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MAR7001CS

Radiation Hard 512x9 Bit FIFO

Dynex Semiconductor 

MA7001

MODES OF OPERATION

Single Device Mode:

The single device mode is used with Xl grounded. (See Figure

10). In this mode the retransmit facility may be used to re-read

the data when less than 512 have been performed between

resets.

Width Expansion Mode:

In this mode two or more devices are used, depending on the

word length required, with the same control inputs applied to

each. The same operations are applied to all devices, thus

warning flags EF and FF are available from any or all of the

devices. Output Signals from devices in this mode should not

be merged. Figure 11 illustrates two devices configured in

width expansion mode to give an 18 bitword, (512 x 18).

Depth Expansion Mode:

This has applications where more than 512 words are

required. The RETRANSMIT facility is not available in this

mode.

Two or more devices are organised in a daisy chain. The first

device in the chain has FL grounded, all others have FL in high

states. XO of each device is connected to XI of the next device

in the chain.

The same read, write and reset signals are applied to each

device. External logic is required to form new empty and full

flags, i.e. all EF’s are ORed together and all FF’s are ORed

together to form new empty and full flags respectively.

Figure 12 illustrates depth expansion of 2 devices (1024 x 9).

Figure 10: Single Device Mode (512 x 9 bits)

Figure 11: Width Expansion Mode (512 x 18 bits)

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