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D16550 Schematic ( PDF Datasheet ) - Lattice Semiconductor

Teilenummer D16550
Beschreibung Configurable UART
Hersteller Lattice Semiconductor
Logo Lattice Semiconductor Logo 




Gesamt 7 Seiten
D16550 Datasheet, Funktion
www.DataSheet4U.com
D16550
Configurable UART with FIFO
ver 2.11
OVERVIEW
The D16550 is a soft Core of a Universal
Asynchronous Receiver/Transmitter (UART)
functionally identical to the TL16C550A. The
D16550 allows serial transmission in two
modes: UART mode and FIFO mode. In FIFO
mode internal FIFOs are activated allowing 16
bytes (plus 3 bits of error data per byte in the
RCVR FIFO) to be stored in both receive and
transmit directions. D16550 performs serial-to-
parallel conversion on data characters
received from a peripheral device or a
MODEM, and parallel-to-serial conversion on
data characters received from the CPU. The
CPU can read the complete status of the
UART at any time during the functional
operation. Status information reported
includes the type and condition of the transfer
operations being performed by the UART, as
well as any error conditions (parity, overrun,
framing, or break interrupt). D16550 includes
a programmable baud rate generator that is
capable of dividing the timing reference clock
input by divisors of 1 to (216-1), and producing
a 16 × clock for driving the internal transmitter
logic. Provisions are also included to use this
16 × clock to drive the receiver logic. The
D16550 has complete MODEM control
capability, and a processor-interrupt system.
Interrupts can be programmed to the user's
requirements, minimizing the computing
required to handle the communications link.
The separate BAUD CLK line allow to set an
exact transmission speed, while the UART
All trademarks mentioned in this document
are trademarks of their respective owners.
internal logic is clocked with the CPU
frequency.
Two DMA modes are supported: single
transfer and multi-transfer. These modes
allow UART to interface to higher performance
DMA units, which can interleave their
transfers between CPU cycles or execute
multiple byte transfers.
The configuration capability allows user to
enable or disable during Synthesis process
the Modem Control Logic and FIFO's Control
Logic, change the FIFO size. So in
applications with area limitation and where the
UART works only in 16450 mode, disabling
Modem Control and FIFO's allow to save
about 50% of logic resources.
The D16550 has universal microcontroller
interface, allows correct communication with
D16550 no matter how D16550 clock is
related to microcontroller clock. The core is
perfect for applications, where the UART Core
and microcontroller are clocked by the same
clock signal and are implemented inside the
same ASIC or FPGA chip, as well as for
standalone implementation, where several
UARTs are required to be implemented inside
a single chip, and driven by some off-chip
devices. Thanks to universal interface D16550
core implementation and verification are very
simply, by eliminating a number of clock trees
in complete system.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2007 DCD – Digital Core Design. All Rights Reserved.






D16550 Datasheet, Funktion
www.DataSheet4U.com
D16X50 UARTS FAMILY OVERVIEW
The family of DCD D16X50 UART IP Cores combine a high–performance, low cost, and small
compact size, offering the best price/performance ratio in the IP Market. The DCD’s Cores are
dedicated for use in cost-sensitive consumer products, computer peripherals, office automation,
automotive control systems, security and telecommunication applications.
The D16X50 IP Cores are written in pure VHDL/VERILOG HDL languages which make them
technologically independent. All of the D16X50 IP Cores can be fully customized according to
customer needs.
Design
D16450
D16550
D16750
D16552
D16752
D16754
1
1
1
2
2
4
*-Optional
--
2* 16
2* 64
4* 16
4* 64
8* 64
--
--
-
--
D16X50 family of Configurable UARTs with FIFO IP Cores
-* -*
-* -*
-* -*
-* -*
-* -*
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2007 DCD – Digital Core Design. All Rights Reserved.

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