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Rom

lorenzonotaro·lncpu·v1/kicad/rom/rom.kicad_pcb

Rom PCB layout, top view — open source board by lorenzonotaro
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About the Rom PCB

Rom is an open source PCB design by lorenzonotaro, published on GitHub. It is a 2-layer board measuring 65.5 × 77 mm, with 7 components from 6 distinct parts.

Other key parts include the AT28C64B-15PU, LNCPU Type A Header and 74HCT541. By type, the board carries 4 capacitors and 3 ICs.

From the project

v1 is the current implementation of the lncpu.

v1 is the current implementation of the lncpu.

The clock cycle is divided in two phases: Φ1 (control phase) and Φ2 (data phase).

During Φ1, the data bus contains the contents of [CS:PC]: only the device mapped to the memory section containing address CS:PC` is allowed to write to the data bus, regardless of control signals.

* During Φ2, bus control is determined by the control signals of the current microinstruction.

Rom, from the project README
From the project README

Main components on the Rom

AT28C64B-15PULNCPU Type A Header74HCT541

Rom bill of materials (BOM)

7 components, 6 distinct parts.

QtyPartRefs
1
AT28C64B-15PU
IC1
1
LNCPU Type A Header
U1
1
74HCT541
U2
2
220n
C1, C2
1
47u
C3
1
1u
C4

Rom design files

The KiCad project lives in the lorenzonotaro/lncpu repository on GitHub; these links point at the commit this page was built from.

Rom: common questions

How big is the Rom PCB?

The Rom measures 65.5 × 77 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Rom?

7 components, from 6 distinct parts. The full bill of materials is listed on this page.

Where can I download the Rom design files?

From the lorenzonotaro/lncpu repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Rom design in my own project?

The repository has no license, so all rights stay with lorenzonotaro. Use it as a reference, and ask the author before reusing the design.

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