DSP56857 datasheet(472/662 Pages) FREESCALE

472 / 662 page

JTAG Port Architecture

5685X Digital Signal Controller User Manual, Rev. 4

17-10

Freescale Semiconductor

17.5.2.3 High Z Instruction (HIGHZ)

The HIGHZ instruction enables the single-bit bypass register between TDI and TDO. It is

provided as a public instruction in order to prevent having to drive the output signals back during

circuit board testing. When the HIGHZ instruction is invoked, all output drivers are placed in an

inactive-drive state. HIGHZ asserts internal system reset for the system logic for the duration of

HIGHZ in order to force a predictable internal state while performing external boundary scan

operations.

17.5.3 JTAG Chip Identification (CID) Register

The Chip Identification (CID) register is a 32-bit register providing a unique JTAG ID for the

DSP56853/54/55/57/58. It is offered as a public instruction to allow the manufacturer, part

number, and version of a component to be determined through the TAP. Figure 17-4 illustrates

the CID register configuration.

Figure 17-4. JTAG Chip Identification (CID) Register

The device identification number for the initial release of the 5685x family is $01F5A01D.

CIR = $2

Read

PNUM

MFG

ID 11

MFG

ID 10

MFG

ID 9

MFG

ID 8

MFG

ID 7

MFG

ID 6

MFG

ID 5

MFG

ID 4

MFG

ID 3

MFG

ID 2

MFG

ID 1

MFG

ID 0

Write

Reset

101000

0000011101

CIR = $2

Read

VER

PNUM

Write

Reset

000000

0111110101

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