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): 76/88頁
文件大?。?/td> 329K
代理商: HB28D032MM2
HB28E016/D032/D064/B128MM2
76
Power on
Each card has its own power on detection circuitry which puts the card into a defined state after the power-
on. No explicit reset signal is necessary. The cards can also be reset by a special software command:
GO_IDLE_STATE (CMD0). In case of emergency the host may also reset the cards by switching the
power supply off and on again.
Power up
detection
command
parser
core
controller
memory
core
V
CC
V
SS
ENABLE
MultiMediaCard controller
CLK CMD
DAT
ASYNC.RESET
Power on Detection
A power on reset is generated on chip as long as V
CC
is below a certain limit. After this reset the command
parser of these Hitachi MultiMediaCards works properly but the access to the memory core is not
guaranteed. So in the power up phase (or when these Hitachi MultiMediaCards are inserted during power
up) the host has to wait after sending SEND_OP_COND (CMD1) for the identification delay before the
ALL_SEND_CID (CMD2) can be interpreted by the card:
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