MD2241-D128-V3 M-Systems Inc., MD2241-D128-V3 Datasheet - Page 19

• Manufacturer Part Number: MD2241-D128-V3
• Description: Diskonchip Dimm Plus
• Manufacturer: M-Systems Inc.

5.
DiskOnChip DIMM Plus has three modes of operation:
Mode changes can occur due to any of the following events, as shown in Figure 9:
5.1
This is the mode in which standard operations involving the flash memory are performed. Normal mode is
automatically entered when a valid write sequence is sent to the DiskOnChip Control register and Control
Confirmation register.
A write cycle occurs when both the CE# and WE# inputs are asserted. Similarly, a read cycle occurs when both the
CE# and OE# inputs are asserted. Because the flash controller generates its internal clock from these CPU cycles
and some read operations return volatile data, it is essential that the specified timing requirements contained in
19
Power-Down
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Modes of Operation
Normal Mode
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 into Reset mode.
A valid write sequence to the DiskOnChip DIMM Plus Control register and the Control Confirmation
register sets the device in Normal mode.
Power down
A valid write sequence, initiated by software sets the device from Normal Mode into Deep Power Down
Mode and vice versa.
Power-Down
Power Off
Mode
Deep
Assert RSTIN#
Power-Down
Figure 9: Operation Modes and Related Events
Preliminary Data Sheet, Rev. 1.2
Software Control
Software Control
Power-Down
Hardware or
Power-Up
Assert RSTIN#
Normal Mode
Reset Mode
Sequence End
DiskOnChip DIMM Plus
Reset
94-SR-002-08-8L