hb28d032bp2 Renesas Electronics Corporation., hb28d032bp2 Datasheet - Page 56

• Manufacturer Part Number: hb28d032bp2
• Description: Mobile Embedded Flash With Multimediacard-tm Interface 16 Mbyte/32 Mbyte
• Manufacturer: Renesas Electronics Corporation.

HB28E016/D032BP2
Redundancy Check (CRC)”). CMD17 (READ_SINGLE_BLOCK) initiates a single block read. CMD18
(READ_MULTIPLE_BLOCK) starts a transfer of several consecutive blocks. Two types of multiple block
read transactions are defined (the host can use either one at any time):
The host can abort reading at any time, within a multiple block operation, regardless of the its type.
Transaction abort is done by sending the stop transmission command.
In case of a data retrieval error, the card will not transmit any data. Instead, a special data error token will
be sent to the host. Figure “Read Operation-Data Error” shows a data read operation which terminated
with an error token rather than a data block.
Data Write Overview
As for the read operation, while in SPI mode these Hitachi Mobile Embedded Flashes support single and
multiple block write commands. Upon reception of a valid write command (CMD24 and CMD25 in the
MultiMediaCard protocol), the card will respond with a response token and will wait for a data block to be
sent from the host. CRC suffix, block length and start address restrictions are (with the exception of the
CSD parameter WRITE_BL_PARTIAL controlling the partial block write option) identical to the read
operation (refer to Figure “Single Block Write Operation”). If a CRC error is detected it will be reported in
the data-response token and the data block will not be programmed.
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• Open-ended Multiple block read
The number of blocks for the read multiple block operation is not defined. The card will
continuously transfer data blocks until a stop transmission command is received.
• Multiple block read with pre-defined block count
The card will transfer the requested number of data blocks and terminate the transaction. Stop
command is not required at the end of this type of multiple block read, unless terminated with an
error. In order to start a multiple block read with pre-defined block count the host must use the
SET_BLOCK_COUNT command (CMD23) immediately preceding the
READ_MULTIPLE_BLOCK (CMD18) command. Otherwise the card will start an open-ended
multiple block read which can be stopped using the STOP_TRANSMISSION command.
Data in
Data out
to card
from
host
command
Read Operation-Data Error
response
to host
from
card
data error
from card to host
data error token
command
Next
command