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UART with 16-byte FIFO buffers. Up to 1.5 Mbit/s. The ST16C155X is not compatible with the industry standard 16550 and will not work with the standard serial port driver in Microsoft Windows. 16C2450: Dual UART with 1-byte FIFO buffers. 16C2550: Dual UART with 16-byte FIFO buffers. Pin-to-pin and functional compatible to 16C2450.
An on-chip FIFO buffer for both incoming and outgoing data; this gives the host system more time to respond to an interrupt generated by the UART, without loss of data. Both the computer hardware and software interface of the 16550 are backward compatible with the earlier 8250 UART and 16450 UART .
The original Verilog simulator, Gateway Design's Verilog-XL was the first (and only, for a time) Verilog simulator to be qualified for ASIC (validation) sign-off. After its acquisition by Cadence Design Systems, Verilog-XL changed very little over the years, retaining an interpreted language engine, and freezing language-support at Verilog-1995.
FIFO's opposite is LIFO, last-in-first-out, where the youngest entry or "top of the stack" is processed first. [2] A priority queue is neither FIFO or LIFO but may adopt similar behaviour temporarily or by default. Queueing theory encompasses these methods for processing data structures, as well as interactions between strict-FIFO queues.
Released under the GNU General Public License, Icarus Verilog is free software, an alternative to proprietary software like Cadence's Verilog-XL. As of release 0.9, Icarus is composed of a Verilog compiler (including a Verilog preprocessor) with support for plug-in backends, and a virtual machine that simulates the design.
Verilog's 'event' primitive allowed different blocks of procedural statements to trigger each other, but enforcing thread synchronization was up to the programmer's (clever) usage. SystemVerilog offers two primitives specifically for interthread synchronization: mailbox and semaphore. The mailbox is modeled as a FIFO message queue.
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Unlike in software compiler design, where the register-transfer level is an intermediate representation and at the lowest level, the RTL level is the usual input that circuit designers operate on. In fact, in circuit synthesis, an intermediate language between the input register transfer level representation and the target netlist is sometimes ...