TL16PC564B, TL16PC564BLV
PCMCIA UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER
SLLS225A – MARCH 1996 – REVISED FEBRUARY 1998
Integrated Asynchronous Communications
Element (ACE) Compatible With PCMCIA
PC Card Standard Release 2.01
Fully Programmable Serial-Interface
Characteristics:
– 5-, 6-, 7-, or 8-Bit Characters
– Even-, Odd-, or No-Parity Bit Generation
and Detection
Consists of a Single TL16C550 ACE Plus
PCMCIA Interface Logic
– 1-, 1 1/2-, or 2-Stop Bit Generation
– Baud-Rate Generation
Provides Common I-Bus/Z-Bus
Microcontroller Inputs for Most Intel and
Zilog Subsystems
Fully Prioritized Interrupt System Controls
Modem Control Functions
Fully Programmable 256-Byte Card
Information Structure (CIS) and 8-Byte Card
Configuration Register (CCR)
Provides TL16C450 Mode at Reset Plus
Selectable Normal TL16C550 Operation or
Extended 64-Byte FIFO Mode
Adds or Deletes Standard Asynchronous
Communication Bits (Start, Stop and
Parity) to or From Serial Data Stream
Selectable Auto-RTS Mode Deactivates
RTS at 14 Bytes in 550 Mode and at
56 Bytes in Extended 550 Mode
Independently Controlled Transmit,
Receive, Line Status, and Data Set
Interrupts
Selectable Auto-CTS Mode Deactivates
Serial Transfers When CTS is Inactive
Subsystem Selectable Serial-Bypass Mode
Provides Subsystem With Direct Parallel
Access to the FIFOs
Available in 100 Pin Thin Quad Flatpack
(PZ) Package
description
†
The TL16PC564B/BLV is designed to provide all the functions necessary for a Personal Computer Memory
Card International Association (PCMCIA) universal asynchronous receiver transmitter (UART) subsystem
interface. This interface provides a serial-to-parallel conversion for data to and from a modem
coder-decoder/digital signal processor (CODEC/DSP) function to a PCMCIA parallel data-port format. A
computer central processing unit (CPU), through a PCMCIA host controller, can read the status of the
asynchronous communications element (ACE) interface at any point in the operation. Reported status
information includes the type of transfer operation in process, the status of the operation, and any error
conditions encountered.
Attribute memory consists of a 256-byte card information structure (CIS) and eight 8-byte card configuration
registers (CCR). The CIS, implemented with a dual-port random-access memory (DPRAM), is available to both
the host CPU and subsystem (modem), as are the CCRs. This DPRAM is used in place of the electrically
erasable programmable read-only memory (EEPROM) normally used for the CIS. At power up, attribute
memory is initialized by the subsystem.
The TL16PC564B/BLV uses a TL16C550 ACE-type core with an expanded 64 × 11 receiver first-in-first-out
(FIFO) memory and a 64 × 8 transmitter FIFO memory. The receiver trigger logic flags have been adjusted in
order to take full advantage of the increased capacity when in the extended mode. In addition, eight of the UART
registers have been mapped into the subsystem (modem) memory space as read-only registers. This allows
the subsystem to read UART status information.
A subsystem-selectable serial-bypass mode has been implemented to allow the subsystem to bypass the serial
portion of the UART and write directly to the receiver FIFO and read directly from the transmitter FIFO. Interrupt
operation is not affected in this mode.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Intel is a registered trademark of Intel System, Inc.
Zilog is a registered trademark of Zilog Incorporated
†
Patent pending
Copyright 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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