參數(shù)資料
型號(hào)： HB288016MM1
廠商： Hitachi,Ltd.
英文描述： MultiMediaCard 16 MByte
中文描述： 多媒體16字節(jié)
文件頁(yè)數(shù)： 47/79頁(yè)
文件大?。?/td> 233K
代理商： HB288016MM1
HB288016MM1
47
Stream read
The data transfer starts N
AC
clock cycles after the end bit of the host command. The bus transaction is
identical to that of a read block command (refer to Figure “Data Read Timing”). As the data transfer is not
block-oriented, the data stream does not include the CRC checksum. Consequently the host can not check
for data validity. The data stream is terminated by a stop command. The corresponding bus transaction is
identical to the stop command for the multiple read block (refer to Figure “Timing of Stop Command”).
Single or multiple block write
The host selects one card for data write operation by CMD7. The host sets the valid block length for block-
oriented data transfer by CMD16. The host transfers the data with CMD24. The address of the data block
is determined by the argument of this command. This command is responded by the card on the CMD line
as usual. The data transfer from the host starts N
WR
clock cycles after the card response was received. The
write data have CRC check bits to allow the card to check the transferred data for transmission errors. The
card sends the CRC check information as a CRC status to the host (on the data line). The CRC status
contains the information if the write data transfer was non-erroneous (the CRC check did not fail) or not.
In the case of transmission error the card sends a negative CRC status (“101” bin) which forces the host to
retransmit the data. In the case of non-erroneous transmission the card sends a positive CRC status (“010”
bin) and starts the data programming procedure.
S T content CRC E
CMD
DAT
CMD
DAT
Z Z Z
* * * *
* * * *
Z
Z Z S
E S
E
status
busy = 'L'
Z
Z
Z Z Z Z Z Z
Z Z Z Z
CRC E
content
L ... pull down to LOW bit
Host command
N
CR
S T content CRC E
S
Z P
Card response
content
N
WR
Write data
CRC status
Card busy
Z
Host active
Card active
Host active
Host active
Card active
Write data
Timing of The Block Write Command
If the card does not have any more free data receive buffer, the card indicates it by pulling down the data
line to LOW. The card stops pulling down the data line as soon as at least one receive buffer for the
defined data transfer block length becomes free. This signalling does not give any information about the
data write status. This information has to be polled by the status polling command.
相關(guān)PDF資料
PDF描述
HB288096C5 CompactFlash(閃速CompactFlash 卡)
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HB2881000A5 FLASH ATA Card 1 GByte
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HB288160A5 FLASH ATA Card
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參數(shù)描述
HB288032A5 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:FLASH ATA Card
HB288032A6 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:FLASH ATA Card
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HB288032MM1 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:MultiMediaCard 32 MByte
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