1.25.9 1.26.8 1.28.12 OTP Memory Controller (OTPC)
OTP memory area is mapped into 32-bit words. Each 32-bit word is part of one packet.Each packet contains a 32-bit header and 32-bit words of payload(data). The number of payload words is defined in the header.
This mapping system allows three important functions for an OTP memory:
-
Gives a flexible size for any type of data
-
Improves the security by identifying and masking key areas to the System bus
-
Provides an easy way to invalidate a packet and create a replacement packet (key, data) while free space is available in OTP
Using The Library
OTPC plib supports the following activities on the user area of the OTP:
-
Create a new packet in the otp area with a given payload
-
Update the payload of an existing user packet
-
Read the payload associated with a packet
-
Lock the packet to prevent any further modification
-
Invalidate a packet to make sure that it is no longer used
-
Hide a packet to prevent reading its payload
Library Interface
OTP Memory Controller peripheral library provides the following interfaces:
Functions
Name | Description |
---|---|
OTPC_Initialize | Initializes given OTPC instancee |
OTPC_WritePacket | Perform an OTPC packet write |
OTPC_UpdatePayload | Updates the payload of a packet |
OTPC_ReadPacket | Reads a User packet from OTPC from a given address |
OTPC_LockPacket | Locks the packet |
OTPC_InvalidatePacket | Invalidates the packet |
OTPC_HidePacket | Hides the packet |
Data types and constants
Name | Type | Description |
---|---|---|
OTPC_PACKET_TYPE | Enum | Identifies user area packet types |
otpc_error_code_t | Enum | Identifies OTPC error codes |
OTPC_NEW_PACKET | Struct | Structure identifying a new OTPC packet |