702560 Spectrum Digital Inc, 702560 Datasheet - Page 22

• Manufacturer Part Number: 702560
• Description: XDS560R USB JTAG Emulator With 20 Pin CTI JTAG Header
• Manufacturer: Spectrum Digital Inc
• Type: USB JTAG Emulatorr

Specifications of 702560

• Contents: Board, Cable
• Ic Product Type: USB JTAG Emulator
• Kit Contents: XDS560R USB JTAG Emulator With CTI JTAG Header, CDROM With Drivers, USB Cable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TI DSPs and JTAG Microcontrollers
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Spectrum Digital, Inc
3.2 Bus Protocol
3-4
The IEEE 1149.1 specification covers the requirements for JTAG bus slave devices
(such as the TMS320C5x family) and provides certain rules, summarized as follows:
__ The TMS/TDI inputs are sampled on the rising edge of the TCK signal of the
__ The TDO output is clocked from the falling edge of the TCK signal of the device
When JTAG devices are daisy-chained together, the TDO of one device has
approximately a half TCK cycle set up to the next device’s TDI signal. This type of
timing scheme minimizes race conditions that would occur if both TDO and TDI
were timed from the same TCK edge. The penalty for this timing scheme is a
reduced TCK frequency.
The IEEE 1149.1 specification does not provide rules for JTAG bus master
(emulator) devices.
device.
XDS560R JTAG Emulator Installation Guide