Skip to main content

Questions tagged [addressing]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
54 views

How to do a high input count similar to addressable LEDs

I'm trying to find an IC or something similar with a high input count that can compare sensors in a simple matrix and trigger an output. Matrix would be: ...
Fordo's user avatar
  • 1
0 votes
1 answer
125 views

Short address DALI-2

I'm trying to write a complete algorithm for assigning short addresses to input devices on a DALI bus. At the start I don't know how many input devices are installed on a DALI bus. The procedure in ...
Nicola Bellini's user avatar
0 votes
0 answers
34 views

Connecting higher density LPDDR3 SDRAM than the ATSAMA5D27C processor supports

I'm designing a Single Board Computer for the first time. The board will have ATSAMA5D27C as its MPU with LPDDR3 SDRAM. The datasheet specifies that the maximum SDRAM it can support is of 4Gb (512 ...
Prabhat Narang's user avatar
1 vote
0 answers
174 views

Understanding the 20-Bit Addressing in 8086 Memory Architecture: Why Not 18 Bits for Base and 16 Bits for Offset?

I'm curious about the memory addressing in the 8086 microprocessor. Given that there are four segments and 16 bits for the offset address, the total address space is 20 bits. I'm wondering why there's ...
Emad Kheyroddin's user avatar
9 votes
2 answers
616 views

What is the theoretical maximum capacity of 72-pin RAM modules?

I'm asking, because the information on Wikipedia is extremely lackluster, perhaps even incorrect. This is my current understanding: A 72-pin module has 12 address pins, 4 CAS, and 4 RAS pins. (For ...
polemon's user avatar
  • 1,097
0 votes
0 answers
19 views

Rising Edge Demux

I'm trying to create a demux for the YM2610 sound chip. The sound chip selects whether to set the low bits or high bits of the address with a single pulse; the rising edge should trigger a latch for ...
S T's user avatar
  • 1
3 votes
1 answer
82 views

Memory Capacity and Memory Addresses

According to this site, in Table2, HBM(HBM2e) has a capacity of 8Gb = 2^33 bits per channel. Here, it has a 24-bit address consisting of 4 bits from the Bank address BA[3:0], 15 bits from the Row ...
cashew_nuts's user avatar
3 votes
1 answer
286 views

Do there exist I2C address-remapping "NAT" chips?

For I2C devices that do not support address changes, do there exist "I2C address proxies" that can sit in front of the statically-addressed device and proxy a different address to the chip ...
KJ7LNW's user avatar
  • 2,128
2 votes
0 answers
71 views

Does I3C addressing assign stable addresses based on physical displacement?

I'm potentially looking at making a modular keyboard, where I have a single unit for each key (a la these atoms someone else used for experimenting), and I became curious about what would happen with ...
Clockwork-Muse's user avatar
0 votes
1 answer
146 views

What's the *actual* meaning behind the I²C reserved addresses?

I'm building a i2c-tiny-usb compatible adapter, and am trying to implement a "transparent side channel" for advanced configuration/features of the adapter....
nonchip's user avatar
  • 207
4 votes
1 answer
1k views

Where do 1-wire device (such as DS18B20) manufacturers obtain their addresses?

We know that 1-wire devices, such as the DS18B20 temperature, sensor have 1 64 bit address, of which 8 bits is 0x28 and another 8 bits is the CRC. We know that the address is burned into the chip at ...
KDM's user avatar
  • 173
0 votes
2 answers
129 views

I2C Addresses - How to check

I want to use these two devices - 24AA512 and MCP79410M. The EEPROM part has external A0, A1 & A2 for address. But the other part does not have external address pins. In this case, how to ...
Freshman's user avatar
0 votes
1 answer
90 views

How to debug modbus rtu address space problems? [closed]

I have an "Ewon Flexy server" and an "IMO SD1 Inverter" connected via Modbus RTU RS485. I can change some of the parameters with Flexy interface and observe the change in the ...
Juha's user avatar
  • 188
1 vote
1 answer
465 views

How can I recreate a circuit like the WS2812 addressable RGB LEDs without the actual strip?

I've tried googling, youtube, even chatgpt but I'm not quite finding what I need. Can you point me in the right direction for how to create a custom circuit similar to an addressable RGB LED, where I ...
tsdexter's user avatar
  • 147
0 votes
0 answers
223 views

Addressable RGB lights on a battery

I'm working on a DIY project making an RGB tube light or wand. My concern is how I can run an addressable RGB strip on batteries. Things I have; A one metre strip with 144 pixels on it that needs 5V ...
Shaikh Shajaa's user avatar
1 vote
4 answers
2k views

Reading from a slave on the I2C bus: Why is the slave address provided twice?

I am new to I2C and learning more about it from this TI document. In the above image you can see that the slave address is provided twice. Why is that?
Confused's user avatar
  • 2,593
3 votes
1 answer
220 views

Connecting I2C sensors with the same address over 16-20 metres in a daisy-chain with 1 cable

I'm trying to solve the following problem: "How to connect 3 to 8 I2C sensors with the same address over 16-20 metres in a daisy-chain with 1 cable without having to deal with address clashes or ...
Noideas's user avatar
  • 109
0 votes
0 answers
324 views

Computer architecture: Count of RAM, ROM and I/O interface addressing

I am trying to work through this question and I appreciate any help or hint. Thank you Problem: A computer system uses RAM chips of size 512x8 and ROM chips of size 256x8. The computer system needs 4k ...
Node.JS's user avatar
  • 101
2 votes
1 answer
986 views

How do you fit so many instructions on a 8-bit processor?

I will preface this that it is highly likely that I have misunderstood how Harvard architecture works, but I cannot understand how an 8-bit instruction set, say the ATmega128 for example, can contain ...
Lyndon Alcock's user avatar
7 votes
3 answers
3k views

How are BAR registers handled between end points in PCI Express?

I have a question related to the PCI Express protocol. I managed to understand most of the features of the PCI Express protocol but could not entirely understand the enumeration process. I know the ...
Joseph Star's user avatar
4 votes
0 answers
118 views

Can I use LPDDR3 memory that is larger than my processor supports?

I am working on a thing that uses a STM32MP157C. Its datasheet says: The STM32MP157C/F devices embed a controller for external SDRAM which support the following devices • LPDDR2 or LPDDR3, 16- or 32-...
Emily's user avatar
  • 141
0 votes
1 answer
37 views

what's thsi register Address: "16’b11_0_1_0nnn_0001_0011" stands for?

I'm learning a "PHY full rate clock divider configuration register" and it represents its register Address as 16’b11_0_1_0nnn_0001_0011 I think 16 stands for bit number, ...
Chen Li's user avatar
  • 125
0 votes
1 answer
433 views

KSZ8081 PHY address configuration

I'm using this KSZ8081 PHY transceiver. I'm unable to understand how to configure the PHYAD[0:2] pin and the B-CAST_OFF pin. As far as I read, the PHY Broadcast address will always be "0" ...
user avatar
0 votes
1 answer
68 views

Alternate of the parallel flash

Hi I am looking for an alternate of the flash S29AL016J70BFI010, its a top boot sector device. unfortunately I have not found any 16Mb flash with top boot sectors. Although I am able to find 32Mb or ...
Manoj N's user avatar
1 vote
2 answers
2k views

PCIe End-Point configuration for communication with Root Complex

I have an ambiguity regarding the PCIe initial configuration which is performed by the root complex (RC) on the end-points (EP). Both devices have their own base address registers (BARs). The RC ...
malik12's user avatar
  • 135
0 votes
1 answer
389 views

How is a read of SDRAM done?

A SDRAM module is divided into chips. And those chips into banks. Banks can have different row and column lengths. When reading a given address, I feed the address to the memory specifying the address ...
Franks's user avatar
  • 33
0 votes
0 answers
107 views

What is the difference between Content Memory Addressing (CMA) and Content Addressable Memory (CAM)?

I have been looking over the internet for Content Memory Addressing(CMA) but whenever I search for it I get Content Addressable Memory (CAM). So I am confused, is CMA and CAM the same thing. If ...
Shashi Kumar's user avatar
0 votes
1 answer
153 views

What is the difference between Register Addressing mode and Direct Addressing mode(8051)?

I find that there is no difference between the Register Addressing mode and the Direct Addressing mode. Can anyone tell the difference with respect to the 8051 microcontroller ?
Circuit_Breaker0.7's user avatar
0 votes
0 answers
521 views

Offset of bnez in RISC-V program

I came across a question about assembly that I was confused on. We are given the following table for addresses and instructions: The question says: replace the labels of PC-relative targets with ...
Manny's user avatar
  • 9
1 vote
1 answer
2k views

Addressing scheme with CAN bus

I'm going through some addressing schemes with CAN bus. I came across this post: Most efficient way to handle addressing / termination in a daisy-chained CAN bus? There's a solution explained called ...
Ander Cash's user avatar
1 vote
2 answers
353 views

what is modulo addressing?

What exactly is modulo addressing? I think here is a useful source but I can't understand what it is exactly about. From my understanding it implements a circular buffer. Is it that? Why is that so ...
Ben's user avatar
  • 625
0 votes
1 answer
257 views

Specifying the address range of each memory block

Four 16x4bit blocks are interconnected to form a 64-bit memory as shown below First of all why is a block here called 16x4bit ; 4 bits are related to the input gates but what's with 16 here ? I also ...
Samir's user avatar
  • 227
2 votes
1 answer
1k views

Dali commissioning Luminaires

I have more than one lamp and i need to make a program to commissioning. I've already did it whit a single lamp but now I don't know : How to make addresses for multiple lamps (in my case A3 is ...
Les Go's user avatar
  • 155
2 votes
2 answers
9k views

modbus register address vs. register number; absolute address vs. offset

I'm developing a Modbus Server device, and I'm having a little trouble understanding how to name or address my registers. Let's say I have 2 Discrete Inputs and 2 Input registers. From Modicon ...
il_mix's user avatar
  • 167
0 votes
1 answer
67 views

Address decoder design and memory tables (recommended books)

i have been self studying and i encountered with an exercise of address decoder design, i have seen videos and i have searched in this book "Digital design by M. Morris" which is the one im using for ...
xXesenciaXx's user avatar
0 votes
1 answer
162 views

Dynamically setting address of HT12E with Raspberry Pi

I have a project where I need to send a wireless signal to one of several receivers to turn on an LED. One transmitter, several (many) receivers, each with an LED. The receivers need to have low ...
Hjalte's user avatar
  • 101
1 vote
1 answer
338 views

How to read this memory map of LPC1769 microcontroller?

I'm trying to understand the memory map of the LPC1769 microcontroller using the official NXP datasheet. The screenshot below shows at 0x00004000 to 0x00008000 there is 512kB of flash memory mapped, ...
micromicrocontroller's user avatar
0 votes
1 answer
193 views

Can a memory chip have a certain starting address

In my book there is a question stated: Can a memory chip of capacity 512 KB have the starting address 2B0000h? To me this seems like an incomplete question with a wrong answer in the book. The ...
user1949350's user avatar
0 votes
2 answers
1k views

Memory-mapped IO vs Port-mapped IO in microcontrollers

I've been reading about external peripheral mapping to microcontrollers. I understand that memory-mapped IO means that the same address space in the microcontroller can be used for internal memory ...
Engineer999's user avatar
1 vote
4 answers
2k views

8/16/32 Bits of microcontrollers [duplicate]

I am new to the field of embedded systems. Recently I was learning about the differences between different bit size (8, 16, 32) microcontrollers. What I found was that the size of bit indicates the ...
Bhuvnesh's user avatar
  • 612
0 votes
1 answer
146 views

Multiplexer to switch between many sets of 8 channels [closed]

I have many (up to 16) 8-channel "buses" (not digital, but analog) each with signals which I want to read with a single 8-channel analog-to-digital converter (ADC). I would switch between these ~16 ...
Sean's user avatar
  • 490
4 votes
1 answer
712 views

Microprocessor architecture bits vs bus sizes

I am ready following on this website: "Another big difference between 32-bit processors and 64-bit processors is the maximum amount of memory (RAM) that is supported. 32-bit computers support a ...
alt-rose's user avatar
  • 1,479
0 votes
1 answer
292 views

Address decoding different bank sizes in 64K memory

I'm doing a small Motorola 6809-based computer project, and since I'm a bit rusty when it comes to boolean algebra I'm wondering if I'm doing my address decoding a bit too complicated for my simple ...
tobier's user avatar
  • 197
0 votes
2 answers
82 views

Addressing 45 Inputs Down to 6 pin Output

I'm looking for a chip which could minimize ~45 button inputs down to an 6 pin input for use with Raspberry Pi. I know this is a simple problem and it has likely been solved before, but as an ...
DHLaurelT's user avatar
1 vote
1 answer
135 views

How many external devices can be linked to a CPU with n address buses and m data buses?

(Hypothetical) Let's say there is a CPU with 8 address lines and 8 data lines. If each external device has 128 accessible registers, how many external devices can be linked? For 8 address lines, I ...
Jordan_b's user avatar
0 votes
1 answer
272 views

Finding address space

Could somebody please explain how to find the address space for the RAM, Sensors, Alarm and ROM? :) The answer is supposed to be ROM: 0000-1FFF RAM: 2000-3FFF Sensors: FFF0 - FFFF Alarm: FFFE
Hege's user avatar
  • 3
1 vote
2 answers
808 views

Does pin A15 on a Z80 tell if the CPU is addressing ROM or RAM?

I am designing a simple, hobbyist single board computer similar to an Arduino using a Z80 CPU. The trouble I am running into is how the CPU addresses memory. I know that the Z80 uses pins A0-A15 to ...
Shades's user avatar
  • 113
5 votes
4 answers
4k views

advantages of PC-relative addressing

I have read somewhere: "The advantage of using relative mode over direct mode is that relative addressing is a code which is position-independent, i.e. it can be loaded anywhere in memory without ...
jack.math's user avatar
1 vote
2 answers
70 views

Address bus, databus: how much storage direct accessible

I have a CPU with a 32 bits data bus and a 21 bits address bus. I would like to know how much storage I can connect to this CPU directly. Does this depend on the address bus width, because I can ...
Hemmelig's user avatar
  • 115
8 votes
3 answers
2k views

Why are the SRAM data and address pins numbered? [duplicate]

As far as understand, it would make no difference to the operation of an SRAM if you mixed up the order of the address or data pins. E.g. http://www.farnell.com/datasheets/1911297.pdf?_ga=2.220805788....
fadedbee's user avatar
  • 982