Think of social media, and the first name that almost immediately comes to mind is Mark Zuckerberg.

Kamala Devi Harris was born on October 20, 1964, in Oakland, California, to immigrant parents.

An Indian-origin real estate developer and film producer has purchased 'Friends' star Matthew Perry's Los Angeles home.

Your sweet tooth could depend on your ability to digest sugar  BBC Science FocusView Full coverage on Google News

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According to the latest rumors, the Samsung Galaxy Z Flip FE could be powered by the Exynos 2400 chipset which is surprising.

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Shared by Gator Boys star Paul Bedard, the viral video shows the alligator emerging from his den to the tune of the iconic song.

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The couple, together for nine years, had announced the wedding date in January and were eagerly looking forward to their long-awaited special day.

Siemens Building Technologies division announced it will acquire Enlighted Inc., a smart IoT building technology provider. The transaction is expected to close in Q3’18.

Enlighted Inc.’s core element is an advanced lighting control application. It is based on a patented, software-defined smart sensor that collects and monitors real-time occupancy, light levels, temperatures and energy usage.

The sensor can gauge temperature, light level, motion, energy, and has Bluetooth connectivity.

The Enlighted system works by collecting temperature, light and motion data via its smart sensors. A gateway device carries the information to Energy Manager, a secure browser-based interface to create profiles and adjust settings of the entire Enlighted Advanced Lighting Control System. The Energy manager operates as an analytics device.

The whole system consists of multi-function sensors, distributed computing, a network, and software applications run by Enlighted Inc.

Enlighted Inc.’s main target market is commercial real estate. Key use cases of its intelligent Lighting Control System are energy efficiency, controlling heating, ventilation and air conditioning, and building utilization reports.

Use the Postscapes 'Connected Products Framework' to understand the smart home and buildings eco-system.

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Today's high-performance computing systems often require the designer to instantiate multiple CPU or DSP cores in their subsystem. However, the performance gained by using multiple CPUs comes with additional programming complexity, especially when accessing shared memory data structures and hardware peripherals. CPU cores need to access shared data in an atomic fashion in a multi-core environment. Locking is the most basic requirement for data sharing. A core takes the lock, accesses the shared data structure, and releases the lock. While one core has the lock, other cores are disallowed from accessing the same data structure. Typically, locking is implemented using an atomic read-modify-write bus transaction on a variable allocated in an uncached memory.

This blog shares the AXI4 locking mechanism when implementing an Xtensa LX-based multi-core system on a Xilinx FPGA platform. It uses a dual-core design mapped to a KC705 platform as an example.

Exclusive Access to Accomplish Locking

The Xtensa AXI4 manager provides atomic access using the AXI4 atomic access mechanism. While Xtensa's AXI manager interface generates an exclusive transaction, the subordinate's interface is also expected to support exclusive access, i.e., AXI monitoring. Xilinx BRAM controller's AXI subordinate interface does not support exclusive access, i.e., AXI monitoring: AXI Feature Adoption in Xilinx FPGAs.

Leveraging Xtensa AXI4 Subordinate Exclusive Access

The Xtensa LX AXI subordinate interface supports exclusive access. One approach is to utilize this support and allocate locks in one of the core's local data memories. Ensure that the number of external exclusive managers is configured, typically to the number of cores (Figure 1).

Figure 1

Note that the Xtensa NX AXI subordinate interface does not support exclusive access. For an Xtensa NX design, shared memory with AXI monitoring is required.

In Figure 2, the AXI_crossbar#2 (block in green) routes core#0's manager AXI access (blue connection) to both core's local memories. Core#1's manager AXI (yellow connection) can also access both core's local memories. Locks can be allocated in either core's local data memory.

In-Bound Access on Subordinate Interface

On inbound access, the Xtensa AXI subordinate interface expects a local memory address, i.e., an external entity needs to present the same address as the core would use to access local memory in its 4GB address space. AXI address remap IP (block in pink) translates the AXI system address to each core's local address. For example, assuming locks are allocated in core#0's local memory, core#1 generates an AXI exclusive to access a lock allocated in core#0's local memory (yellow connection). AXI_crossbar#2 forwards transaction to M03_AXI port (green connection). AXI_address_remap#1 translates the AXI system address to the local memory address before presenting it to core#0's AXI subordinate interface (pink connection).

It is possible to configure cores with disjoint local data memory addresses and avoid the need for an address remap IP block. But then it will be a heterogeneous multi-core design with a multi-image build. An address remap IP is required to keep things simple, i.e., a homogeneous multi-core with a single image build. A single image uses a single memory map. Therefore, both cores must have the same view of a lock, i.e., the lock's AXI bus address must be the same for both.

Figure 2

AXI ID Width

Note Xtensa AXI manager interface ID width=4 bits. Xtensa's AXI subordinate interface ID width=12 bits. So, you must configure AXI crossbar#2 and AXI address remap AXI ID width higher than 4. AXI IDs on a manager port are not globally defined; thus, an AXI crossbar with multiple manager ports will internally prefix the manager port index to the ID and provide this concatenated ID to the subordinate device. On return of the transaction to its manager port of origin, this ID prefix will be used to locate the manager port, and the prefix will be truncated. Therefore, the subordinate port ID is wider in bits than the manager port ID. Figure 3 shows the Xilinx crossbar IP AXI ID width configuration.

Figure 3

Software Tools Support

Cadence tools provide a way to place locks at a specific location. For more details, please refer to Cadence's Linker Support Packages (LSP) Reference Manual for Xtensa SDK. .xtos.lock(green) resides in core#0's local memory and holds user-defined and C library locks. The lock segment memory attribute is defined as shared inner (cyan) so that L32EX and S32EX instructions generate an exclusive transaction on an AXI bus. See Figure 4. The stack and per-core Xtos and C library contexts are allocated in local data memory (yellow).

…………..LSP memory map………….
BEGIN dram0
0x40000000: dataRam : dram0 : 0x8000 : writable ;
dram0_0 : C : 0x40000400 - 0x40007fff : STACK : .dram0.rodata .clib.percpu.data .rtos.percpu.data .dram0.data .clib.percpu.bss .rtos.percpu.bss .dram0.bss;
END dram0
…………………
BEGIN sysViewDataRam0
0xA0100000: system : sysViewDataRam0 : 0x8000 : writable, uncached, shared_inner;
lockRam_0 : C : 0xA0100000 - 0xA01003ff : .xtos.lock;
END sysViewDataRam0
…………..

Figure 4

Please visit the Cadence support site for more information on emulating Xtensa cores on FPGAs.

I am working with innovus on a huge design. I found some cells are placed far away from both timing start points and timing end points. I suspect some other timing paths may be near-critical that results in this sub-optimal cell placement; or innovus has to place the cell far away due to congestion of placement or routing.

Is there a way to see why innovus places/moves the cell during place_opt_design or ccopt_design?

Also, is there a way to highlight all timing start points or timing end points that go through a cell? There may be thousands of timing paths through this cell. I tried using report_timing and timing debugger but it is very painful to click the highlight box and highlight the timing paths one by one.

Thank you for your help!

I am trying to remove the cdn_loop_breaker cells from the netlist. 
When I tried the below 2 things, genus synthesis tool removing the cdn_loop_breaker cells but while connecting the cdn_loop_breaker cell input to its proper connection, its somehow misleading the connections

Things i tried:
1.  remove_cdn_loop_breaker -instances *cdn_loop_breaker*
then i just ran remove_cdn_loop_breaker  comand without the -instances switch
2. remove_cdn_loop_breaker  
     
both of the above things are not providing the proper connections after removing the loop_breaker_cells

can anyone suggest the best possible workaround for this please?

Hi all,

I'm trying to model the clock of a clock doubler. The doubler consists of a delay cell and an XOR gate, which generates a pulse on both the rising and falling edge of the input clock. I've created a simple module to evaluate this. In this case, DEL1 and XOR2 are standard library cells. There is a don_touch constraint on both library cells as well as on clk_d.

module top (
input wire clk,
output reg Q);

//Doubler
wire clk_d;
wire clk_2x;
DEL1 u_delay (.I(clk),.Z(clk_d));
XOR2 u_xor (.A1(clk),.A2(clk_d),.Z(clk_2x));

//FF for connecting the clock to some leaf:
always @(posedge clk_2x) Q<=~Q;

endmodule

My SDC looks like this:

create_clock [get_ports {clk}] -name clk_i -period 100
set_clock_latency -rise 0.1 [get_pins u_xor/Z]
set_clock_latency -fall 0.4 [get_pins u_xor/Z]
create_generated_clock -name clk_2x -edges {1 1 2 2 3} -source clk [get_pins u_xor/Z]

The generated clock is correctly generated but the pulse width is zero. I would be expecting that the pulse width is the difference between fall and rise latency but is not applied:

report_clocks:

report_clocks -generated:

clk_2x is disconnected from the FF after syn_generic. What can I do to model some minimum pulse width? Will innovus later on model this correctly with the delay of DEL1?

Hi all, 

I have made a custom cell in Innovus that I will be instantiating into a bigger block, which I will also be using Innovus to do the Place & Route. 

I understand that I can generate a *.lef file and a *.lib file using Innovus. However, I need to also create a *.db file (these format of files are often used in DC Compiler synthesis tool). 

Is there a way to create the *.db file from Innovus? Or, is there a tool that I can use to create this *.db file? 

Thank you for your time. 

I'm trying to write a generic piece of code that will return the layermap file location, with file name, for a variety of projects (which could potential have different layermap file naming conventions. The below code is what I've used to date, but this assumes the file name is xxxx.layermap. I can obviously do some string matching to find it, assuming the various files all contain some common characters. I thought I'd ask if there is a simpler way to find it, I know that this information is automatically loaded into the Xstream out gui, so maybe I can use the same approach to find it.

techLibName=techGetTechFile(cv)~>libName

techLibLayerMap=strcat(ddGetObj(techLibName)~>readPath "/" techLibName ".layermap")

Hi,

My query is regarding importing of layout.

After importing, we see that the imported transistor instances and vias are all referring to the library in which they are imported, instead of referring to the technology library.

Please let me know how we can refer them to the technology library.

Will surely provide more details if my query is unclear.

Thanks,

Mallikarjun.

Hello,

I would like to create a button for my form that prompts the user to click on a cellview and draw a rectangle bounding box, exactly like the one used in the Area and Density Calculator. Can someone please help me with this?

Thanks!

Beto

Hi Team,

I am using the following command in my SKILL script to flatten the hierarchical layouts, it's working fine for all the instances and mosaics but not for techLib via's please help me with the command to use for flattening the techLib via.

dbFlattenInst( inst 2 nil)

dbFlattenInst( inst1 2 t t nil nil t t)

Regards,

MT.

Hello,

I was looking to destructively and efficiently modify a list that was passed in as an argument to a procedure, by prepending an item to the list.

I noticed that cons lets you do this efficiently, but the operation is non-destructive. Hence this wouldn't work if you are trying to modify a function's list parameter in place.

Here is an example of trying to add "0" to the front of a list:

A new Python library has been written to facilitate an interface between Python and AWR software using a command structure that adheres more closely to Python coding conventions. This library is labeled "pyawr-utils" and it is installed using the standard Python pip command. Comprehensive documentation for installing and using pyawr-utils is available.(read more)

Thermal analysis with the Cadence Celsius Thermal Solver integrated within the AWR Microwave Office circuit simulator gives designers an understanding of device operating temperatures related to power dissipation. That temperature information can be introduced into an electrothermal model to predict the impact on RF performance.(read more)

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I am scripting gds streamin using 'strmin', which works fine so far.

But, as it apparently doesn't have an option to specify where the cds.lib file is, I have to run it from the directory where the cds.lib file is, or I guess I could create a dummy one to source that one.

Is there a way to tell strmin where the cds.lib file is?

Dear all, 

I'm trying to perform an LVS check using Calibre between a layout that was generated by Innovus and the initial netlist generated by Genus. However, once I hit Run LVS on Calibre, it reports the following warnings and recommends to stop the process:

Source netlist references but does not define more than 10 subckts:
DFD1BWP7T
DFKCND1BWP7T
DFKCNQD1BWP7T
DFKSND1BWP7T
DFQD1BWP7T
IND2D0BWP7T
INR2D0BWP7T
INVD0BWP7T
INVD2P5BWP7T
IOA21D0BWP7T
... (and more)

If I proceed the LVS process it shows lots of errors as shown in the following image:

Why Genus doesn't include the definition of those sub circuits in the generated netlist? Is this related to Flat/Hierarchy netlisting? 

I have included my Genus scripts as well as the generated netlist in the attachments (and here - if attachment don't work).

Many thanks,

Anas

Hi,

I find there is a similar question 10 years ago and the answer is out of date, so I come to ask again.

I have compiled 2 different blocks in 2 different paths, using basic xrun -f xxxx.f, generated 2 xcelium.d folder.

Then I have to compile another block based on these 2, how can I link these 2 generated libraries while compiling the 3rd one?

Thanks

I was trying to remove the cdn_loop_breaker cells from the netlist. 
When I tried the below 2 things, it removing the cdn_loop_breaker cells but while connecting the cdn_loop_breaker cell input to its proper connection, its somehow misleading the connections

Things i tried:
1.  remove_cdn_loop_breaker -instances *cdn_loop_breaker*
then i just ran remove_cdn_loop_breaker  comand without the -instances switch
2. remove_cdn_loop_breaker  
     
both of the above things are not providing the proper connections after removing the loop_breaker_cells

I am trying to understand the Linting process. I know that mainly JasperGold is the tool for this purpose. Though I think JasperGold is more suited for later stages of the design. As a RTL Design Engineer, I want to make sure that if another tool has the capability of doing Linting earlier in the flow. for example, does Xcelium, Genus or Confomal support linting. I have seen some contradicting information online regarding this topic, though I can't find anything related to Linting on any of these tools.

Thanks

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