HB28D032MM2 Renesas Electronics America, HB28D032MM2 Datasheet - Page 8

• Manufacturer Part Number: HB28D032MM2
• Manufacturer: Renesas Electronics America

Specifications of HB28D032MM2

• Lead Free Status / RoHS Status: Compliant

HB28H016/D032/B064/B128MM2
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”).
Rev.5.0, Jan. 2003, page 6 of 88
Power
supply
SPI bus (CLK, Datain, Dataout)
SPI card
SPI Bus System
SPI card
SPI bus master
CS
CS