The document discusses Advanced Microcontroller Bus Architecture (AMBA) specifications including the Advanced Peripheral Bus (APB) and AMBA High-performance Bus (AHB). It provides an overview of the APB, which is suitable for many low-speed peripherals. Key APB signals and the APB state machine are described. Examples of APB read and write transfers are shown, including those with wait states. The document also discusses the AHB, which supports higher performance features like pipelined operations, burst transfers, and multiple bus masters. Key AHB signals and examples of different transfer types are illustrated with timing diagrams.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
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Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
1. 1
EECS 373
Design of Microprocessor-Based Systems
Prabal Dutta
University of Michigan
AMBA: Advanced Microcontroller Bus Architecture
AHB: AMBA High-performance Bus
APB: Advanced Peripheral Bus
Slides developed in part by
Mark Brehob & Prabal Dutta
2. Busses: the glue that connects the pieces
2
Timers
Central
Processing
Unit
Software
Hardware
Internal
External
System Buses
AHB/APB
ldr (read)
str (write)
ISA
EECS 370
USART DAC/ADC
Internal &
External
Memory
GPIO/INT
C
Assembly
Machine Code
Interrupts
bl (int)
3. Today…
MMIO: Memory-Mapped I/O review
AMBA: Advanced Microcontroller Bus Architecture
APB: Advanced Peripheral Bus
AHB: AMBA High-performance Bus
3
4. Memory-Mapped I/O (MMIO)
• I/O model in which the same address bus/space is used to
• Do memory accesses (e.g. to RAM)
• Do I/O operations (e.g. to I/O pins or peripheral registers)
• Reading and writing memory addresses allows us to
• Read peripheral state (e.g. value of an I/O pin or FSM’s DFF)
• Issue peripheral commands (e.g. set an I/O pin or FSM’s state)
• How?
• Memory has an address and value
• Can equate a pointer to desired address
• Can set/get de-referenced value to change memory
• Can control peripheral state in this way
4
5. Reading register bits with MMIO
• How?
• Let’s say that red, green, and blue pushbuttons are mapped to memory address
0xB0000003 at bits 0, 1, and 2, respectively
• When pushed, we will read a ‘1’ from the corresponding bit
• When released, we will read a ‘0’ from the corresponding bit
Address Bit 31 24 23 16 15 8 7 210
0xB0000003 -------- -------- -------- -----
• Must mask (and perhaps shift) to select target bits for reading
5
#define PBS_REG 0xB0000003
int isBlueButtonPressed() {
return (*((uint32_t *)PBS_REG) & 0x00000004) >> 2;
}
6. Writing register bits with MMIO
• How?
• Let’s say that red, green, and blue LEDs are mapped to memory address 0xB0000004
at bits 0, 1, and 2, respectively
• Writing a ‘1’ (‘0’) to the corresponding bit turns on (off) the LED
Address Bit 31 24 23 16 15 8 7 210
0xB0000004 -------- -------- -------- -----
• When updating (set/clear) bits, must preserve remaining contents
• Use bitmask to select target bits for manipulation, e.g.
6
#define LED_REG 0xB0000004
void setRedLed() {
*((uint32_t *)LED_REG) |= 0x1;
}
void setGreenLed() {
*((uint32_t *)LED_REG) |= 0x2;
}
#define LED_REG 0xB0000004
void clearRedLed() {
*((uint32_t *)LED_REG) &= ~(0x00000001);
}
void clearBlueLed() {
*((uint32_t *)LED_REG) &= ~(0x00000004);
}
7. Some useful C keywords
• const
• Makes variable value or pointer parameter unmodifiable
• const foo = 32;
• register
• Tells compiler to locate variables in a CPU register if possible
• register int x;
• static
• Preserve variable value after its scope ends
• Does not go on the stack
• static int x;
• volatile
• Opposite of const
• Can be changed in the background
• volatile int I;
7
8. Today…
MMIO: Memory-Mapped I/O review
AMBA: Advanced Microcontroller Bus Architecture
APB: Advanced Peripheral Bus
AHB: AMBA High-performance Bus
8
9. Advanced Microcontroller Bus Architecture
(AMBA)
- Advanced/AMBA High-performance Bus (AHB)
- Advanced Peripheral Bus (APB)
AHB
• High performance
• Pipelined operation
• Burst transfers
• Multiple bus masters
• Split transactions
APB
• Low power
• Latched address/control
• Simple interface
• Suitable of many peripherals
9
14. APB bus state machine
• IDLE
• Default APB state
• SETUP
• When transfer required
• PSELx is asserted
• Only one cycle
• ACCESS
• PENABLE is asserted
• Addr, write, select, and write data
remain stable
• Stay if PREADY = L
• Goto IDLE if PREADY = H and no
more data
• Goto SETUP is PREADY = H and
more data pending
14
Setup phase begins
with this rising edge
Setup
Phase
Access
Phase
15. APB signal definitions
• PCLK: the bus clock source (rising-edge triggered)
• PRESETn: the bus (and typically system) reset signal (active low)
• PADDR: the APB address bus (can be up to 32-bits wide)
• PSELx: the select line for each slave device
• PENABLE: indicates the 2nd and subsequent cycles of an APB xfer
• PWRITE: indicates transfer direction (Write=H, Read=L)
• PWDATA: the write data bus (can be up to 32-bits wide)
• PREADY: used to extend a transfer
• PRDATA: the read data bus (can be up to 32-bits wide)
• PSLVERR: indicates a transfer error (OKAY=L, ERROR=H)
15
16. APB bus signals in action
• PCLK
• Clock
• PADDR
• Address on bus
• PWRITE
• 1=Write, 0=Read
• PWDATA
• Data written to the I/O device.
Supplied by the bus
master/processor.
16
17. APB bus signals
• PSEL
• Asserted if the current bus
transaction is targeted to this
device
• PENABLE
• High during entire transaction
other than the first cycle.
• PREADY
• Driven by target. Similar to our
#ACK. Indicates if the target is
ready to do transaction.
Each target has it’s own
PREADY
17
18. A write transfer with no wait states
18
Setup phase begins
with this rising edge
Setup
Phase
Access
Phase
19. A write transfer with wait states
19
Setup phase begins
with this rising edge
Setup
Phase
Access
Phase
Wait
State
Wait
State
20. A read transfer with no wait states
20
Setup phase begins
with this rising edge
Setup
Phase
Access
Phase
21. A read transfer with wait states
21
Setup phase begins
with this rising edge
Setup
Phase
Access
Phase
Wait
State
Wait
State
22. Example setup
•We will assume we have one bus master “CPU”
and two slave devices (D1 and D2)
• D1 is mapped to 0x00001000-0x0000100F
• D2 is mapped to 0x00001010-0x0000101F
23. CPU stores to location 0x00001004 with no
stalls
23
D1
D2
25. Design a device which writes to a register
whenever
any address in its range is written
25
32-bit Reg
D[31:0]
Q[31:0]
EN
C
We are assuming APB only gets lowest 8 bits of address here…
What if we want to have the LSB of this register control an
LED?
PREADY
PWDATA[31:0]
PWRITE
PENABLE
PSEL
PADDR[7:0]
PCLK
LED
26. Reg A should be written at address 0x00001000
Reg B should be written at address 0x00001004
26
32-bit Reg A
D[31:0]
Q[31:0]
EN
C
We are assuming APB only gets lowest 8 bits of address here…
32-bit Reg B
D[31:0]
Q[31:0]
EN
C
PREADY
PWDATA[31:0]
PWRITE
PENABLE
PSEL
PADDR[7:0]
PCLK
27. Reads…
27
The key thing here is that each slave device has its own read data (PRDATA) bus!
Recall that “R” is from the initiator’s viewpoint—the device drives data when read.
28. Let’s say we want a device that provides data from
a switch on a read to any address it is assigned.
(so returns a 0 or 1)
28
Mr.
Switch
PWRITE
PENABLE
PSEL
PADDR[7:0]
PCLK
PREADY
PRDATA[32:0]
29. Device provides data from switch A if address
0x00001000 is read from. B if address 0x00001004
is read from
29
Mr.
Switch
Mrs.
Switch
PWRITE
PENABLE
PSEL
PADDR[7:0]
PCLK
PREADY
PRDATA[31:0]
30. All reads read from register, all writes write…
30
PWDATA[31:0]
PWRITE
PENABLE
PSEL
PADDR[7:0]
PCLK
PREADY
32-bit Reg
D[31:0]
Q[31:0]
EN
C
We are assuming APB only gets lowest 8 bits of address here…
PREADY
PRDATA[31:0]
31. Things left out…
• There is another signal, PSLVERR (APB Slave Error) which we can drive
high if things go bad.
• We’ll just tie that to 0.
• PRESETn
• Active low system reset signal
• (needed for stateful peripherals)
• Note that we are assuming that our device need not stall.
• We could stall if needed.
• I can’t find a limit on how long, but I suspect at some point the processor would
generate an error.
31
32. Verilog!
32
/*** APB3 BUS INTERFACE ***/
input PCLK, // clock
input PRESERN, // system reset
input PSEL, // peripheral select
input PENABLE, // distinguishes access phase
output wire PREADY, // peripheral ready signal
output wire PSLVERR, // error signal
input PWRITE, // distinguishes read and write cycles
input [31:0] PADDR, // I/O address
input wire [31:0] PWDATA, // data from processor to I/O device (32 bits)
output reg [31:0] PRDATA, // data to processor from I/O device (32-bits)
/*** I/O PORTS DECLARATION ***/
output reg LEDOUT, // port to LED
input SW // port to switch
);
assign PSLVERR = 0;
assign PREADY = 1;
33. Actel/Microsemi implementation of
CoreAPB3
33
• ARM APB spec is silent about sharing signals
– PSEL, PREADY, PRDATA are shared
– Hence, every peripheral needs its own
decode logic…which is cumbersome
• Actel CoreAPB3 (and other) module(s) help
• Allocates per-slave signals
– PSEL, PREADY, PRDATA, PSLVERR broken out
– CoreAPB3 supports 16 slaves
– Performs address decoding for PSEL
– De-multiplexes PSEL signal
– Multiplexes PREADY, PRDATA, PSLVERR
34. Today…
MMIO: Memory-Mapped I/O review
AMBA: Advanced Microcontroller Bus Architecture
APB: Advanced Peripheral Bus
AHB: AMBA High-performance Bus
34
35. AHB-Lite supports single bus master
and provides high-bandwidth operation
• Burst transfers
• Single clock-edge operation
• Non-tri-state implementation
• Configurable bus width
35
36. AHB-Lite bus master/slave interface
• Global signals
• HCLK
• HRESETn
• Master out/slave in
• HADDR (address)
• HWDATA (write data)
• Control
• HWRITE
• HSIZE
• HBURST
• HPROT
• HTRANS
• HMASTLOCK
• Slave out/master in
• HRDATA (read data)
• HREADY
• HRESP
36
37. AHB-Lite signal definitions
• Global signals
• HCLK: the bus clock source (rising-edge triggered)
• HRESETn: the bus (and system) reset signal (active low)
• Master out/slave in
• HADDR[31:0]: the 32-bit system address bus
• HWDATA[31:0]: the system write data bus
• Control
• HWRITE: indicates transfer direction (Write=1, Read=0)
• HSIZE[2:0]: indicates size of transfer (byte, halfword, or word)
• HBURST[2:0]: indicates single or burst transfer (1, 4, 8, 16 beats)
• HPROT[3:0]: provides protection information (e.g. I or D; user or handler)
• HTRANS: indicates current transfer type (e.g. idle, busy, nonseq, seq)
• HMASTLOCK: indicates a locked (atomic) transfer sequence
• Slave out/master in
• HRDATA[31:0]: the slave read data bus
• HREADY: indicates previous transfer is complete
• HRESP: the transfer response (OKAY=0, ERROR=1)
37
39. Basic read and write transfers with no wait states
39
Pipelined
Address
& Data
Transfer
40. Read transfer with two wait states
40
Two wait states
added by slave
by asserting
HREADY low
Valid data
produced
41. Write transfer with one wait state
41
One wait state
added by slave
by asserting
HREADY low
Valid data
held stable
42. Wait states extend the address phase of next
transfer
42
One wait state
added by slave
by asserting
HREADY low
Address stage of
the next transfer
is also extended
43. Today…
MMIO: Memory-Mapped I/O review
AMBA: Advanced Microcontroller Bus Architecture
APB: Advanced Peripheral Bus
AHB: AMBA High-performance Bus
- Low-level details included for completeness
- But we’ll skip most of these details
43
44. Transfers can be of four types (HTRANS[1:0])
• IDLE (b00)
• No data transfer is required
• Slave must OKAY w/o waiting
• Slave must ignore IDLE
• BUSY (b01)
• Insert idle cycles in a burst
• Burst will continue afterward
• Address/control reflects next transfer in burst
• Slave must OKAY w/o waiting
• Slave must ignore BUSY
• NONSEQ (b10)
• Indicates single transfer or first transfer of a burst
• Address/control unrelated to prior transfers
• SEQ (b11)
• Remaining transfers in a burst
• Addr = prior addr + transfer size
44
45. A four beat burst with master busy and slave
wait
45
One wait state
added by slave
by asserting
HREADY low
Master busy
indicated by
HTRANS[1:0]
46. Controlling the size (width) of a transfer
• HSIZE[2:0] encodes the size
• The cannot exceed the data bus width
(e.g. 32-bits)
• HSIZE + HBURST is determines
wrapping boundary for wrapping
bursts
• HSIZE must remain constant
throughout a burst transfer
46
47. Controlling the burst beats (length) of a
transfer
• Burst of 1, 4, 8, 16, and undef
• HBURST[2:0] encodes the type
• Incremental burst
• Wrapping bursts
• 4 beats x 4-byte words wrapping
• Wraps at 16 byte boundary
• E.g. 0x34, 0x38, 0x3c, 0x30,…
• Bursts must not cross 1KB address
boundaries
47
53. Multi-master AHB-Lite
requires a multi-layer interconnect
• AHB-Lite is single-master
• Multi-master operation
• Must isolate masters
• Each master assigned to layer
• Interconnect arbitrates slave accesses
• Full crossbar switch often
unneeded
• Slaves 1, 2, 3 are shared
• Slaves 4, 5 are local to Master 1
53