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How to connect other pins?
@copilot How to connect other pins?
2y
Based on the provided schematic connections, I can see that both memory and data address pins of the components are already connected, as well as power and ground. If you're looking to use more functionalities from your components, here are some suggestions:
ESP32-DEVKIT-V1 (U2)
You can consider using the IO pins (D2, D4, D5, D15, D18, D19, D21, D22, D23, D25, D26, D27, D32, D33, D34, D35, RX2, TX2) for peripherals and there are possibilities for implementing communication protocols like SPI, I2C, or UART if needed[1].
However, note that you need to take care to avoid the strapping pins (EN, VP, and VN) at power-on because these pins are used to determine the boot mode of the module. These pins must be at certain logic levels upon startup.
Also, remember that some pins are dedicated to flash/PSRAM communication and should not be used for other purposes.
Z80 CPU (U1)
For the Z80, there are some control signals that might be useful depending on your application:
RESET: You'd attach a digital signal that, when brought low, resets the Z80's internal registers and ceases all operations,WAIT: You can use this pin to insert wait states into the Z80's memory access cycles,INTandNMI: You can use these pins to attach interrupt-triggering signals,BUSRQ/BUSACK: You can use these for processes that require direct access to the data or address buses of the CPU (DMA operations for instance).
AT28C64B-15PU (U3)
For the EEPROM you might want to consider connecting the pin WE to activate the write enable[2].
Some of your ESP32 DEVKIT V1 are still disconnected. However, before proceeding to the connection of the extra pins, you need to clarify the functionality you want to add to your design, as the pins should be connected according to the desired functionality.
[1] Page 17
[2] Page 2
2y
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U2
U1
Reviews
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
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- A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibraryjharwinbarrozo1.5M
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- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
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networkjarwy
copilot
~RESET~(the reset pin) to ESP32'sD4. This will allow you to reset the CPU using the ESP32.~INT~(Interrupt Request) and~NMI~(Non-Maskable Interrupt) to ESP32'sD5andD18respectively. You can drive these pins high to interrupt the Z80.~WAIT~signal to ESP32'sD19which can be used to pause Z80 operation when necessary.~RD~(Read),~WR~(Write),~MREQ~(Memory Request), and~IORQ~(I/O Request) should be controlled by ESP32 too. Connect them to ESP32'sD21,RX0,TX0andD22respectively.~BUSRQ~and~BUSACK~signals could be connected toD23andENof ESP32 to control direct Bus Request and acknowledge mechanisms.~CE(Chip Enable) toVPon the ESP32. This will allow you to enable or disable the EEPROM using the ESP32.~OE(Output Enable) toVNon ESP32 for controlling output enable-application of data from memory to the data bus.~WE(Write Enable) can be connected toD34of ESP32 to control data write operations to the EEPROM.networkjarwy
copilot
~CLK~pin of the Z80 (U1) to theD13pin of the ESP32 (U2), which is good for generating the clock signal.A0throughA12) and data lines (D0throughD7) are properly connected between U1 and U3.-
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Other signals like
For EEPROM (U3):~RESET~: This may need to be driven high or low to reset the Z80 depending on your application need. You can connect a push button to it that, when pressed, ties the pin to GND. A pull up resistor to VCC should be added.~INT~and~NMI~: If you don't intend to use interrupt requests, both these pins should be tied high (to VCC) because they are active low signals.~WAIT~: If the Z80 doesn't need to be paused, this pin can also be tied high (to VCC).~BUSRQ~,~BUSACK~: If these signals are not used for external bus requests, they can be left unconnected, but again check the specific datasheet for actual instruction.~RD~,~WR~,~MREQ~,~IORQ~are essential signals for operation. These would normally connect to distinct memory or IO devices apart from the EEPROM. If there's no other devices, it should be okay to leave them unconnected.~CE: The Chip Enable pin can be tied to GND because it's an active low pin. Tying it to GND permanently enables the chip.~OE: Output Enable pin can be connected to the~RD~signal at the Z80. This would mean data is put on the data bus by EEPROM when a read signal is activated by Z80 CPU.~WE: Write Enable pin should be tied high if you're not planning to write into the EEPROM from Z80. If you aim to write into it at a later stage, consider connecting it to the~WR~signal from Z80 CPU.networkjarwy
copilot
~MREQ~(Memory Request) line is an active low control signal output by the Z80 (U1) to indicate when it's trying to perform a read or write operation with memory (as opposed to an I/O device).~MREQ~in combination with~RD~or~WR~to orchestrate read or write operations.~MREQ~line from the Z80 (U1) to the~CE(Chip Enable) line of the EEPROM (U3). This coupling can help manage the enabling of the chip. When~MREQ~is active (low), it indicates that a memory-related operation is being requested, so the EEPROM can be enabled (making~CEline low).~MREQ~on the Z80 (U1) to~CEon the EEPROM (U3)