UM0434 datasheet(263/390 Pages) STMICROELECTRONICS

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External core complex interfaces

UM0434

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The core shifts out a 1 as the first bit on

j_tdo if the Shift_DR state is entered directly from

the test-logic-reset state, per the JTAG specification, and informs any JTAG controller that

an ID register exists on the part. The JTAG ID register is accessed by writing the OCMR

(OnCE command register) with the value 0x02 in OCMD[RS].

The JTAG ID bit, manufacturer ID field, and design center number are fixed by the JTAG

Consortium or Freescale. The version numbers and the 2 msbs of the sequence number are

variable and brought out to external ports. The 8 lsbs of the sequence number are variable

and are strapped internally to track variations in processor deliverables.

Table 188 shows the inputs to the JTAG ID register that are input ports on the core. These

bits can help a customer track revisions of a device using the core.

Table 189 describes the JTAG ID signals.

Table 187.

JTAG register ID fields

Bit field

Type

Description

Value

[31:28]

Variable

Version number

Variable

[27:22]

Fixed

Design center number (e200z3)

01_1111

[21:12]

Variable

Sequence number

Variable

[11:1]

Fixed

Motorola manufacturer ID

000_0000_1110

Fixed

JTAG ID register identification bit

Table 188.

JTAG ID register inputs

Signal name

Type

Description

j_id_sequence[0:1]

JTAG ID register (2 msbs of sequence field)

j_id_version[0:3]

JTAG ID register version field

Table 189.

Descriptions of JTAG ID signals

Signal

I/O

Signal description

j_id_sequence[0:1]

JTAG ID sequence. Corresponds to the two msbs of the 10-bit

sequence number in the JTAG ID register. These inputs are normally

static and are provided for the integrator for further component variation

identification.

j_id_sequence[2:9]

JTAG ID sequence. Internally strapped by EPS to track variations in

processor and module deliverables. Each core deliverable has a unique

sequence number. Additionally, each revision of these modules can be

identified by unique sequence numbers. EPS maintains a database of

the sequence numbers.

j_id_version[0:3]

JTAG ID version. Corresponds to the 4-bit version number in the JTAG

ID register. These inputs are normally static. They are provided to the

customer for strapping to facilitate identification of component variants.

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