hb28b128mm2 Renesas Electronics Corporation., hb28b128mm2 Datasheet - Page 6

• Manufacturer Part Number: hb28b128mm2
• Description: Multimediacard 16 Mbyte/32 Mbyte/64 Mbyte/128 Mbyte
• Manufacturer: Renesas Electronics Corporation.

HB28H016/D032/B064/B128MM2
Interface
These Hitachi MultiMediaCards' interface can operate in two different modes:
• MultiMediaCard mode
• SPI mode
Both modes are using the same pins. The default mode is the MultiMediaCard mode. The SPI mode is
selected by activating (= 0) the CS signal (Pin1) and sending the CMD0.
MultiMediaCard Mode
In the MultiMediaCard mode, all data is transferred over a minimal number of lines:
• CLK: with each cycle of this signal a one-bit transfer on the command and data lines is done. The
• CMD: is a bidirectional command channel used for card initialization and data transfer commands.
• DAT: is a bidirectional data channel with a width of one line. The DAT signal of the MultiMediaCard
• RSV: is pulled up with resistor (2 MΩ typ) in the MultiMediaCard. The external pull-up resistor
All MultiMediaCards are connected directly to the lines of the MultiMediaCard bus. The following table
defines the card contacts.
Rev.5.0, Jan. 2003, page 4 of 88
frequency may vary between zero and the maximum clock frequency. The MultiMediaCard bus master
is free to generate these cycles without restrictions in the range of 0 to 20 MHz.
The CMD signal has two operation modes: open drain for initialization mode and push pull for fast
command transfer. Commands are sent from the MultiMediaCard bus master to the MultiMediaCard
and responses vice versa.
operates in push pull mode.
should be recommended if the system requires.
MultiMediaCard Host
R OD
MultiMediaCard Mode Interface
R DAT
R CMD
MultiMediaCard
1 2 3 4 5 6 7
CLK
CMD
DAT