Password And Device Security Module (Pass) - STMicroelectronics SPC572L series Reference Manual

Password and Device Security Module (PASS)

68 Password and Device Security Module (PASS)
68.1 Introduction
68.1.1 Overview
The Password and device security (PASS) module shown in
password challenges and determines their validity. It also maintains the device security and
access states.
Flash Bus
Debug Port
Peripheral Bus
Interface
68.1.2 Features
The PASS includes these distinctive features:
•
Life cycle status
•
Password comparison
•
JTAG password comparison
68.1.3 Modes of operation
The PASS operates identically in all system modes.
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Figure 1197. PASS module block diagram
Flash
Interface
Password
Comparator
Bus
Interface
DocID027809 Rev 4
Figure
Life
Cycle
Lock Status Generator
DCF Record Storage
Lock 3 Lock 2 Lock 1
Lock 3 Lock 2 Lock 1
Lock 3 Lock 2 Lock 1
Lock 3 Lock 2 Lock 1
RM0400
1197, receives
PASS Module
Lock 0
Lock 0
Lock 0
Lock 0