MD3331-D64-V3 M-Systems Inc., MD3331-D64-V3 Datasheet - Page 29

• Manufacturer Part Number: MD3331-D64-V3
• Description: Diskonchip Millennium Plus
• Manufacturer: M-Systems Inc.

5.
DiskOnChip Millennium Plus has three modes of operation:
Mode changes can occur due to any of the following events, as shown in Figure 13:
------ For DiskOnChip Millennium Plus 16MB only.
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Power-Down
Modes of Operation
Reset
Normal
Deep Power-Down.
Assertion of the RSTIN# signal sets the device in Reset mode.
During power-up, boot detector circuitry sets the device in Reset mode.
A valid write sequence to DiskOnChip sets the device in Normal mode. This is done automatically by the
TrueFFS driver on power-up (Reset sequence end).
Switching back from Normal mode to Reset mode can be done by a valid write sequence to DiskOnChip,
or by triggering the boot detector circuitry (by soft reset).
Power-down.
A valid write sequence, initiated by software, sets the device from Normal mode to Deep Power-Down
mode. Four read cycles from offset 0x1FFF set the device back to Normal mode. Alternately, the device
can be set back to Normal mode with an extended access time during a read from the Programmable Boot
Block (see Section 10.4.1 for read cycle timing).
Asserting the RSTIN# signal and holding it in this state while in Normal mode puts the device in Deep
Power-Down mode. When the RSTIN# signal is released, the device is set in Reset mode. (This is shown in
the diagram as the dotted arrow.) Please note that this mode transition is valid for 16MB devices only.
Power Off
Power-Down
Mode
Deep
Power-Down
Assert RSTIN#
Figure 13: Operation Modes and Related Events
Release RSTIN#
4x Read Cycles from
extended read cycle
Data Sheet, Rev. 1.7
Software Control
offset 0x1FFF or
Assert RSTIN#
Power-Down
Power-Up
Software Control
Assert RSTIN#,
Boot Detect or
DiskOnChip Millennium Plus 16/32/64MByte
Normal Mode
Reset Mode
Sequence
Reset
End
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