參數(shù)資料
型號： HB28D064MM2
廠商： Hitachi,Ltd.
英文描述： MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
中文描述： 多媒體16 Mbyte/32 Mbyte/64 Mbyte/128字節(jié)
文件頁數(shù)： 35/88頁
文件大?。?/td> 329K
代理商： HB28D064MM2
HB28E016/D032/D064/B128MM2
35
with an end bit (HIGH). The data transmission is synchronous to the clock signal. The payload for block-
oriented data transfer is preserved by a 16-bit CRC check sum (refer to Chapter “Cyclic Redundancy Check
(CRC)”).
Stream read
There is a stream oriented data transfer controlled by READ_DAT_UNTIL_STOP (CMD11). This
command instructs the card to send its payload, starting at a specified address, until the host sends a
STOP_TRANSMISSION command (CMD12). The stop command has an execution delay due to the serial
command transmission. The data transfer stops after the end bit of the stop command. If the end of the
memory range is reached while sending data and no stop command has been sent yet by the host, the
contents of the further transferred payload is undefined. The maximum clock frequency for stream read
operation is given by the following formula:
max. speed = min (TRAN_SPEED, (8*2
READ_BL_LEN
-NSAC)/TAAC),
= min (20, (8*2
9
)
100 [cycles])/1000 [
μ
s]) [MHz]
= min (20, 3.996) 3.996 [MHz]
hese parameters being defined in Chapter “Registers”. If the host attempts to use a higher frequency, the
card may not be able to sustain data transfer. If this happens, the card will set the UNDERRUN error bit in
the status register, abort the transmission and wait in the data state for a stop command.
Block read
The basic unit of data transfer is a block whose maximum size is defined in the CSD (READ_BLK_LEN).
READ_BLK_PARTIAL is set, thus smaller blocks whose starting and ending address are wholly contained
within one physical block (as defined by READ_BLK_LEN) may also be transmitted. A 16-bit CRC is
appended to the end of each block ensuring data transfer integrity. READ_SINGLE_BLOCK (CMD17)
starts a block read and after a complete transfer the card goes back to Transfer State.
READ_MULTIPLE_BLOCK (CMD18) 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):
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, terminate the transaction and return to
transfer state. 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.
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.
相關(guān)PDF資料
PDF描述
HB28E016MM2 MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
HB28C048A6 FLASH ATA Card
HB28C048C6 CompactFlash⑩
HB28C016A6 FLASH ATA Card
HB28C016C6 CompactFlash⑩
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HB2A102K-S265B 制造商:Hitano Enterprise Corp 功能描述:Bulk
HB2A102K-S565B 制造商:Hitano Enterprise Corp 功能描述:Bulk
HB2A103K-S565B 制造商:Hitano Enterprise Corp 功能描述:
HB2A122K-S265B 制造商:Hitano Enterprise Corp 功能描述:
HB2A122K-S565B 制造商:Hitano Enterprise Corp 功能描述:Bulk
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*