hb28d032bp2 Renesas Electronics Corporation., hb28d032bp2 Datasheet - Page 85
hb28d032bp2
Manufacturer Part Number
hb28d032bp2
Description
Mobile Embedded Flash With Multimediacard-tm Interface 16 Mbyte/32 Mbyte
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HB28D032BP2.pdf
(90 pages)
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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:
The value for the CSD field NSAC is calculated from N
and rounding up to the next integer:
The value for the CSD field TAAC is 1 ms:
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
TAAC, asynchronous access delay
NSAC, maximum number of cycles for receiving and interpreting of a command frame
NSAC = 0x01
TAAC = 0x0E
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
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
—
—*
1
(maximum: 16 cycles) by division with 100
Unit
cycles
µs
µs
µs
HB28E016/D032BP2
Remark
at 20 MHz clock frequency
at 20 MHz clock frequency
85
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