Broadcom Corporation

Ronak Subhas Patel

Mark Norman Fullerton

Love Kothari

Walid Nabhane

Veronica Alarcon

Chih-Tsung Hsieh

Hao-zheng Lee

A method for serial interface clock domain crossing includes identifying a data communication command received over a serial interface. An address is decoded to determine whether the address falls within a direct latch address range of a register bank. Data is communicated over the serial interface. A multiplexed output clock is generated, for writing to and reading from the register bank, based on at least one of a current system operating state and a refresh control signal from a host processor.

Clock domain crossing serial interface

Aspects of a clock domain crossing serial interface, direct latching over the serial interface, and response codes are described. In various embodiments, a data communication command received over a serial interface is identified, and an address received over the serial interface is resolved to access a register bank. In a write operation, depending upon whether the address falls within a direct latch address range of the register bank, data may be directly latched into a direct latch register of the register bank or into a first-in-first-out register. For both read and write operations, reference may be made to a status register of the serial interface to identify or mitigate error conditions, and wait times may be relied upon to account for a clock domain crossing. After each of the read and write operations, a response code including a status indictor may be communicated.

Clock domain crossing serial interface, direct latching, and response codes

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Sunnyvale, CA, United States of America

Ronak Subhas Patel