To Configure The Jtag Test Clock (Tck) Speed (Communication Speed); Jtag Clock Speed - Agilent Technologies E5900B User Manual

Chapter 7: Configuring the Emulation Probe
Configuration items
To configure the JTAG test clock (TCK) speed
(communication speed)
The emulation probe needs to be configured to communicate at a rate which is
compatible with your target processor. The JTAG clock speed is independent
of processor clock speed.
Target systems that have additional loads on the JTAG lines or do not quite
meet the requirements described in Chapter 2, "Designing a Target System for
an Emulation Probe," may require a slower TCK speed setting.
The speed value is a number followed by either K, which indicates the value is
in kHz, or M, which indicates the value is in MHz. The clock speed ranges are
shown in the table that follows. Not all values in the range are valid; if an
invalid speed is entered, the next slower valid speed will be used.
Entering cf speed without a value will display the current speed.
JTAG clock speed configuration
Command
cf speed=value
JTAG TCK (Test Clock) Speed Configuration
Emulation
Target System Probe Factory
Processor Default TCK
(MHz)
400 12
603e 16
603ei 20
603ev 16
740 30
745, 755 16
750CX 26
*The Manufacturer Spec Max TCK value may be inaccurate due to mask
revisions and other factors. The maximum TCK rate that works with your
target system will be dependent on many factors including signal routing,
signal integrity, and processor architecture.
76 Agilent Technologies Emulation for the PowerPC 400/600/700
Emulation Emulation
Probe Probe
Minimum TCK Maximum TCK
(kHz) (MHz)
11 50
11 50
512 40
11 50
11 50
512 40
11 50
Manufacturer
Spec. Max
TCK (MHz)*
50
50
25
50
50
25
50