參數(shù)資料
型號: HB288016MM1
廠商: Hitachi,Ltd.
英文描述: MultiMediaCard 16 MByte
中文描述: 多媒體16字節(jié)
文件頁數(shù): 75/79頁
文件大小: 233K
代理商: HB288016MM1
HB288016MM1
75
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
μ
s
μ
s
μ
s
at 20 MHz clock frequency
Asynchronous access delay
300
Memory access time
Note:
1. Refer to Chapter “Time-out Condition”.
300.8
—*
1
at 20 MHz clock frequency
In 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 2.11, 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.
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