SH7763 Datasheet, PDF (1393/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 31 Multimedia Card Interface (MMCIF)
(1) Operation of Broadcast Commands
CMD0, CMD1, CMD2, and CMD4 are broadcast commands. These commands and the CMD3
command make up a sequence where relative addresses are assigned to individual cards. In this
sequence, the CMD output format is open drain and the command response is wired-OR. The
transfer clock frequency should be set low enough by dividing the transfer clock for the CLKON
register by 28.
• All cards are initialized to the idle state by CMD0.
• The operation condition registers (OCR) of all cards are read via wired-OR and cards that
cannot operate are deactivated by CMD1.
The cards that are not deactivated enter the ready state.
• The card identification (CID) of each card in the ready state is read via wired-OR through
CMD2.
Each card compares its own CID and data on the CMD, and if they differ, the card
immediately aborts the CID output. One card that has completed its output enters the
acknowledge state. When the R2 response is necessary, set the CTOCR register to H'01.
• A relative address (RCA) is given to the card in the acknowledge state through CMD3.
A card that can acquire an RCA enters the standby state.
• By repeating CMD2 and CMD3, an RCA is given to all cards in the ready state to put the cards
in the standby state.
Note: When requesting the R2 response (a 17-byte command response) in MMC mode, set
CTSEL0 to 1. Setting CTSEL0 to 0 causes a timeout while receiving the response.
(2) Operation of Relative Address Commands
CMD7, CMD9, CMD10, CMD13, CMD15, CMD39, and CMD55 are relative address commands
that address the card through its RCA. The relative address commands are used to read card
administration information and original information, and to change the specific card states.
CMD7 sets one addressed card to the transfer state, and the other cards to the standby state. Only
the card in the transfer state can execute flash-memory operation commands, other than broadcast
or relative-address commands.
Rev. 1.00 Oct. 01, 2007 Page 1327 of 1956
REJ09B0256-0100