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MC12H064NBCA-2SA00 Datasheet(PDF) 37 Page - Samsung semiconductor |
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MC12H064NBCA-2SA00 Datasheet(HTML) 37 Page - Samsung semiconductor |
37 / 102 page MultiMediaCardTM 37 Sep.22.2005 Revision 0.3 • POWER_CLASS This field contains the 4 bit value of the selected power class for the card. The power classes are defined in Table . The host should be responsible of properly writing this field with the maximum power class it allows the card to use. The card uses this information to, internally, manage the power budget and deliver an optimized performance. This field is 0 after power-on or software reset. • HS_TIMING This field is 0 after power-on, or software reset, thus selecting the backwards compatibility interface timing for the card. If the host writes 1 to this field, the card changes its timing to high speed interface timing (refer to Chapter 5.4.8) • BUS_WIDTH It is set to ‘0’ (1 bit data bus) after power up and can be changed by a SWITCH command. 5.5.5 RCA Register The writable 16-bit relative card address register carries the card address assigned by the host during the card identifica- tion. This address is used for the addressed host-card communication after the card identification procedure. The default value of the RCA register is 0x0001. The value 0x0000 is reserved to set all cards into the Stand-by State with CMD7. 5.5.6 DSR Register The 16-bit driver stage register can be optionally used to improve the bus performance for extended operating conditions (depending on parameters like bus length, transfer rate or number of cards). The CSD register carries the information about the DSR register usage. The default value of the DSR register is 0x404. Bits Description [7:4] Reserved [3:0] Card power class code (See Table 5-29) Value Bus Mode 255-3 Reserved 2 8 bit data bus 1 4 bit data bus 0 1 bit data bus |
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