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HB28B128MM2 Datasheet(PDF) 4 Page - Hitachi Semiconductor |
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HB28B128MM2 Datasheet(HTML) 4 Page - Hitachi Semiconductor |
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4 / 88 page  HB28E016/D032/D064/B128MM2 4 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 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. • CMD: is a bidirectional command channel used for card initialization and data transfer commands. 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. • DAT: is a bidirectional data channel with a width of one line. The DAT signal of the MultiMediaCard operates in push pull mode. • RSV: is pulled up with resistor (2 MΩ typ) in the MultiMediaCard. The external pull-up resistor should be recommended if the system requires. MultiMediaCard Host ROD RDAT RCMD 1 2 3 4 5 6 7 MultiMediaCard CMD CLK DAT MultiMediaCard Mode Interface All MultiMediaCards are connected directly to the lines of the MultiMediaCard bus. The following table defines the card contacts. |
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