Every digital chip on Earth is a stack of three layers: a logic family at the bottom (which transistors are wired which way), a memory technology in the middle (where bits live), and a description language at the top (how humans tell silicon what to do). This chapter is the bridge between abstract logic and physical silicon.
In Chapter 1 we built the CMOS transistor. In Chapter 4 we built gates and flip-flops as black-box symbols. In Chapter 6 we touched the analog/digital boundary and met the 555. Now we descend one more level. We will look at the families a real chip is built in (TTL, ECL, CMOS, the modern low-voltage variants), the memory cells that hold every bit in your laptop, the programmable fabric (PALs, CPLDs, FPGAs) that lets a single chip pretend to be any digital system, and the hardware description languages (Verilog, VHDL) that engineers actually use today instead of drawing schematics. Along the way we will pick up the security implications: cold-boot attacks, Rowhammer, FPGA bitstream cloning, JTAG dumps, SRAM PUFs.
This chapter is long because the territory is wide. Take it in pieces. Read the family section, then put it down for a day. Read the memory section. Then come back for FPGAs and HDL. Each section stands alone but ties to the others.