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ST16C554D Fiches technique(PDF) 11 Page - Exar Corporation

No de pièce ST16C554D
Description  QUAD UART WITH 16-BYTE FIFOS
Download  40 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C554D Fiches technique(HTML) 11 Page - Exar Corporation

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ST16C554/554D/68C554
11
Rev. 3.10
GENERAL DESCRIPTION
The 554D provides serial asynchronous receive data
synchronization, parallel-to-serial and serial-to-paral-
lel data conversions for both the transmitter and
receiver sections. These functions are necessary for
converting the serial data stream into parallel data that
is required with digital data systems. Synchronization
for the serial data stream is accomplished by adding
start and stops bits to the transmit data to form a data
character (character orientated protocol). Data integ-
rity is insured by attaching a parity bit to the data
character. The parity bit is checked by the receiver for
any transmission bit errors. The electronic circuitry to
provide all these functions is fairly complex especially
when manufactured on a single integrated silicon
chip. The ST16C554D represents such an integration
with greatly enhanced features. The 554D is fabri-
cated with an advanced CMOS process to achieve low
drain power and high speed requirements.
The 554D is an upward solution that provides 16 bytes
of transmit and receive FIFO memory, instead of 1
bytes provided in the 16/68C454. The 554D is de-
signed to work with high speed modems and shared
network environments, that require fast data process-
ing time. Increased performance is realized in the
554D by the larger transmit and receive FIFOs. This
allows the external processor to handle more network-
ing tasks within a given time. This increases the
service interval giving the external CPU additional
time for other applications and reducing the overall
UART interrupt servicing time.
The 554D combines the package interface modes of
the 16C554D and 68C554 series on a single inte-
grated chip. The 16 mode interface is designed to
operate with the Intel type of microprocessor bus while
the 68 mode is intended to operate with Motorola, and
other popular microprocessors. Following a reset, the
554D is down-ward compatible with the ST16C454/
ST68C454 dependent on the state of the interface
mode selection pin, 16/-68.
The 554D is capable of operation to 1.5Mbps with a 24
MHz crystal or external clock input. With a crystal of
14.7464 MHz, the user can select data rates up to
921.6Kbps.
The rich feature set of the 554D is available through
internal registers. Selectable receive FIFO trigger
levels, selectable TX and RX baud rates, modem
interface controls. In the 16 mode INTSEL and MCR
bit-3 can be configured to provide a software con-
trolled or continuous interrupt capability. Due of pin
limitations for the 64 pin 554D this feature is offered by
two different QFP packages. The ST16C554DCQ64
operates in the continuos interrupt enable mode by
bonded INTSEL to VCC internally. The
ST16C554CQ64 operates in conjunction with MCR
bit-3 by bonding INTSEL to GND internally.
FUNCTIONAL DESCRIPTIONS
Interface Options
Two user interface modes are selectable for the 554D
package. These interface modes are designated as
the “16 mode” and the “68 mode.” This nomenclature
corresponds to the early 16C554D and 68C554 pack-
age interfaces respectively.
The 16 Mode Interface
The 16 mode configures the package interface pins for
connection as a standard 16 series (Intel) device and
operates similar to the standard CPU interface avail-
able on the 16C554D. In the 16 mode (pin 16/-68 logic
1) each UART is selected with individual chip select
(CSx) pins as shown in Table 2 below.
Table 2, SERIAL PORT CHANNEL SELECTION
GUIDE, 16 MODE INTERFACE
-CSA -CSB -CSC -CSD
UART
CHANNEL
1111
None
0111
A
1011
B
1101
C
1110
D


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