MD3331-D32-V3Q18 M-Systems Inc., MD3331-D32-V3Q18 Datasheet - Page 46

• Manufacturer Part Number: MD3331-D32-V3Q18
• Description: Mobile Diskonchip Plus 128Mbits 1.8V I/o
• Manufacturer: M-Systems Inc.

9.6
9.6.1 Standard Interface
When using a standard interface, up to four Mobile DiskOnChip Plus 16MB or up to two Mobile DiskOnChip Plus
32MB devices can be cascaded, for up to 64MB capacity. No external decoding circuitry or system redesign is
required.
ID[1:0] ball values determine the identity of each device. Systems with only one device must configure it as device
0 by setting ID[1:0] to 00H. Additional devices should be configured as device 1, device 2 and device 3 by setting
ID[1:0] to 01H, 10H and 11H, respectively.
Note: As Mobile DiskOnChip Plus 32MB is a dual die comprised of two internally stacked Mobile DiskOnChip
When devices are cascaded, all I/O balls must be wired in common, including the BUSY# output. The ID input balls
should be strapped to VCC or VSS, according to the location of each device. To communicate with a particular
device, its ID must be written into the Device ID Select register (see Section 7.7). Only the device whose ID
corresponds with this value responds to read or write cycles to registers.
Figure 17 illustrates the configuration required to cascade four devices on the host bus. Only the relevant cascading
signals are included in this figure, although all other signals must also be connected.
9.6.2 Multiplexed Interface
When using a multiplexed interface, up to two Mobile DiskOnChip Plus 16MB devices can be cascaded, for up to
32MB capacity. No external decoding circuitry or system redesign is required.
The ID0 ball value determines the identity of each device. Systems with only one device must configure it as device
0 by connecting ID0 to VSS. The second device should be configured as device 1 by connecting ID0 to VCC.
When two devices are cascaded, all I/O balls must be wired in common, including the BUSY# output. To
communicate with a particular device, its ID must be written into the Device ID Select register (see Section 7.7).
Only the device whose ID corresponds with this value responds to read or write cycles to registers.
Note: Mobile DiskOnChip Plus 32MB devices cannot be cascaded in a multiplexed interface.
46
WE#
OE#
CE#
VSS
VSS
Device Cascading
Plus 16MB devices, only two Mobile DiskOnChip Plus 32MB devices may be cascaded.(Only ID0 is used).
ID0
ID1
CE#
OE#
WE#
Figure 17: Cascading Configuration for Four Devices
1st
VCC
VSS
Data Sheet, Rev. 1.7
ID0
ID1
CE#
OE#
WE#
2nd
VSS
VCC
ID0
ID1
CE#
OE#
WE#
Mobile DiskOnChip Plus 16/32MByte 1.8V I/O
3rd
VCC
VCC
ID0
ID1
CE#
OE#
WE#
95-SR-000-10-8L
4th