Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

jtag_uart bitrate

Hi, what is the theoretical maximum bit rate for jtag_uart ip in sopc? assuming no other IP is using the usb-blaster cable. currently I'm sending data from NiosII to computer using jtag-uart ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

USB Blaster is uses Full Speed USB (FTDI FT245), but the JTAG speed is limited to 6 MHz by the USB Blaster Hardware. Furthermore there is a considerable overhead of the virtual JTAG protocol transferring the UART payload with a word length of 8-Bit only.