G -LINK

GLT41016

64K X 16 CMOS DYNAMIC RAM WITH EXTENDED DATA OUTPUT

Dec 1998 (Rev 2.1)

G-Link Technology Corporation

2701Northwestern Parkway

Santa Clara, CA 95051, U.S.A.

G-Link Technology Corporation, Taiwan

2F, No.12, R&D Rd. II, Science-Based Industrial Park,

Hsin Chu, Taiwan, R.O.C.

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Extended Data Output (EDO) Page Mode

The EDO page mode is a kind of page mode with enhanced features. The two major features

of the EDO page mode are as follows.

1. Data output time is extended.

In the EDO page mode, the output data is held to the next CAS cycle‘s falling edge,

instead of the rising edge. For this reason, valid data output time in the EDO page mode is

extended compared with the fast page mode (=data extend function). In the fast page mode,

the data output time becomes shorter as the CAS cycle time becomes shorter. Therefore, in

the EDO page mode, the timing margin in read cycle is larger than of the fast page mode

even if the CAS cycle time becomes shorter.

2. The CAS cycle time in the EDO page mode is shorter than that in the fast page mode.

In the EDO page mode, due to the data extend function, the CAS cycle time can be

shorter than in the fast page mode if the timing margin is the same.

mode is 25ns while that in the fast page mode is 40ns.

In the EDO page mode, read (data out) and write (data in) cycles can be executed

repeatedly during one RAS cycle. The EDO page mode allows both read and write

operations during one cycle, but the performance is equivalent to that of the fast page mode

in that case.