ARM JTAG board used in UTU2440

bigtrumpet

                                               
This is JTAG WIGGLER BOARD packaged together with UTU2440 board.
This board is adapted from Macraigor JTAG board.
info below derives from brighsally
J2：JTAG 20 pin interface ( connect to target ARM board )
HC244:buffer chip on this board. pin 2，4，6，8 is connected to ground. Only 4 gates used
LPT: parallel port interface ( connect to host PC )
100R:100 ohm resistor
TDO: LPT-11(BUSY)-100R----TRST : not implemented
TMS: LPT-3(D1)----100R----|>---100R----(J2-7)
TCK: LPT-4(D2)----100R----|>---100R----(J2-9)TDI: LPT-5(D3)----100R----|>---100R----(J2-5)
SRST : not implemented

It is very similar to this schematic, except that the nTRST and nSRST connections are missing.
               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u3/90681/showart_1923447.html