HB28H016MM2 データシートの表示（PDF） - Renesas Electronics
部品番号
コンポーネント説明
メーカー
HB28H016MM2 Datasheet PDF : 90 Pages
| |||
HB28H016/D032/B064/B128MM2
Access Time
Parameter
Symbol Typ
Synchronous access delay cycles NSAD
—
Synchronous access delay
TSAD
—
Asynchronous access delay
TAAD
300
Memory access time
tAT
300.8
Note: 1. Refer to Chapter “Time-out Condition”.
Max
16
0.8
—
—*1
Unit
cycles
µs
µs
µs
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 NSAD (maximum: 16 cycles) by division with 100
and rounding up to the next integer:
NSAC = [NSAD/100] = [16/100]
• NSAC = 0x01
The value for the CSD field TAAC is 1 ms:
TAAC = [TAAD] = 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 106 (“Features”
and “Card Specific Data”).
• 1G is equal to 1M * 1k
Rev.5.0, Jan. 2003, page 84 of 88
Share Link: 