HB28B064MM2 RENESAS [Renesas Technology Corp], HB28B064MM2 Datasheet - Page 86
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HB28B064MM2
Manufacturer Part Number
HB28B064MM2
Description
MultiMediaCard 16 MByte/32 MByte/64 MByte/128 MByte
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HB28B064MM2.pdf
(90 pages)
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HB28H016/D032/B064/B128MM2
Access Time
Parameter
Synchronous access delay cycles
Synchronous access delay
Asynchronous access delay
Memory access time
Note:
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
and rounding up to the next integer:
• NSAC = 0x01
The value for the CSD field TAAC is 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
• 1G is equal to 1M * 1k
Rev.5.0, Jan. 2003, page 84 of 88
and “Card Specific Data”).
1. Refer to Chapter “Time-out Condition”.
NSAC = [N
TAAC = [T
AAD
SAD
] = 1 ms
/100] = [16/100]
Symbol
N
T
T
t
AT
SAD
AAD
SAD
Typ
—
—
300
300.8
SAD
Max
16
0.8
—
—*
(maximum: 16 cycles) by division with 100
1
Unit
cycles
µs
µs
µs
Remark
at 20 MHz clock frequency
at 20 MHz clock frequency
6
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