User manual

Symbol Parameter Min Max Unit
tJPSU_TDI JTAG port setup
time (TDI)
— 24.42 ns
tJPSU_TMS JTAG port setup
time (TMS)
— 26.43 ns
tJPH JTAG port hold
time
— 17.25 ns
The simulated timing is based on a slow timing model, which is a worst-case scenario environment.
For device-specific JTAG timing information, refer to the related device data sheet.
Figure 2-6: USB-Blaster II Download Cable Timing Constraints
USB Blaster II
MAX
Device
Target Board
FPGA
11.575 ns 11.627 ns
JTAG Cable
JTAG
Header
Your Own
Measurement
Set Input
Delay
Board Traces
Launch/Latch
Registers
Launch/Latch
Registers
If you cannot meet 24 MHz, you must decrease the frequencies to 16-6 MHz. Below is some example code
to set the TCK maximum frequency to 6 MHz:
jtagconfig --setparam 1 JtagClock 6M
Related Information
• Changing the TCK Frequency on page 2-8
• Documentation: Data Sheets
Changing the TCK Frequency
The USB-Blaster II download cable has a default TCK frequency of 24 MHz. Where signal integrity and
timing prevents operating at 24 MHz, change the TCK frequency of the USB-Blaster II:
1. Open the command line interface with the Quartus Prime bin directory in your path (for example, C:\
altera\14.0\quartus\bin64).
2. Type the following command to change the TCK frequency:
jtagconfig --setparam <cable number> JtagClock <frequency><unit prefix>
2-8
Changing the TCK Frequency
UG-01150
2015.12.11
Altera Corporation
USB-Blaster II Download Cable Specifications
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