Core memory driver circuit

The other circuit used half the number of transistors, and wasn't as complex. Well a reason for using CMOS is power consumption. The CMOS circuit uses less than 5 milliamps per bit maximum (when both switches are off and the LED is off, it uses less that a microamp). The other circuit used milliamps per bit (depending on the switches and Estimated Reading Time: 3 mins. Abstract. A quantitative and yield analysis of single bit cache memory architecture has been analysed. Single bit cache memory architecture is made up of a write driver circuit, static random access memory cell, and current mode sense amplifier. Trimmer VR1 sets the half select current. Typically, this varies between and mA, depending on core size. Around mA seems to be about right for this plane, which has quite large cores. Conveniently, since I'm only flipping one core, the X and Y select wires are driven in series. The driver was simulated in LTSpice to estimate rise-time.

A 32 x 32 core memory plane storing bits (or bytes) of data. The small black rings at the intersections of the grid wires, organised in four squares, are the ferrite cores. Magnetic-core memory was the predominant form of random-access computer memory for 20 years between about and Memory drivers and switches are selected on a X-Y matrix basis to minimize cabling (e.g. 15 wires are used to select 1/56 memory drivers in an 8×7 array). The memory drivers and memory switch circuits are AC coupled to the data memory control and selected by a combination of a current pulse and a logic level. Archiving prior contents of the B12 erasable memory We still have the flaw in the core memory stack - the inhibit wire for one of the data bits (bit 16) is an open circuit. In the read portion of a memory cycle, the selected X and Y address lines flip all cores of that word to zero.

circuits after. I. INTRODUCTION. In this short paper, Figure 2: Logic States of Magnetic Core Memories Figure 7: Driving Coincident Currents. The stack was contained in a heavy 19" rack-mount box, together with power supply and driver electronics. A small ring, or core, of ferrite (a ferromagnetic. and transistors are used in core-driving circuits and read-out amplifiers. A typical memory cycle, reading followed immediately by writing.