參數(shù)資料
型號： HB28B128MM2
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)： 84/88頁
文件大?。?/td> 329K
代理商： HB28B128MM2
HB28E016/D032/D064/B128MM2
84
Access Time
Parameter
Symbol
Typ
Max
Unit
Remark
Synchronous access delay cycles
N
SAD
T
SAD
T
AAD
t
AT
—
16
cycles
Synchronous access delay
—
0.8
μs
at 20 MHz clock frequency
Asynchronous access delay
300
—
μs
Memory access time
Note:
1. Refer to Chapter “Time-out Condition”.
300.8
—
*
1
μs
at 20 MHz clock frequency
n the CSD are two fields to code the asynchronous and the synchronous access delay time:
TAAC, asynchronous access delay
NSAC, maximum number of cycles for receiving and interpreting of a command frame
The value for the CSD field NSAC is calculated from N
SAD
(maximum: 16 cycles) by division with 100
and rounding up to the next integer:
NSAC = [N
SAD
/100] = [16/100]
NSAC = 0x01
The value for the CSD field TAAC is 1 ms:
TAAC = [T
AAD
] = 1 ms
TAAC = 0x0E
For more details on NSAC and TAAC CSD-entries refer to Chapter “Card Specific Data (CSD)”.
References
[1] The MultiMediaCard, System Specification 3.1, MultiMediaCard Association
Number Representations
decimal numbers: 1234, no special characters
hexadecimal numbers: 0xAB, leading 0x, each digit represents 4 bits.
binary numbers (single bit): ‘0’.
binary number (unsigned bit vector): “100100”.
1k is equal to 1024.
1M is equal to 1k * 1k, except the card capacity. In the card capacity, 1M is equal to 10
6
(“Features”
and “Card Specific Data”).
1G is equal to 1M * 1k
相關(guān)PDF資料
PDF描述
HB28D032MM2 MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
HB28D064MM2 MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
HB28E016MM2 MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
HB28C048A6 FLASH ATA Card
HB28C048C6 CompactFlash⑩
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