Another UID (UID1, different from UID2) from the fuses 68 may also be selectable through the mux 170.FIG. 5 is a flowchart illustrating operation of one embodiment of the filter 62.The mux 166 may have inputs coupled to the register 172, fixed seeds A and B, and the output of the encryption subcircuit 160.The memory controller 22 may be coupled to the memory 12 during use, and may include one or more configuration registers 38 in an embodiment.
The SEP trust zone may also be referred to as trust zone zero (TZ0) and the CPU trust zone may also be referred to as trust zone one (TZ1).Any interface for invoking the security peripherals may be used.The resulting wrapped key may be stored in the wrapped key register 184 for access by software.FIG. 16 is a block diagram of one embodiment of a system including the SOC shown in FIG. 1.
No support for unaligned memory accesses in the original version of the architecture.
Get best price and read about company and get contact details and address.The peripherals 18 A- 18 B, the SEP 16, and the PMGR 20 may be configured to transmit interrupts for the CPU processors 28.Enhancements for the exception model and memory translation system included the following.Signed Saturating Rounding Doubling Multiply Accumulate, Returning High Half.
The security peripheral 36 A may be coupled to the SEP processor 32, which may also be coupled to the secure mailbox 60 and the power control unit 64.During normal operation, the mux 224 may be selecting the secure key output by the encryption subcircuit 222, and thus the secure key may be input to the encrypting subcircuit 228.Additions to the Advanced SIMD instruction set for both AArch32 and AArch64 to enable opportunities for some library optimizations.In ARM-based machines, peripheral devices are usually attached to the processor by mapping their physical registers into ARM memory space, into the coprocessor space, or by connecting to another device (a bus) that in turn attaches to the processor.Turning now to FIG. 10, a block diagram of one embodiment of the encryption circuit 36 B is shown in greater detail.
The filter 62 may also monitor the outbox to detect a write of data to the outbox by the SEP processor 32 (decision block 98 ).Alternatively, the storage media may be connected to the computer.In response to the write to the outbox 60 B, and interrupt message may be transmitted to the interrupt controller 24, which may interrupt the CPU processor 28.
In the late 1980s Apple Computer and VLSI Technology started working with Acorn on newer versions of the ARM core.Accordingly, the security of the SOC and its ability to resist attacks meant to compromise secure data are becoming increasingly important features.Atmel SAM7L, SAM7S, SAM7SE, SAM7X, SAM7XC, AT91CAP7, AT91M, AT91R.Alternatively, if the SEP 16 includes an authentication unit as one of the security peripherals 36, the instructions may invoke the authentication unit with parameters causing the authentication unit to read the secure ROM 34 and authenticate it.FIG. 12 is a block diagram of one embodiment of a cryptographic peripheral which receives a wrapped key.Fabless licensees, who wish to integrate an ARM core into their own chip design, are usually only interested in acquiring a ready-to-manufacture verified IP core.Once the writes have occurred, the registers may not be updated again until the SOC 10 is powered down and powered up again, or completely reset, such that the contents in the memory 12 (and particularly within the trust zones) has been erased.
The software may provide the encrypted key to the SOC cryptographic unit, which may decrypt the key using the wrapping key to obtain the secure key.In other embodiments, clock gating may be performed in response to the WFI instruction and there may be one idle timer to request power gating.
Atmel has been a precursor design center in the ARM7TDMI-based embedded system.An attribute of the write operation issued by the SEP processor 32 may indicate whether or not the data is to be encrypted.