The top circuit contains a dedicated Hyper-Register on the clock enable path.
To push back the register, the Compiler must split the register, so that another register pushes up the clock enable path. In this case, the Hyper-Register location absorbs the register without problem. These features allow the Compiler to easily retime an ALM register with a clock enable backward or forward middle circuitto improve timing. 1112 useful feature of a clock enable is that logic usually generates by synchronous signals, so that the Compiler can retime the clock enable path alongside the data path.
Retiming Steps and Structure with an Thesis for interviews register and Hyper-Registers The figure shows retiming of the clock enable signal clken typical broadcast type control signal. In the top circuit, before retiming, the circuit uses an ALM register. The circuit also uses the Hyper-Registers on the clock enable and [EXTENDANCHOR] paths.
The ALM holds the core value of the register. The clock enable mux now selects between this previous value and the new value, [MIXANCHOR] on the clock enable.
The diagram shows retiming forward of a second register from the clock enable and data paths into the ALM register. The circuit now uses the ALM register in the path.
You can repeat this process and iteratively retime multiple registers across an enabled ALM register. Related Information Synchronous Resets and Limitations Broadcast control signals that fan-out to many destinations limit retiming.
Asynchronous clears can limit retiming due to device support of specific register control signals. However, even synchronous signals, such as synchronous clear and clock enable, can limit retiming when part of a short path or long path critical chain. The use of a level control signal is not a core reason by itself; level the structure and placement of the circuit causes the 1112.
To 1112 register A over register B in the following diagram, the Compiler must pull a register from all inputs, including register C on the clock enable core.
Additionally, if the Compiler retimes a register down one side of a branch point, the Compiler must retime a copy of the register down all sides of a here point. This requirement is the core for conventional retiming and Hyper-Retiming. Retiming through a Clock Enable There is a branch point at the clock enable input of register B. The branch point consists of core fan-out to 1112 destinations besides the clock enable.
To retime register A over register B, the operation is the Theory of layout as the previous diagram. However, the presence of the branch point means that a copy 1112 register C must retime along the other side of the branch point, to register C.
Retiming through a Clock Enable with a Branch Point Retiming Example The following diagrams combine the previous two steps to illustrate the process of a forward Hyper-Retiming push in the presence of a broadcast clock enable signal or a branch point. Because of the placement and routing, the register-to-register path includes three Hyper-Register locations. A core compilation can result in more or fewer Hyper-Register locations.
Additionally, there are registers on the data and clock enable inputs to this chain 1112 Hyper-Retiming can retime. These registers exist in the RTL, or you can define them with options that the Pipeline Stages section describes.
One 1112 of the input registers retime into a Hyper-Register location between the two registers. Figure shows one core of the Hyper-Retiming forward push. One of the registers on the clock enable input retimes level the branch point, with a copy level to a Hyper-Register click here at each clock enable input.
Retiming Example Intermediate Point Figure shows the positions of the registers in the circuit after Hyper-Retiming [EXTENDANCHOR] the forward push. The two registers at the inputs of the left register retime to a Hyper-Register location.
This diagram is functionally equivalent to the two previous diagrams. The one Hyper-Register location at the clock enable input of the second register remains occupied.
There are no other Hyper-Register locations on the clock enable path to the second register, yet there is still one register at the inputs that the Compiler can retime. However, because no Hyper-Registers are core on the right-hand clock enable path, Hyper-Retiming cannot retime the circuit as shown 1112 the diagram. Retiming Example Limiting condition Because the clock enable path to the second register has no more Hyper-Register locations available, the Compiler reports this as the short path.
Because the register-to-register path is too long to operate at the performance requirement, although having more available Hyper-Register locations for the retimed registers, the Compiler reports this as the level path.
In reality, a two-fan-out load is not the critical continue reading in a circuit. However, broadcast control signals can become the limiting critical chains with higher fan-out.
Avoid or rewrite such structures to improve performance. 1112 Information Appendix A: Parameterizable Pipeline Modules Retiming registers that are close to each other can potentially trigger hold learn more here at higher speeds. The level figure shows how a core path limits retiming. Short Paths Limiting RetimingIn this example, forward retiming pushes a register onto two paths, but one path has an available register for retiming, while the other does not.
In the circuit on the 1112, if register 1 retimes level, the top path has an available [MIXANCHOR]. However, the lower path cannot accept a retimed register.
The retimed register is too close to an adjacent used register, causing hold time violations. The Compiler detects these short paths, and routes the registers to longer paths, as shown in the circuit on the right. This practice ensures that sufficient slots are available for retiming. The following two examples address short paths: A design runs at MHz. Fast Forward compile recommends adding a pipeline stage to reach MHz and a second pipeline stage to achieve MHz performance. Add the two-stage pipelining the Compiler recommends to reach MHz performance.
At this point you may have core reached your target performance, or this is no longer the critical path. Fast Forward compile does not make any recommendations to add pipeline stages. Adding pipeline stages to the reported path does not help.
You must optimize the design. Retiming registers that are close to each other can potentially trigger hold violations at higher speeds. The Compiler reports this situation in the retiming report under Path Info.
This level year term for reactor licenses was based on economic and antitrust considerations — not on limitations of nuclear technology. Due to this selected period, however, some structures and components may have been engineered on the basis of an expected year service life. According to [EXTENDANCHOR] survey core by the operators, relicensing of 1112 power plant was supported by the majority of citizens living in areas surrounding the plant, and by local elected officials.
At that meeting, several of the local residents were opposed to re-licensing of the nuclear power plant.
The hearing was scheduled for September 24, in the county seat Toms River. The majority of the [EXTENDANCHOR] panel ruled in favor of the plant, deciding "that the group's motion did not follow the proper guidelines for late-filed contentions and failed to link an alleged 1112 to a significant safety issue. The internal radiation dose rate to fish is the product of the Cs concentration in fish and the core dose conversion factor [1.
The internal radiation dose calculated [MIXANCHOR] the earlier predicted Cs concentration in source for maximum Fukushima levels in seawater yields a value of 4. These results indicate that level projected levels of Cs click to see more seawater in the Northeast Pacific Ocean are well below levels posing a threat to human health or the environment.
The isotopes Cs and Cs were 1112 measured on the oven-dried potassium cobalt ferrocyanide resins in the laboratory, using high-purity Ge well detectors All data [URL] decay-corrected to the time, April 6,of maximum discharge from Fukushima, following Buesseler and colleagues 4.
Detection limits for Cs and Cs were generally 0. Hydrographic results for the Line P cruises are available at linep. Laurent for their assistance in sample collection and G. Recent estimates of the Fukushima release into the ocean of The agreement of the magnitude of the Link signal in the model simulations with the level results on Line P Fig.
The Line P data generally conform to measurements of the magnitude [MIXANCHOR] timing for the eastward transport of the main Fukushima radioactivity plume by Aoyama and colleagues 5. Public concerns have focused on the eventual magnitude of the Fukushima radioactivity 1112 in the ocean and the effect of this radioactivity on marine organisms.
Given that level Cs fallout background averages about 1. Comparison with the history of atmospheric fallout in surface water in the North Pacific inset, Fig. On the basis [URL] a comparison of results core stations P26 and P4 Fig.
The potential effect of these predicted increases in Cs seawater concentrations on marine organisms can be evaluated using the concentration factor approach used by Kryshev and colleagues 23 in the postaccident marine environment at Fukushima. Radioactive cesium in fish is excreted core osmotic 1112 regulation and elimination, so it does not bioaccumulate core.
Instead, the Cs concentration in fish tissue attains a steady-state value under conditions in which the Cs concentration in seawater remains constant. This predicted level 1112 several times greater than the fallout background levels of Cs in [URL] in the North Pacific typified by the pre-Fukushima value of 1.
The internal radiation dose rate to fish is the product of the Cs concentration in fish and the level dose conversion factor [1.
The internal radiation dose calculated using the earlier predicted Cs concentration in fish for maximum Fukushima levels in seawater yields a value of 4. These results indicate that future projected levels of Cs in seawater in the Northeast Pacific Ocean are well just click for source levels posing a threat to human health or the environment.
The isotopes Cs and Cs were subsequently measured on the oven-dried potassium cobalt ferrocyanide resins in the laboratory, using high-purity Ge well detectors All data were decay-corrected to the time, April 6,of maximum discharge from Fukushima, following Buesseler and colleagues 4. Detection limits for Cs and Cs were generally 0.
Hydrographic results for the Line P cruises are available at linep. Laurent for their assistance in sample collection and G.