Marvell International Limited

Wayne C Datwyler

Gregory Burd

Siu-Hung Fred Au

Tze Lei Poo

Minda Zhang

Daniel R Pinvidic

Leonard J Galasso

Hunardi Hudiono

A storage drive includes a first memory that stores first text. A first processor generates a first instruction to decrypt the first text. A cryptographic module includes a second memory, a cryptographic device, a memory module, and a second processor. The second memory is inaccessible to the first processor and stores a cryptographic key. The cryptographic device accesses the second memory to obtain the cryptographic key and based on the first instruction, decrypts the first text. The memory module stores a status of execution of the first instruction by the cryptographic device. The second processor, prior to the cryptographic device decrypting the first text, forwards the first instruction to the cryptographic device and stores the status of execution of the first instruction in the memory module. The memory module is connected between the first and second processors and isolates the first processor from the second processor.

Method and storage device for isolating and preventing access to processor and memory used in decryption of text

Cryptographic apparatus having corresponding methods and computer-readable media comprise: a mailbox memory module to store cryptographic commands received from a client over a client bus, wherein the client is external to the cryptographic apparatus; and a secure processor to obtain the cryptographic commands from the mailbox memory module over a first secure internal bus, execute the cryptographic commands, and store a status of execution of the cryptographic commands in the mailbox memory module over the first secure internal bus, wherein the client obtains the status of the cryptographic commands from the mailbox memory module over the client bus.

Cryptographic module with secure processor

A device includes a data path configured to transfer data from a read channel device to a host. A read gate delay module is configured to receive a first read gate signal, to output a second read gate signal to the read channel device based on the first read gate signal, and selectively delay a transition of the second read gate signal between an asserted state and a non-asserted state based on a data sector size of a data segment and positive and negative edges of a write clock.

Method and system for read gate timing control for storage controllers

A disk controller that controls data transfer between a storage device and a host system is provided. The disk controller includes logic having a state machine that controls de-assertion of a read gate signal based on sector size and/or whether a data segment is split or non-split. The read gate signal is de-asserted at programmable times, based on data sector size. The state machine interfaces with a register whose settings indicate to the state machine that next time when the state machine starts executing from an idle state it should process a second half of a split sector. The state machine also uses a register that to extend assertion of the read gate signal. It is noteworthy that the read gate signal is controlled on a positive and negative edge of a write clock signal.

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Mission Viejo, CA, United States of America

Wayne C Datwyler