Embedded multimedia card using unidirectional data strobe signal, host for controlling the same, and related methods of operation

摘要

An embedded multimedia card (eMMC) comprises a clock channel configured to receive a clock signal from a host, a command channel configured to receive a command from the host, a plurality of data channels configured to transmit data to the host, a data strobe channel configured to transmit a data strobe signal synchronized with the data to the host, and a data strobe control unit configured to selectively enable or generate the data strobe signal according to a protocol control signal.

主权项

1. An embedded multimedia card (eMMC), comprising:
a clock channel configured to receive a clock signal from a host; a command channel configured to receive a command from the host; a plurality of bidirectional data channels configured to transmit read data to the host during a high speed (HS) read operation, and receive write data from the host during a write operation; a unidirectional data strobe channel configured to transmit a data strobe signal to the host synchronously with the read data during the HS read operation; and a data strobe control unit configured to generate the data strobe signal from the clock signal during the HS read operation in response to a protocol control signal received from the host via the command channel, wherein the data strobe control unit is further configured to analyze the protocol control signal, generate a data strobe enable signal in response to the analyzing of the protocol control signal, wherein the data strobe signal is generated with a toggling pattern if the data strobe enable signal is enabled and floats if the data strobe enable signal is disabled, and wherein the data strobe control unit is further configured to enable the data strobe enable signal when the eMMC transmits a cyclic redundancy check (CRC) status response signal to the host corresponding to write data received from the host during a write operation performed using a double data rate (DDR) 400 mode.