BLUENRG-2 datasheet(149/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

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3.17

PDM stream processor

The BlueNRG-2 integrates a digital filter for processing PDM stream coming from a digital

microphone and inputting into a GPIO pin. The BlueNRG-2 outputs a 0.8MHz or 1.6MHz

signal into a GPIO pin for providing the digital microphone with a frequency clock.

3.18

System timer (SysTick)

The BlueNRG-2 includes a system timer (SysTick) that can be polled by software or can be

configured to generate an interrupt. SysTick interrupt has its own entry in the vector table

and therefore can have its own handler.

3.19

Public key accelerator (PKA)

The Public Key Accelerator is for the computation of cryptographic public key primitives

through elliptic curve cryptography (ECC) using a predefined prime modulus and a

predefined curve.

3.19.1

PKA functional description

The PKA core is clocked by the system clock divided by two and the PKA memory is

clocked by system clock. This peripheral is addressed through the AHB, so the access

must be at 32-bit or a hard fault is generated on the Cortex M0.

The PKA works on a 1 KB dedicated RAM block located in 0xC0000400.

The main features of the PKA block are:



elliptic curve Diffie-Hellman (ECDH) public-private key pair calculation accelerator



based on the Montgomery method for fast modular multiplications



built-in Montgomery domain inward and outward transformations



AMBA AHB lite slave interface with a reduced command set



single port internal memory available for the system when the BlueNRG-2 PKA is not

using it.

The PKA and the PKA RAM are clock gated by default after reset,. so the clock must be

enabled in CKGEN_SOC before using PKA functionality.

The input data, output data and data verification result have specific locations in the PKA

RAM.

Table 204: PKA RAM data location

Parameter description

PKA RAM offset address

Size (words)

INPUT: ECC K value of kP

0x6C

EOS(1)

INPUT: input point P, coordinate X

0x90

EOS

INPUT: input point P, coordinate Y

0xB4

EOS

OUTPUT: output point P, coordinate X

0x90

EOS

OUTPUT: output point P, coordinate Y

0xB4

EOS

OUTPUT: error value

0x00

Notes:

(1)ECC Operand Size

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