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Each LE input is directed to different destinations to implement the desired logic function. In both the normal or arithmetic operating modes of the LE, there are six available inputs:. With register packing, the LUT or register output drives the three outputs independently. This feature improves device utilization by using the register and the LUT for unrelated functions.
The LAB-wide synchronous load control signal is not available if you use register packing. This feature speeds up connections between LABs and optimizes local interconnect resources:. Each register has the following inputs:. For combinational functions, the LUT output bypasses the register and drives directly to the LE outputs. Register feedback ensures that the register is packed with its own fan-out LUT, providing another mechanism for improving fitting. These operating modes use LE resources differently.
You can also create special-purpose functions that specify which LE operating mode to use for optimal performance. LEs in normal mode support packed registers and register feedback. The LE in arithmetic mode implements a two-bit full adder and basic carry chain.
LEs in arithmetic mode can drive out registered and unregistered versions of the LUT output. Register feedback and register packing are supported when LEs are used in arithmetic mode.
You can also manually create the carry chain logic during design entry. Parameterized functions, such as LPM functions, automatically take advantage of carry chains for the appropriate functions. To enhanced fitting, a long carry chain runs vertically, which allows fast horizontal connections to M9K memory blocks or embedded multipliers through direct link interconnects. For example, if a design has a long carry chain in an LAB column next to a column of M9K memory blocks, any LE output can feed an adjacent M9K memory block through the direct link interconnect.
If the carry chains run horizontally, any LAB which is not next to the column of M9K memory blocks uses other row or column interconnects to drive a M9K memory block. The direct link connection minimizes the use of row and column interconnects to provide higher performance and flexibility. The direct link connection enables the neighboring elements from left and right to drive the local interconnect of an LAB.
The elements are:. You can use up to eight control signals at a time. Register packing and synchronous load cannot be used simultaneously. Each LAB can have up to four non-global control signals. You can use additional LAB control signals as long as they are global signals. An LAB-wide asynchronous load signal to control the logic for the preset signal of the register is not available.
The register preset is achieved with a NOT gate push-back technique. This chip-wide reset overrides all other control signals. The clock-enable control signal controls the clock entering the input and output registers and the entire M9K memory block. This signal disables the clock so that the M9K memory block does not see any clock edges and does not perform any operations. The rden and wren control signals control the read and write operations for each port of the M9K memory blocks. You can disable the rden or wren signals independently to save power whenever the operation is not required.
You can perform parity checking for error detection with the parity bit along with internal logic resources. The M9K memory blocks support a parity bit for each storage byte. You can use this bit as either a parity bit or as an additional data bit. No parity function is actually performed on this bit. If error detection is not desired, you can use the parity bit as an additional data bit. The byte enable features mask the input data to enable the writing of only specific bytes.
The unwritten bytes retain the previous values. The write enable signal, wren , together with the byte enable signal, byteena , control the write operations on the RAM blocks. By default, the byteena signal is enabled high and only the wren signal controls the writing. Byte enables operate in a one-hot fashion. Byte enables are active high. The byte enable registers do not have a clear port. The read-during-write operation occurs when a read operation and a write operation target the same memory location at the same time.
You can implement two single-port memory blocks in a single block under the following conditions:. By default, the address clock enable signal, addressstall , is disabled and the signal is active low. The M9K memory blocks do not support asynchronous unregistered memory inputs. Single-port mode supports non-simultaneous read and write operations from a single address.
Use the read enable port to control the RAM output ports behavior during a write operation:. You can simultaneously perform one read and one write operations to different locations where the write operation happens on Port A and the read operation happens on Port B. In this memory mode, the M9K memory blocks support separate wren and rden signals.
To save power, keep rden signal low inactive when not reading. The difference is dual-port ROM has an additional address port for read operation. You can use the memory blocks as a shift-register block to save logic cells and routing resources. The size of the shift register must be less than or equal to the maximum number of memory bits 9, bits.
You can cascade memory blocks to implement larger shift registers. A single clock, together with a clock enable, controls all registers of the memory block. In all clock modes, asynchronous clear is available only for output latches and output registers. For independent clock mode, this is applicable on port A and port B.
The Set the maximum block depth parameter allows you to set the maximum block depth of the dedicated memory block you use.
You can slice the memory block to your desired maximum block depth. Use this parameter to save power usage in your devices and to reduce the total number of memory blocks used. However, this parameter might increase the number of LEs and affects the design performance. When the RAM is sliced shallower, the dynamic power usage decreases. However, for a RAM block with a depth of , the power used by the extra LEs starts to outweigh the power gain achieved by shallower slices. The maximum block depth must be in a power of two, and the valid values vary among different dedicated memory blocks.
The IP parameter editor prompts an error message if you enter an invalid value for the maximum block depth. Intel recommends that you set the value of the Set the maximum block depth parameter to Auto if you are unsure of the appropriate maximum block depth to set or the setting is not important for your design.
The Auto setting enables the Compiler to select the maximum block depth with the appropriate port width configuration for the type of internal memory block of your memory. There are several considerations that require your attention to ensure the success of your designs. In the true dual-port RAM mode, you can perform two write operations to the same memory location. However, the memory blocks do not have internal conflict resolution circuitry. To avoid unknown data being written to the address, implement external conflict resolution logic to the memory block.
Customize the read-during-write behavior of the memory blocks to suit your design requirements. Therefore, the output can be a combination of new and old data determined by byteena.
The mixed-port read-during-write mode applies to simple and true dual-port RAM modes where two ports perform read and write operations on the same memory address using the same clock—one port reading from the address, and the other port writing to it. For mixed-port read-during-write operation with dual clocks, the relationship between the clocks determines the output behavior of the memory. Consider the power-up state of the different types of memory blocks if you are designing logic that evaluates the initial power-up values.
All memory blocks support initialization with a. You can create. Even if a memory is preinitialized for example, using a. Only the subsequent read after power up outputs the preinitialized values. Reduce AC power consumption in your design by controlling the clocking of each memory block:.
There are no restrictions on the data width of the multiplier but the greater the data width, the slower the multiplication process. You can control the operation of the embedded multiplier blocks using the following options:. Additionally, you can implement soft multipliers by using the M9K memory blocks as look-up tables LUTs. The LUTs contain partial results from the multiplication of input data with coefficients that implements variable depth and width high-performance soft multipliers.
Using soft multipliers increases the number of available multipliers in the device. Each multiplier input signal can be sent through a register independently of other input signals.
For example, you can send the multiplier Data A signal through a register and send the Data B signal directly to the multiplier. All input and output registers in a single embedded multiplier are fed by the same clock, clock enable, and asynchronous clear signals. Depending on the data width or operational mode of the multiplier, a single embedded multiplier can perform one or two multiplications in parallel.
Each multiplier operand is a unique signed or unsigned number. Two signals, signa and signb , control an input of a multiplier and determine if the value is signed or unsigned.
If the signa signal is high, the Data A operand is a signed number. If the signa signal is low, the Data A operand is an unsigned number.
Intel Cyclone 10 LP Core Fabric and General Purpose I/Os Handbook
EIA Standard. JEDEC is the leading developer of standards for the solid-state industry, they have published over documents to date. Almost representatives, appointed by some JEDEC member companies work together in 50 JEDEC committees to meet the needs of every segment of the industry, manufacturers and consumers alike. The Standards, Publications, and Outlines that they generate are accepted throughout the world. Arlington, Virginia ?
Stub Series Terminated Logic
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