Datasheet

40.8.2 Data Transfer Operation

The High Speed MultiMedia Card allows several read/write operations (single block, multiple blocks, stream, etc.).

These kinds of transfer can be selected setting the T

ransfer Type (TRTYP) field in the HSMCI Command Register

(HSMCI_CMDR).

In all cases, the block length (BLKLEN field) must be defined either in the HSMCI Mode Register (HSMCI_MR) or in

the HSMCI Block Register (HSMCI_BLKR). This field determines the size of the data block.

Consequent to MMC Specification 3.1, two types of multiple block read (or write) transactions are defined (the host

can use either one at any time):

• Open-ended/Infinite Multiple block read (or write):

The number of blocks for the read (or write) multiple block operation is not defined. The card will continuously

transfer (or program) data blocks until a stop transmission command is received.

• Multiple block read (or write) with predefined block count (since version 3.1 and higher):

The card will transfer (or program) the requested number of data blocks and terminate the transaction. The stop

command is not required at the end of this type of multiple block read (or write), unless terminated with an error.

In order to start a multiple block read (or write) with predefined block count, the host must correctly program the

HSMCI Block Register (HSMCI_BLKR). Otherwise the card will start an open-ended multiple block read. The

BCNT field of the HSMCI_BLKR defines the number of blocks to transfer (from 1 to 65535 blocks).

Programming the value 0 in the BCNT field corresponds to an infinite block transfer.

40.8.3 Read Operation

The following flowchart shows how to read a single block with or without use of DMAC facilities. In this example, a

polling method is used to wait for the end of read. Similarly

, the user can configure the HSMCI Interrupt Enable

SAM E70/S70/V70/V71 Family

High-Speed Multimedia Card Interface (HSMCI)

2019 Microchip Technology Inc.

Datasheet

DS60001527D-page 934