hb28d064mm2 Renesas Electronics Corporation., hb28d064mm2 Datasheet - Page 83

• Manufacturer Part Number: hb28d064mm2
• Description: Multimediacard 16 Mbyte/32 Mbyte/64 Mbyte/128 Mbyte
• Manufacturer: Renesas Electronics Corporation.

The access time (t
The synchronous part of the access time is sum of the command frame length and some additional internal
cycles (N
time is T
maximum. The resulting memory access time t
T
which are required to access a byte of the memory field.
T
SAD
AAD
CMD
DAT
: The synchronous access time. This time defines the time of the maximum number of cycles
: The asynchronous access time to read a byte out of the memory field.
t
SAD
SAD
AT
Output
= T
Clock
= 0.8 s. The asynchronous access delay of these Hitachi MultiMediaCards is T
Input
= 16 cycles). At 20 MHz one cycle is 50 ns (1/f
AAD
command frame
AT
+ T
) is divided into two parts:
SAD
: Invalid
Valid data
with
Timing Diagram of Data Input and Output
t
t
OH
IH
t
WH
T
SAD
T
SAD
= N
Access Time
AT
is the sum of both parts:
SAD
/f
t
AT
t
PP
PP
HB28E016/D032/D064/B128MM2
t
T
HL
AAD
PP
t
WL
), multiplied with N
t
ISU
t
OSU
response frame
Valid data
Valid data
t
LH
data
SAD
the resulting frame
V
V
V
V
V
V
IH
IL
IH
IL
OH
OL
AAD
= 300 s
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