HB28D032MM2 datasheet(8/90 Pages) RENESAS

8 / 90 page

HB28H016/D032/B064/B128MM2

Rev.5.0, Jan. 2003, page 6 of 88

available on the market. As any other SPI device the MultiMediaCard SPI interface consists of the

following four signals:

CS: Host to card Chip Select signal.

CLK: Host to card clock signal

Data in: Host to card data signal.

Data out: Card to host data signal.

The MultiMediaCard card identification and addressing methods are replaced by a hardware Chip Select

(CS) signal. There are no broadcast commands. For every command, a card (slave) is selected by

asserting (active low) the CS signal (refer to Figure “SPI Bus System”). The CS signal must be

continuously active for the duration of the SPI transaction (command, response and data). The only

exception occurs during card programming, when the host can de-assert the CS signal without affecting the

programming process. The bidirectional CMD and DAT lines are replaced by unidirectional data in and

data out signals. This eliminates the ability of executing commands while data is being read or written and,

therefore, makes the sequential and multi block read/write operations obsolete. The single and multiple

block read/write commands are supported by the SPI channel. The SPI interface uses the same seven

signals of the standard MultiMediaCard bus (refer to Table “SPI Interface Pin Configuration”).

Power

supply

SPI bus (CLK, Datain, Dataout)

SPI bus master

SPI card

SPI Bus System

HB28D032MM2 Datasheet(PDF) 8 Page - Renesas Technology Corp