AXI is an on-chip, point to point communication protocol. It is used as a high-performance bus in various IP or SoC Systems. It is used for connecting high-performance processors with memory.
The Advanced Peripheral Bus (APB) is part of the Advanced Microcontroller Bus Architecture (AMBA) protocol family. It defines a low-cost interface that is optimized for minimal power consumption and reduced interface complexity.
AXI is an on-chip, point to point communication protocol. It is used as a high-performance bus in various IP or SoC Systems. It is used for connecting high-performance processors with memory.
The Advanced Peripheral Bus (APB) is part of the Advanced Microcontroller Bus Architecture (AMBA) protocol family. It defines a low-cost interface that is optimized for minimal power consumption and reduced interface complexity.
AMBA AHB is a bus interface suitable for high-performance synthesizable designs. It defines the interface between components, such as masters, interconnects, and slaves.
Introduction to SOC Verification Fundamentals and System Verilog language coding. Explains concepts on Functional Verification methodologies used in industry like OVM, UVM
Serial Peripheral Interface (SPI) is an interface bus commonly used to send data between microcontrollers and small peripherals such as shift registers, sensors, and SD cards.
AMBA AHB is a bus interface suitable for high-performance synthesizable designs. It defines the interface between components, such as masters, interconnects, and slaves.
Introduction to SOC Verification Fundamentals and System Verilog language coding. Explains concepts on Functional Verification methodologies used in industry like OVM, UVM
Serial Peripheral Interface (SPI) is an interface bus commonly used to send data between microcontrollers and small peripherals such as shift registers, sensors, and SD cards.
SystemVerilog Assertions verification with SVAUnit - DVCon US 2016 TutorialAmiq Consulting
SVAUnit is an UVM compliant package that addresses verification of SystemVerilog Assertions (SVAs) with several advantages:
- decouple assertion validation code from assertion definition code
- simplify the generation of a wide range of stimuli, from 1 bit signal toggling to transactions
- provide the ability to reuse scenarios
- provide self-checking mechanisms
- report test status automatically
- integrate with major simulators
This tutorial discusses SVA planning, coding guidelines, SVAUnit (SVAUnit framework, self-checking tests, debug), and test patterns. Planning includes parametrization, temporal sequence composition, sequence reuse and also consider how the SVA package will be integrated with other verification methods. Coding guidelines ensure efficiency as well as avoid common implementation pitfalls.
memcached Binary Protocol in a NutshellToru Maesaka
Presentation on the upcoming Binary Protocol in memcached 1.3
This presentation covers how we can benefit from the binary protocol and how it actually works.
Design and Implementation of AMBA ASB APB BridgeManu BN
The 32 bit AMBA ASB APB Bridge provides an interface between the Advanced System Bus (ASB) and the Advanced Peripheral Bus (APB). It inserts wait states for a burst of read or write transfers when the ASB must wait for the APB. The bridge is designed to respond to transaction requests from the currently enabled ASB master. The ASB transactions are converted into APB transactions. APB peripherals do not need a clock input as the APB access is timed with a strobe signal generated by the ASB to APB bridge interface. The AMBA ASB APB Bridge is modeled using Verilog HDL and validated on SPARTAN 3E and the results are visualized on ChipScope Pro.
The design is also published in IEEE Xplore Link:
http://ieeeexplore.info/xpl/articleDetails.jsp?tp=&arnumber=6825442&queryText%3Dmanu+b.n
Top 10 protocol interview questions with answersgracemartinez012
In this file, you can ref interview materials for protocol such as, protocol situational interview, protocol behavioral interview, protocol phone interview, protocol interview thank you letter, protocol interview tips …
The Handy Culture Deck provides an inside look at the uniquely Handy company and culture we are building to achieve our mission. It outlines the things we believe at Handy and the ways we try to live up to them.
Interested joining the team at Handy and changing the world? Visit handy.com/careers
Advance Microcontroller Bus Architecture(AMBA).
this is a advance bus architecture. it is defined by ARM.
all the content is taken from http://infocenter.arm.com/ website.
VLSI DESIGN OF AMBA BASED AHB2APB BRIDGEVLSICS Design
The Advanced Microcontroller Bus Architecture (AMBA) is an open System-on-Chip bus protocol for highperformance buses to communicate with low-power devices. In the AMBA Advanced High Performance bus (AHB) a system bus is used to connect a processor, a DSP, and high-performance memory controllers where as the AMBA Advanced Peripheral Bus (APB) is used to connect (Universal Asynchronous Receiver Transmitter) UART. It also contains a Bridge, which connects the AHB and APB buses. Bridges are standard bus-to-bus interfaces that allow IPs connected to different buses to communicate with each other in a standardized way. So AHB2APB bridge is designed, implemented using VERILOG tool and tested using Verilog testbench and is reported in this paper. A synthesizable RTL code of a complex interface
bridge between AHB and APB is developed and known as AHB2APB Bridge. The simulated AHB2APB Bridge results are promising and can be further tested for its verstality by writing a verification program using UVM in future.
VLSI DESIGN OF AMBA BASED AHB2APB BRIDGEVLSICS Design
The Advanced Microcontroller Bus Architecture (AMBA) is an open System-on-Chip bus protocol for highperformance
buses to communicate with low-power devices. In the AMBA Advanced High Performance bus (AHB) a system bus is used to connect a processor, a DSP, and high-performance memory controllers where as the AMBA Advanced Peripheral Bus (APB) is used to connect (Universal Asynchronous Receiver Transmitter) UART. It also contains a Bridge, which connects the AHB and APB buses. Bridges are standard bus-to-bus interfaces that allow IPs connected to different buses to communicate with each other in a standardized way. So AHB2APB bridge is designed, implemented using VERILOG tool and tested using Verilog testbench and is reported in this paper. A synthesizable RTL code of a complex interface
bridge between AHB and APB is developed and known as AHB2APB Bridge. The simulated AHB2APB Bridge results are promising and can be further tested for its verstality by writing a verification program using UVM in future.
VLSI DESIGN OF AMBA BASED AHB2APBBRIDGEVLSICS Design
The Advanced Microcontroller Bus Architecture (AMBA) is an open System-on-Chip bus protocol for highperformance buses to communicate with low-power devices. In the AMBA Advanced High Performance bus (AHB) a system bus is used to connect a processor, a DSP, and high-performance memory controllers where as the AMBA Advanced Peripheral Bus (APB) is used to connect (Universal Asynchronous Receiver Transmitter) UART. It also contains a Bridge, which connects the AHB and APB buses. Bridges are standard bus-to-bus interfaces that allow IPs connected to different buses to communicate with each other in a standardized way. So AHB2APB bridge is designed, implemented using VERILOG tool and tested using Verilog testbench and is reported in this paper. A synthesizable RTL code of a complex interface bridge between AHB and APB is developed and known as AHB2APB Bridge. The simulated AHB2APB Bridge results are promising and can be further tested for its verstality by writing a verification program using UVM in future.
Design and Implementation of SOC Bus Based on AMBA 4.0ijsrd.com
ARM introduced the Advanced Microcontroller Bus Architecture (AMBA) 4.0 specifications in March 2010, which includes Advanced extensible Interface (AXI) 4.0. AMBA bus protocol has become the de facto standard SoC bus. That means more and more existing IPs must be able to communicate with AMBA 4.0 bus. Based on AMBA 4.0 bus, we designed an Intellectual Property (IP) core of Advanced Peripheral Bus (APB) Bridge, which translates the AXI4.0-lite transactions into APB 4.0 transactions. The bridge provides an interface between the high-performance AXI bus and low-power APB domain.
Book Formatting: Quality Control Checks for DesignersConfidence Ago
This presentation was made to help designers who work in publishing houses or format books for printing ensure quality.
Quality control is vital to every industry. This is why every department in a company need create a method they use in ensuring quality. This, perhaps, will not only improve the quality of products and bring errors to the barest minimum, but take it to a near perfect finish.
It is beyond a moot point that a good book will somewhat be judged by its cover, but the content of the book remains king. No matter how beautiful the cover, if the quality of writing or presentation is off, that will be a reason for readers not to come back to the book or recommend it.
So, this presentation points designers to some important things that may be missed by an editor that they could eventually discover and call the attention of the editor.
Can AI do good? at 'offtheCanvas' India HCI preludeAlan Dix
Invited talk at 'offtheCanvas' IndiaHCI prelude, 29th June 2024.
https://www.alandix.com/academic/talks/offtheCanvas-IndiaHCI2024/
The world is being changed fundamentally by AI and we are constantly faced with newspaper headlines about its harmful effects. However, there is also the potential to both ameliorate theses harms and use the new abilities of AI to transform society for the good. Can you make the difference?
You could be a professional graphic designer and still make mistakes. There is always the possibility of human error. On the other hand if you’re not a designer, the chances of making some common graphic design mistakes are even higher. Because you don’t know what you don’t know. That’s where this blog comes in. To make your job easier and help you create better designs, we have put together a list of common graphic design mistakes that you need to avoid.
3. Typographical
● This specification uses the following typographical conventions:
● Italic - Highlights important notes, introduces special
terminology,denotes internal cross-references, and citations.
● Bold - Highlights interface elements, such as menu names. Denotes
ARM processor signal names. Also used for terms in descriptive lists,
where appropriate.
● Monospace - Denotes text that you can enter at the keyboard, such as
commands, file and program names, and source code.
● Monospace - Denotes a permitted abbreviation for a command or
option. You can enter the underlined text instead of the full command
or option name.
4. ●monospace italic - Denotes arguments to monospace text where the
argument is to be replaced by a specific value.
●monospace bold - denotes language keywords when used outside
example code.
●<and> - Angle brackets enclose replaceable terms for assembler syntax
where they appear in code or code fragments. They appear in normal font
in running text. For example:
● MRC p15, 0 <Rd>, <CRn>, <CRm>, <Opcode_2>
● The Opcode_2 value selects which register is accessed.
7. Signals
● The signal conventions are:
● Signal level - The level of an asserted signal depends on
whether the signal is active-HIGH or active-LOW. Asserted
means HIGH for active-HIGH signals and LOW for active-
LOW signals.
● Prefix P - Denotes AMBA 3 APB signals.
● Suffix n - Denotes AXI, AHB, and AMBA 3 APB reset
signals.
8. About the AMBA 3 APB
● The APB is part of the AMBA 3 protocol family. It provides a low
cost interface that is optimized for minimal power consumption and
reduced interface complexity.
● The APB interfaces to any peripherals that are low-bandwidth and do
not require the high performance of a pipelined bus interface. The
APB has unpipelined protocol.
● All signal transitions are only related to the rising edge of the clock to
enable the integration of APB peripherals easily into any design flow.
Every transfer takes at least two cycles.
● The APB can interface with the AMBA Advanced High-performance
Bus Lite (AHB-Lite) and AMBA Advanced Extensible Interface
(AXI). You can use it to provide access to the programmable control
registers of peripheral devices.
9. Changes for AMBA 3 APB Protocol
Specification v1.0
● This version includes:
● A ready signal, PREADY, to extend an APB
transfer.
● An error signal, PSLVERR, to indicate the failure of
a transfer.
10. Transfers
● Write transfers
● Two types of write transfer are described in this
section:
● With no wait states
● With wait states.
12. The write transfer starts with the address, write data, write signal
and select signal all changing after the rising edge of the clock.
The first clock cycle of the transfer is called the Setup phase. After
the following clock edge the enable signal is asserted, PENABLE,
and this indicates that the Access phase is taking place. The
address, data and control signals all remain valid throughout the
Access phase. The transfer completes at the end of this cycle.
The enable signal, PENABLE, is deasserted at the end of the
transfer. The select signal, PSELx, also goes LOW unless the
transfer is to be followed immediately by another
transfer to the same peripheral.
13. With wait states
● Figure shows how the PREADY signal from the slave can
extend the transfer. During an Access phase, when PENABLE is
HIGH, the transfer can be extended by driving PREADY LOW.
The following signals remain unchanged for the additional
cycles:
● address, PADDR
● write signal, PWRITE
● select signal, PSEL
● enable signal, PENABLE
● write data, PWDATA.
15. ● PREADY can take any value when PENABLE is LOW.
This ensures that peripherals that have a fixed two cycle
access can tie PREADY HIGH.
● NOTE - It is recommended that the address and write
signals are not changed immediately after a transfer but
remain stable until another access occurs. This reduces
power consumption.
16. Read transfers
● Two types of read transfer are described in this
section:
● With no wait states
● With wait states.
17. With no wait states
Figure shows a read transfer. The timing of the address, write, select,
and enable signals are as described in Write transfers on page 2-2. The
slave must provide the data before the end of the read transfer
18. With wait states
● Figure shows how the PREADY signal can extend the transfer. The
transfer is extended if PREADY is driven LOW during an Access
phase. The protocol ensures that the following remain unchanged for
the additional cycles:
● address, PADDR
● write signal, PWRITE
● select signal, PSEL
● enable signal, PENABLE.
● Figure shows that two cycles are added using the PREADY signal.
However, you can add any number of additional cycles, from zero
upwards.
19.
20. Error response
● You can use PSLVERR to indicate an error condition on an APB
transfer. Error conditions can occur on both read and write
transactions.
● PSLVERR is only considered valid during the last cycle of an
APB transfer, when PSEL, PENABLE, and PREADY are all
HIGH
● It is recommended, but not mandatory, that you drive PSLVERR
LOW when it is not being sampled. That is, when any of PSEL,
PENABLE, or PREADY are LOW.
21. Error response contd..
● Transactions that receive an error, might or might not have changed
the state of the peripheral. This is peripheral-specific and either is
acceptable. When a write transaction receives an error this does not
mean that the register within the peripheral has not been updated.
Read transactions that receive an error can return invalid data. There
is no requirement for the peripheral to drive the data bus to all 0s for a
read error.
● APB peripherals are not required to support the PSLVERR pin. This
is true for both existing and new APB peripheral designs. Where a
peripheral does not include this pin then the appropriate input to the
APB bridge is tied LOW.
22. Write transfer
● Figure shows an example of a failing write transfer that
completes with an error.
23. Read transfer
● A read transfer can also complete with an error response, indicating
that there is no valid read data available. Figure 2-6 on page 2-7
shows a read transfer completing with an error response.
24. Mapping of PSLVERR
● When bridging:
● From AXI to APB An APB error is mapped back to
RRESP/BRESP = SLVERR. This is achieved by mapping
PSLVERR to the AXI signals RRESP[1] for reads and
BRESP[1] for writes.
● From AHB to APB PSLVERR is mapped back to HRESP =
ERROR for both reads and writes. This is ac
26. The state machine operates through the following
states:
● IDLE - This is the default state of the APB.
● SETUP - When a transfer is required the bus moves
into the SETUP state, where the appropriate select
signal, PSELx, is asserted. The bus only remains in
the SETUP state for one clock cycle and always
moves to the ACCESS state on the next rising edge
of the clock.
27. Contd....
● ACCESS - The enable signal, PENABLE, is asserted in the
ACCESS state. The address, write, select, and write data
signals must remain stable during the transition from the
SETUP to ACCESS state. Exit from the ACCESS state is
controlled by the PREADY signal from the slave:
1 - If PREADY is held LOW by the slave then the peripheral bus remains in
the ACCESS state.
2 - If PREADY is driven HIGH by the slave then the ACCESS state is exited
and the bus returns to the IDLE state if no more transfers are required.
Alternatively, the bus moves directly to the SETUP state if another transfer
follows.