Jtag_Password Register - STMicroelectronics SPC572L series Reference Manual

RM0400
31 30
R Part Revision Number
W
RESET: PRN
15 14
Part Identification
R
Number
W
RESET: PIN (contd.)
The following table describes the device identification register functions.
Table 968. Device identification register field descriptions
Field
PRN Part Revision Number. Contains the revision number of the part. Value is 0x0.
DC Design Center. Indicates the design center. Value is 0x2B.
PIN Part Identification Number. Contains the part number of the device. Value is 0x306.
Manufacturer Identity Code. Contains the reduced Joint Electron Device Engineering Council
MIC
(JEDEC) ID. Value is 0x020.
IDCODE Register ID. Identifies this register as the device identification register and not the bypass
IDCODE ID
register. Always set to 1.
59.3.4

JTAG_PASSWORD register

The JTAG_PASSWORD register is a 256-bit shift register path from TDI to TDO selected
when the ENABLE_JTAG_PASSWORD instruction is active. The default reset value of the
JTAG_PASSWORD register is 256'b0. The JTAG_PASSWORD register transfers its value
to a parallel hold register on the rising edge of TCK when the TAP controller state machine
is in the Update-DR state. Once the ENABLE_JTAG_PASSWORD instruction is executed,
the register value remains valid until a JTAG reset occurs. The operation of this register is
described in the security documentation.
R
W
Reset:
1. The reset value of JTAG_PASSWORD is 256'b0.
The following table describes the JTAG_PASSWORD register functions.
29 28 27 26
13 12 11 10
Figure 1022. Device identification register
256 ...
(1)
* *
Figure 1023. JTAG_PASSWORD register
DocID027809 Rev 4
25 24 23 22
Design Center
DC
9 8 7 6
Manufacturer Identity Code
MIC
Description
2
JTAG_PASSWORD
*
JTAG Controller (JTAGC)
21 20 19 18
Part Identification Number
PIN
5 4 3 2
1
*
17 16
1 0
1
1
0
*
1735/2058
1742