On April 15 of 2024 Zilog has launched End-of-Life for Z80, no doubt one of doubtlessly the most famed 8-bit CPUs of all time.
It’s a time for birth-source and hardware preservation community to step in with a Free and Initiate Source Silicon (FOSS) replacement for Zilog Z80.
The first fabrication of FOSS Z80 is scheduled for June of 2024!
On the route to become a silicon confirmed, pin like minded, birth-source replacement for frequent Zilog Z80.
FOSS Z80 leverages OpenROAD circulate and FOSS 130 nm Skywater PDK to synthesize manufacturing ready silicon. Minute Tapeout infrastructure is ragged to test and pool make with many others to decrease the price of physical chip fabrication at Skywater Foundries.
The considerable iteration is developed with Minute Tapeout 07 the use of 130 nm assignment and fits on a 0.064 mm2 die field. The considerable fabrication is scheduled for June of 2024 as a component of CI 2406 Shuttle.
The implementation is primarily primarily based around Man Hutchison’s TV80 Verilog core.
Study documentation for Minute Tapeout 07 model
Under is the image of GDSII constructed-in circuit format for FOSS Z80. It’s the tip outcomes of computerized affirm-and-route circulate in OpenROAD the use of 130 nm “gates” logic substances.
- Add thorough instruction (including ‘illegal’) execution exams ZEXALL to testbench
- Examine diversified implementations: Verilog core A-Z80, Netlist primarily primarily based Z80Explorer
- Tapeout with ChipIgnite in QFN44 package deal
- Tapeout with DIP40 package deal
- Develop gate-level layouts that can maybe per chance resemble the distinctive Z80 format, peer the distinctive chip dies under. Zilog designed Z80 by manually placing each and each transistor by hand.
Oral Historical past Panel on the Founding of the Company and the Model of the Z80 Microprocessor
M. Shima on Demystifying Microprocessor Form
- (expired) Patent US4605980 — enter voltage spike security
- (expired) Patent US4332008A — ???
- (expired) Patent US4486827A — reset circuitry
- Study the intention to “be taught” die photos
- nMOS variant Z8400 with ‘Zilog 75’ marking and Zilog Z8400 with ‘DC’ letter marking
- CMOS variants Zilog Z84C00 and its 8MHz model
- Nintendo Z80 variant from Huge Sport Boy SGB-CPU 01 produced in 1994
- Sean Riddle’s image of Mostek MK3880 clone steel layer eliminated
- Pauli Rautakorpi’s pictures of Z80 clones: National Semiconductor NSC800, Mostek MK3880, MME9201 with ‘U880/5’ markings
- Zeptobar’s pictures of Zilog Z0840004PSC from 1990, Soviet KR1858VM3 with an uncommon format, MME Z80A a clone on a 5um abilities elevated than the distinctive Zilog chip, Soviet KR1858VM1 a clone of U880/6 which is in flip a clone of Z80, Soviet T34VM1 in preserving with U880/5
- Z80 Instruction Register deciphered
- Z80 Tri-acknowledged Info & Contend with bus gates
- Z80 (un)documented behavior
- The instruction decode PLA in the Z80 microprocessor
- Why the Z-80’s files pins are scrambled
- How the Z80’s registers are implemented
- The Z-80’s 16-bit increment/decrement circuit reverse engineered
- The Z-80 has a 4-bit ALU
- XOR, the silicon for two attention-grabbing gates defined
- WZ aka MEMPTR, esoteric register of the Z80
- TV80 in Verilog https://github.com/hutch31/television80
- TV80 in Verilog https://github.com/Obijuan/Z80-FPGA
- A-Z80 in Verilog https://github.com/gdevic/A-Z80 its overview and particulars
- Z80 gain-record level emulator https://github.com/gdevic/Z80Explorer and its overview and Customers Info
Minute Tapeout is an tutorial project that objectives to designate it less difficult and more cost effective than ever to score your digital designs manufactured on a true chip.
To be taught extra and score started, seek the advice of with https://tinytapeout.com.
