2024-05-15

📅 Wednesday, May 15th, 2024

We are all faced with a series of great opportunities brilliantly disguised as impossible situations.

— Chuck Swindoll

ECS154A Lecture: right shifter, memory arrays

A right shifter can be built from four muxes like so:

Such shifters can be used to build a read-only memory array—memory from purely combination circuits.

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Above depicts a memory array with $2^N$ elements each storing $M$ bits. If $N=10$ and $M=12$, we have $2^{10}=1024$ and we can denote this as a $1024\times 12$ (or $1024\times 12\text{-bit}$) array.

Say that we need to build a $2048\times 8$ memory from $1024\times 8$ memory arrays:

This circuit uses a tristate buffer (buffer with enable, in this case an active low enable):

$\overline{E}$	X	Y
0	0	0
0	1	1
1	0	Z
1	1	Z

As illustrated, the tristate buffer has three possible states, 0 & 1 (possible when the buffer is enabled) and Z (high impedance, used when buffer is disabled).

SOC001 Lecture: work

• Sociology is interested in how economical structures influences aspects of social life.
• mechanical solidarity: social cohesion based on similarity, i.e., people tend to bond due to feeling similar to one another
• organic solidarity: social cohesion based on interdependence, e.g., division of labor, specialization
• theoretical perspectives on economy
  • functionalist: (missed)
  • conflict theorist: How does economy reflects and reproduces inequality? How is wealth concentrated in the hands of a few, and why?
    • e.g., Karl Marx
  • symbolic-interactionist: norms & values related to economy and how they affect socialization, jobs, etc
• types of economies: agricultural (food production), industrial (goods production), post-industrial (information production)
• alternate perspective on types of economies: socialism vs capitalism