Parallel Host Interface 16C450/16C550A UART

modem for each data interrupt, instead of only a single byte, as in 16C450 mode. The following diagram shows how the FIFO is used. Host software using this FIFO capability can significantly reduce system overhead by reducing the number of times that interrupt service routines are called.

Figure 12. FIFO Buffers for Transmitter and Receiver

Modem

 

UART

 

 

Transmitter

Host

Transmitter

 

Modem Transmitter FIFO

Holding

(DTE)

Shift

 

Register

Register

 

 

 

(THR)

 

 

 

 

 

UART Transmitter Flow Diagram

 

 

Modem

 

UART

 

 

Receiver

Host

Receiver

 

Modem Receiver FIFO

Buffer

Shift

(DTE)

 

Register

Register

 

(RBR)

 

 

UART Receiver Flow Diagram

 

 

The register addresses are divided into two types: single-register access and multiple-register access. Most of the UART registers are single-register access (that is, only one internal register is accessible for a given register address). UART register addresses 3–7 are used to access a single internal register. The remainder of the UART register addresses (0–2) are used to access two or more internal registers.

Register address 2 is used to write FIFO control information into the FCR (FIFO Control register) and to read the IIR (Interrupt Identity register).

Register address 1 is used to read and write data to the IER (Interrupt Enable register) [when DLAB = 0] and the MS DLM (Divisor Latch register) [when DLAB = 1].

Register address 0 is used to read data from the RBR (Receiver Buffer register) [when DLAB = 0], write data to the THR (Transmitter Holding register) [when DLAB = 0], and read and write to the LS DLL (Divisor Latch register) [when DLAB = 1]. The UART registers and FIFO usage are described in the following sections.

536EX Chipset Developer’s Manual

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Intel Confidential

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Intel 537EX manual Uart, Thr, Rbr
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537EX specifications

The Intel 537EX is a powerful and innovative embedded processor designed for a range of applications, particularly in the fields of industrial automation, telecommunications, and transport management systems. This processor is a member of Intel's embedded product line, tailored specifically to meet the demands of systems that require high reliability and long lifecycle support.

One of the main features of the Intel 537EX is its multi-core architecture, which enables efficient parallel processing capabilities. This allows for the execution of multiple tasks simultaneously, significantly improving overall system performance. The processor also incorporates Intel’s advanced power management technology, which ensures that the device consumes energy efficiently, enhances thermal performance, and prolongs the lifespan of the system.

The Intel 537EX supports a range of connectivity options, including high-speed Ethernet and Serial ATA interfaces. This ensures that it can easily integrate into existing systems, seamlessly supporting applications that require robust data transfer capabilities. Additionally, the processor is equipped with multiple I/O ports, facilitating the connection of various peripherals and sensors, which is crucial in industrial applications.

One of the standout technologies within the Intel 537EX is its support for hardware virtualization. This feature allows for the creation of multiple virtual environments within a single physical structure, optimizing resource utilization and enhancing system flexibility. Additionally, Intel’s integrated security technologies provide a significant layer of protection against potential threats, ensuring that embedded systems remain secure.

Another characteristic of the Intel 537EX is its extensive software support, which includes compatibility with various operating systems and development environments. This versatility makes it an attractive choice for developers looking to build or upgrade their embedded systems. With access to Intel's comprehensive software tools, developers can quickly optimize applications to take full advantage of the processor's capabilities.

The Intel 537EX also boasts excellent thermal performance, allowing it to operate efficiently in harsh environments. This is crucial for embedded applications in industrial settings where temperature fluctuations are common. Overall, the Intel 537EX is engineered to deliver high-performance processing power, superior connectivity, and enhanced security, solidifying its position as a reliable choice for demanding embedded applications.
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