NXP Semiconductors MPC5644A, Reference Manual, Page: 1662 / 1735

JTAG Controller (JTAGC)
MPC5644A Microcontroller Reference Manual, Rev. 6
1662 Freescale Semiconductor
36.4.1.3 Device Identification Register
The device identification register, shown in Figure 36-3 , allows the revision number, part number,
manufacturer, and design center responsible for the design of the part to be determined through the TAP.
The device identification register is selected for serial data transfer between TDI and TDO when the
IDCODE instruction is active. Entry into the Capture-DR state while the device identification register is
selected loads the IDCODE into the shift register to be shifted out on TDO in the Shift-DR state. No action
occurs in the Update-DR state. The part revision number (PRN) and part identification number (PIN) fields
are system plugs, and the manufacturer identity code (MIC) is a constant value assigned to the
manufacturer by the JEDEC.
The shift register LSB is forced to logic 1 on the rising edge of TCK following entry into the Capture-DR
state. Therefore, the first bit to be shifted out after selecting the IDCODE register is always a logic 1. The
remaining 31 bits are forced to the value of the device identification register on the rising edge of TCK
following entry into the Capture-DR state.
Figure 36-3. Device Identification Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R Part Revision Number Design Center Part Identification Number
W
Reset PRN DC PIN
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R Part Identification Number Manufacturer Identity Code 1
W
Reset PIN (cont’d) —
1
1
See Table 36-2 for value.
— — — — — — — — — — 1
= Reserved
Table 36-5. Device identification register field descriptions
Field Description
31–28
PRN
Part Revision Number
Bits [31:28] contain the revision number of the part.
27–22
DC
Design Center
Bits [27:22] indicate the design center.
21–12
PIN
Part Identification Number
Bits [21:12] contain the part number of the device.