JTAG Pinouts

Pinouts

ARM-20 (used with almost all ARM-based microcontrollers)
ARM-14 (used as a lower pin-count version of ARM-20)
MIPS EJTAG used with all MIPS microcontrollers (mostly embedded devices, can be found on many WiFi devices)
Toshiba MIPS
Philips MIPS
AVR JTAG Compatible with AVR, Altera JTAG, ... (widely used)
Altera ByteBlaster Compatible with AVR, Altera JTAG, ... (widely used)
Maxim MAXQ JTAG Partially compatible with AVR JTAG
Actel FlashPro3 JTAG
PLD-JTAG
Cypress Ultra-isr
Lattice JTAG ispDOWNLOAD 2x5pin
Lattice JTAG ispDOWNLOAD 9pin
TI MSP430
Xilinx JTAG
Xilinx JTAG 9pin

Non-standard manufacturer-specific pinouts

Which JTAG pinout should I choose?

If you are designing with ARM or MIPS microprocessor, we recommend using appropriate JTAG connector (EJTAG or ARM JTAG) to maintain compatibility with development tools. In other cases we recommend you using JTAG connector for manufacturer of your part or AVR/Byteblaster JTAG (which is compatible with many other products) or standard 8pin "PLD" JTAG connector.

Daisy chaining multiple devices

If your design uses multiple devices with JTAG TAP, you must either use separate connector for each device or chain devices. Generally, JTAG supports many devices in single JTAG chain, but many tools are not compatible with this feature. Check tool's documentation before you put devices into chain.