ST33TPHF20SPI datasheet(19/47 Pages) STMICROELECTRONICS

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FIPS140-2 SECURITY POLICY

Page 19 of 47

NON-PROPRIETARY DOCUMENT



Zeroize all CSPs listed in Table 17: Keys and CSPs list that could potentially be used

by FIPS non-approved algorithms in FIPS approved mode

1.7.4

Limited and error modes

TPM may reach specific states depending on sequence of operation that occurred.

1.7.4.1

Shutdown mode

The shutdown mode is an infinite HW reset loop that may be exit only by a power-off/power-

on sequence. This state is entered when TPM detects that a FW integrity check failed during

the TPM boot sequence.

1.7.4.2

Failure mode

Failure mode is a state of TPM that restricts the commands that can be executed to

TPM2_GetCapability / TPM2_GetTestResult. TPM answers to all other commands with a

specific error code: TPM_RC_FAILURE (0x101). This state is entered when one (except FW

integrity test) of the self-tests fails.

1.7.4.3

Reduced mode

The reduced mode is a specific state of the field upgrade mode (refer to §6) that can be

reached if the on-going field upgrade procedure failed due to an error detected in the field

upgrade commands received. In reduced mode, only a subset of commands might be

executed: TPM2_FieldUpgradeStart / TPM2_FieldUpgradeData / TPM2_GetCapability /

TPM2_GetTestResult / TPM2_SelfTest. TPM answers to all other commands with the error

TPM_RC_COMMAND_CODE (0x143). Reduced mode can be exited in case of the reception

of a successful TPM2_FieldUpgradeStart command that reloads the previous installed

firmware.

1.8

Ports and interfaces

The physical port of the security module is the SPI bus or I2C Bus. The logical interfaces and

their mapping to physical ports of the module are described below:

Table 14 : Ports and interfaces

Logical interface

Description

Physical port

Control Input

Interface

Control Input commands

issued to the security

module

SPI : SPI_CS / SPI_CLK / MOSI /

SPI_RST / PP

I2C : SCL / SDA / RESET / PP

Status Output

Interface

Status data output by the

chip

SPI : SPI_CS / SPI_CLK / MISO /

SPI_PIRQ

I2C : SCL / SDA / PIRQ

Data Input Interface

Data provided to the chip

as part of the data

processing commands

SPI : SPI_CS / SPI_CLK / MOSI

I2C : SCL / SDA

Data Output

Interface

Data output by the chip as

part of the data processing

command

SPI : SPI_CS / SPI_CLK / MISO

I2C : SCL / SDA

Power interface

Power interface of the chip

VPS / GND

Here are some details concerning the ports and interfaces of TPM:

The module does not include a maintenance interface.

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