directly onto a target

　　board and reflow it like any other ponent.

　　The JTAG-SMT3-NC uses a 3.3V main power supply and independent Vref supplies to drive the JTAG and UART

　　signals. All JTAG signals use high speed 24mA three-state buffers that allow signal voltages from 1.8V to 5.5V, and

　　bus speeds up to 30MBit/sec. All UART signals use high speed 24mA buffers that allow signal voltages from 1.8V to

　　5.5V and bus speeds up to 12Mbaud. The JTAG bus can be shared with other devices as the SMT3-NC signals are

　　held at high impedance, except when actively driven during programming. The SMT3-NC module is CE certified and

　　fully pliant with EU RoHS and REACH directives. The module routes the USB D+ (DP) and D- (DM) signals out to

　　pads, providing the system designer with the ability to choose the type of USB connector and its location on the

　　system board.

　　? Small, plete, all-in-one JTAG

　　programming/debugging solution for Xilinx

　　FPGAs with UART side channel

　　? Compatible with Xilinx Tools

　　? High-Speed USB 2.0 port that can drive JTAG bus

　　up to 30Mbit/sec (frequency settable by user)

　　? Open drain buffer on PS_SRST_B pin allows

　　debugging software to reset the processor core

　　of Xilinx’s Zynq® platform

　　? Dual channel USB controller provides

　　simultaneous access to both JTAG and UART

　　interfaces

　　? Separate Vref for JTAG and UART signals allows

　　each interface to operate at difference voltages

　　(1.8V to 5.5V)

　　? Small form-factor surface-mount module can be

　　directly loaded on target boards

　　? USB D+ and D- signals routed to pads, allowing

　　USB connector to be placed anywhere on the

　　host PCB

　　? VBUS_DETECT pin allows for reduced current

　　consumption when the module isn’t connected

　　to a PC

　　Users can connect JTAG signals directly to the corresponding FPGA signals, as shown in Fig. 1. For best results,

　　mount the module over a ground plane on the host PCB. Although users may run signal traces on top of the host

　　PCB beneath the SMT3-NC, Digilent remends keeping the area immediately beneath the SMT3-NC clear.

　　Note: Keep the impedance between the SMT3-NC and FPGA below 100 Ohms to operate the JTAG at maximum

　　speed. Note: If series resistors are used, they should be placed near the transmitting end in order to minimize

　　reflections.

　　李 进

　　深圳博瑞图电子科技有限公司

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