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HB28D032MM2 датащи(PDF) 85 Page - Renesas Technology Corp

номер детали HB28D032MM2
подробное описание детали  MultiMediaCard 16 MByte/32 MByte/64 MByte/128 MByte
PDF  90 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HB28D032MM2 датащи(HTML) 85 Page - Renesas Technology Corp

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HB28H016/D032/B064/B128MM2
Rev.5.0, Jan. 2003, page 83 of 88
Input
Output
: Invalid
Clock
tPP
VIH
VIL
VOH
VOL
VIH
VIL
tOH
tWH
tWL
tOSU
tISU
tIH
tHL
tLH
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 NSAD the resulting frame
time is T
SAD = 0.8 µs.
The asynchronous access delay of these Hitachi MultiMediaCards is T
AAD = 300 µs
maximum. The resulting memory access time t
AT is the sum of both parts:
t
AT = TAAD + TSAD
with
T
SAD = NSAD/fPP
DAT
CMD
TSAD
tAT
TAAD
command frame
response frame
data
Access Time



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