hb28d064mm2 Renesas Electronics Corporation., hb28d064mm2 Datasheet - Page 76

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

HB28E016/D032/D064/B128MM2
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.
A power on reset is generated on chip as long as V
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:
76
Power up
detection
V
V
CC
SS
ASYNC.RESET
CLK CMD
MultiMediaCard controller
command
parser
Power on Detection
ENABLE
CC
is below a certain limit. After this reset the command
DAT
core
controller
memory
core