參數(shù)資料
型號: HB28J128RM3
廠商: Renesas Technology Corp.
英文描述: MultiMediaCard 32 MByte/64 MByte/128 MByte/256 MByte/512 MByte
中文描述: 多媒體32 MByte/64 MByte/128 MByte/256 MByte/512字節(jié)
文件頁數(shù): 27/91頁
文件大?。?/td> 526K
代理商: HB28J128RM3
HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3
Rev.0.02, Sep.15.2004, page 27 of 89
Read, Write and Erase Time-out Conditions
The times after which a time-out condition for read/write/erase operations occurs are (card independent) 10
times longer than the access/program times for these operations given below. A card shall complete the
command within this time period, or give up and return an error message. If the host does not get a
response within the defined time-out it should assume the card is not going to respond anymore and try to
recover (e.g. reset the card, power cycle, reject, etc.). The typical access and program times are defined as
follows:
Read
The read access time is defined as the sum of the two times given by the CSD parameters TAAC and
NSAC (refer to Table
Card Specific Data (CSD)
). These card parameters define the typical delay
between the end bit of the read command and the start bit of the data block. This number is card dependent
and should be used by the host to calculate throughput and the maximal frequency for stream read.
Write
The R2W_FACTOR field in the CSD is used to calculate the typical block program time obtained by
multiplying the read access time by this factor. It applies to all write/erase commands (e.g.
SET(CLEAR)_WRITE_PROTECT, PROGRAM_CSD(CID) and the block write commands). It should be
used by the host to calculate throughput and the maximal frequency for stream write.
Erase
The duration of an erase command will be (order of magnitude) the number of write blocks to be erased
multiplied by the block write delay.
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