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Schottky Transistor Logic Macro Receive Cell

IP.com Disclosure Number: IPCOM000088647D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 101K

Publishing Venue

IBM

Related People

Chen, JZ: AUTHOR [+4]

Abstract

The Schottky transistor logic (STL) macro receive cell (Fig. 1) provides a simple means of relieving the wiring congestion normally encountered in dense LSI (large scale integration) chips designed with functional macros. The cell is designed similar to the standard STL cell (Fig. 2), with the exception of a single 'isolated' diode which can be used as an input or output diode. When used as an output, the cell is equivalent to a standard STL cell with fan-out reduced to four. When used as an input diode, it provides the ability to 'cluster' distant loads and drive these loads with a single metal line.

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Schottky Transistor Logic Macro Receive Cell

The Schottky transistor logic (STL) macro receive cell (Fig. 1) provides a simple means of relieving the wiring congestion normally encountered in dense LSI (large scale integration) chips designed with functional macros. The cell is designed similar to the standard STL cell (Fig. 2), with the exception of a single 'isolated' diode which can be used as an input or output diode. When used as an output, the cell is equivalent to a standard STL cell with fan-out reduced to four. When used as an input diode, it provides the ability to 'cluster' distant loads and drive these loads with a single metal line.

The STL macro receive cell is the same size and shape as the standard STL cell and can, therefore, be sprinkled throughout the chip as required.

Fig. 3 illustrates the normal wiring interconnections necessary between macros with standard STL cells. As can be seen, a separate metal line is required to drive each macro.

As seen from Figs 4 and 5, by incorporating the STL macro receive cell (MRC) into the design, a significant reduction in total wire length is achieved. The output of the standard STL cell is taken directly from the collector of the device, and its output diode, in effect, is transposed to the input of the receive cell.

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