參數(shù)資料
型號： HB28D032MM2
廠商： Hitachi,Ltd.
英文描述： MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
中文描述： 多媒體16 Mbyte/32 Mbyte/64 Mbyte/128字節(jié)
文件頁數(shù)： 83/88頁
文件大?。?/td> 329K
代理商： HB28D032MM2
HB28E016/D032/D064/B128MM2
83
Input
Output
: Invalid
Clock
t
PP
V
IH
V
IL
V
OH
V
OL
V
IH
V
IL
t
OH
t
WH
t
WL
t
OSU
t
ISU
t
IH
t
HL
t
LH
Valid data
Valid data
Valid data
Timing Diagram of Data Input and Output
The access time (t
AT
) is divided into two parts:
T
SAD
: The synchronous access time. This time defines the time of the maximum number of cycles
which are required to access a byte of the memory field.
T
AAD
: The asynchronous access time to read a byte out of the memory field.
The synchronous part of the access time is sum of the command frame length and some additional internal
cycles (N
SAD
= 16 cycles). At 20 MHz one cycle is 50 ns (1/f
PP
), multiplied with N
SAD
the resulting frame
time is T
SAD
= 0.8
μ
s. The asynchronous access delay of these Hitachi MultiMediaCards is T
AAD
= 300
μ
s
maximum. The resulting memory access time t
AT
is the sum of both parts:
t
AT
= T
AAD
+ T
SAD
with
T
SAD
= N
SAD
/f
PP
DAT
CMD
T
SAD
t
AT
T
AAD
command frame
response frame
data
Access Time
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