hb28j128mm3 Renesas Electronics Corporation., hb28j128mm3 Datasheet - Page 83

• Manufacturer Part Number: hb28j128mm3
• Description: Multimediacard 32 Mbyte/64 Mbyte/128 Mbyte/256 Mbyte/512 Mbyte
• Manufacturer: Renesas Electronics Corporation.

HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3
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
typical. The resulting memory access time t
Rev.0.02, Sep.15.2004, page 83 of 89
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.
SAD
t
SAD
AT
Output
= T
= 0.8 s. The asynchronous access delay of these Renesas MultiMediaCards is T
Clock
= 16 cycles). At 20 MHz one cycle is 50 ns (1/f
Input
AAD
command frame
+ T
AT
) is divided into two parts:
SAD
: Invalid
Valid data
with
Timing Diagram of Data Input and Output
t
t
OH
IH
t
WH
T
T
AT
SAD
SAD
is the sum of both parts:
Access Time
= N
SAD
t
/ f
AT
t
PP
PP
t
T
HL
AAD
PP
), multiplied with N
t
WL
t
ISU
t
OSU
response frame
Valid data
Valid data
t
LH
SAD
data
the resulting frame
V
V
V
V
V
V
AAD
IH
IL
IH
IL
OH
OL
= 300 s