Datasheet

IEEE 1149.1 Test Access Port (JTAG)
16-6 MCF5206e USER’S MANUAL MOTOROLA
Bits 11-1 JEDEC ID
Indicates the reduced JEDEC ID for Motorola (JEDEC refers to the Joint Electron Device
Engineering Council. Refer to JEDEC publication 106-A and chapter 11 of the IEEE
1149.1 Standard for further information on this field).
Bit 0
Differentiates this register as the JTAG IDcode register (as opposed to the bypass
register) according to the IEEE 1149.1 Standard.
16.3.3 JTAG BOUNDARY-SCAN REGISTER
The MCF5206e model includes an IEEE 1149.1-compliant boundary-scan register. The
boundary-scan register is connected between TDI and TDO when the EXTEST or
SAMPLE/PRELOAD instructions are selected. This register captures signal pin data on
the input pins, forces fixed values on the output signal pins, and selects the direction and
drive characteristics (a logic value or high impedance) of the bidirectional and three-state
signal pins.
Boundary scan bit definitions
The latest (and most accurate) version of the boundary scan bit definitions can be
downloaded from the ColdFire homepage on the Motorola website -
http://www.motorola.com/ColdFire
Please select the ColdFire processor of your choice and search under the product
documentation hypertext button.
16.3.4 JTAG BYPASS REGISTER
The MCF5206e includes an IEEE 1149.1-compliant bypass register, which creates a
single bit shift register path from TDI to the bypass register to TDO when the BYPASS
instruction is selected.
16.4 TAP CONTROLLER
The value of TMS at the rising edge of TCK determines the current state of the TAP
controller. There are basically two paths that the TAP controller can follow: The first, for
executing JTAG instructions; the second, for manipulating JTAG data based on the JTAG
instructions. The various states of the TAP controller are shown in Figure 16-2. For more
detail on each state, refer to the IEEE 1149.1 Standard JTAG document. Do note, though,
that from any state the TAP controller is in, Test-Logic-Reset can be entered if TMS is held
high for at least five rising edges of TCK.
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Freescale Semiconductor, Inc.
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