PM0020 datasheet(46/87 Pages) STMICROELECTRONICS

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JTAG sequence

PM00020

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5.2

TURBO-PROG-ENABLE

Note:

While executing this Turbo Mode instruction, Turbo Mode is not active yet. As such, JTCK

needs to be 10X slower than the system clock. Since the system clock can be anywhere

between 4 MHz to 25 MHz, it is best to run JTCK at 400 kHz or below. Once Turbo Mode is

active, JTCK can be at a much faster frequency (i.e. 10 MHz).

Once Turbo Mode is activated, it can only be disabled by a power down or by taking JTRSTn

to low.

This instruction is NOT IEEE 1149.1 JTAG Standard compliant. There is no direct status

check for the success status.

5.3

IDCODE

5.4

ISC-CONFIGURATION

Table 13.

TURBO-PROG-ENABLE sequence

Step

TAP activity

Comment

Run-Test/Idle

Start

1IR-Scan

Load Turbo Mode Instruction:

"01101 1111 11111111"

Run-Test/Idle

End

Table 14.

IDCODE sequence

Step

TAP Activity

Comment

Run-Test/Idle

Start

IR-Scan

Load 5-bit BYPASS + IDCODE

DR-Scan

Shift out 1-bit BYPASS + IDCODE

Run-Test/Idle

End

Table 15.

ISC-CONFIGURATION sequence

Step

TAP Activity

Comment

Run-Test/Idle

Start

IR-Scan

Load 5-bit BYPASS + ISC-CONFIGURATION

DR-Scan

Shift out 1-bit BYPASS + sector protect, CSx, LVD

Threshold and Lock OTP information

Run-Test/Idle

End

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