HB28K032MM3 Datasheet, PDF (84/91 Pages) Renesas Technology Corp – MultiMediaCard 32 MByte/64 MByte/128 MByte/256 MByte/512 MByte

HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3
Access Time
Parameter
Symbol Typ
Max
Unit
Synchronous access delay cycles N_SAD

16
cycles
Synchronous access delay
T
SAD

0.8
µs
Asynchronous access delay
T
AAD
300

µs
Memory access time
t
AT
300.8 *¹
µs
Note: 1. Refer to Chapter “Read, Write and Erase Time-out Conditions”.
Remark
at 20 MHz clock frequency
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 3.3, 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 numbers (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 10⁶ (“Features”
and “Card Specific Data”).
• 1G is equal to 1M * 1K
Rev.0.02, Sep.15.2004, page 84 of 89