BLUENRG-2 datasheet(150/190 Pages) STMICROELECTRONICS

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Functional details

BlueNRG-2

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DocID030675 Rev 2

An error value of 1 indicates that input point P does not satisfy the curve equation; in this

case, the computation is very short. If the calculation returns an error value of 0, the result

is valid.

The maximum length of data is calculated by:

Max. EOS = ( max_ecc_size / word_size) + 1

If ECC P256 is used, the PKA core needs an operand of 9 (256/32 + 1) words. When

loading a 256-bit (8 word) input, an additional word is requested and must be filled with

zero.

The starting point P for the computation is:



PX = (0x6B17D1F2, 0xE12C4247, 0xF8BCE6E5, 0x63A440F2, 0x77037D81,

0x2DEB33A0, 0xF4A13945, 0xD898C296)



PY = (0x4FE342E2, 0xFE1A7F9B, 0x8EE7EB4A, 0x7C0F9E16, 0x2BCE3357,

0x6B315ECE, 0xCBB64068, 0x37BF51F5)

3.19.2

PKA registers

PKA peripheral base address (PKA_BASE_ADDR) 0xC0000000

Table 205: PKA registers

Address offset

Name

Reset

Description

0x00

CSR

0x00000002

Command and status register

0x04

ISR

0x00000000

Interrupt status register

0x08

IEN

0x00000000

Interrupt enable register

Table 206: PKA

– CSR register description: address offset PKA_BASE_ADDR+0x00

Bit

Field name

Reset

Description

PKA start processing command:



0: has no effect.



1: starts the processing.

After this bitfield is set to 1, it must be written back to 0

manually.

READY

PKA readiness status:



0: the PKA is computing. It is not ready.



1: the PKA is ready to start a new process.

The rising edge of the READY bit set the PROC_END flag in

the ISR register.

6:2

RESERVED

0x00

RESERVED

SFT_RST

PKA software reset:



0: has no effect.



1: reset the PKA peripheral.

After this bitfield is set to 1, it must be written back to 0

manually.

31:8

RESERVED

0x00

RESERVED

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