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SPEAr1310

One-time programmable antifuse (OTP)

Doc ID 17528 Rev 4

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One-time programmable antifuse (OTP)

The OTP block is an array of one-time programmable antifuse memory cells.

All OTP banks feature an embedded charge pump which provides internally the high voltage

necessary for antifuse programming sessions. Therefore, it is not necessary to use an

additional high voltage pad at the chip interface. OTP is software programmable, so no

dedicated programming interface is needed at chip level.

31.1

Main features

OTP embeds three 255-bit banks, with these features:

●

BANK 1: 255-bit data bank with write-protect mechanism

●

BANK 2: 255-bit data bank with write-protect mechanism

●

BANK M: 255-bit bank, logically partitioned as follows:

–

32 bits (16 + redundancy) used for BANK1/BANK2 write protection

–

4 bits ( 2 + redundancy) reserved for selecting usage of 2 following sections (ID

and key)

–

72 bits free or reserved for USB/PCI ID data (64 + ECC)

–

137 bits free or reserved for key storage (128 + ECC)

–

2 bits ( 1 + redundancy) reserved for disabling ARM debug feature

–

8 bits reserved

SPEAR1310 데이터시트(PDF) 47 Page - STMicroelectronics