IA82050_11 Datasheet, PDF (9/22 Pages) InnovASIC, Inc – Asynchronous Serial Controller

IA82050
Asynchronous Serial Controller
3. Functional Overview
Data Sheet
February 25, 2011
3.1 Transmitter
The Transmit function consists of a one-character FIFO, and a Transmit Engine. The transmit
engine is responsible for reading the data out of the FIFO and placing it in the proper order on
the TXD pin. The transmit engine is highly configurable to be compatible with numerous
formats, including 16450 and 8250 modes of communication. Transmit Communication
parameters that can be programmed include:
• Parity modes
• Stop Bits
• Character Length
For more details, see Chapter 5, Register Descriptions.
3.2 Receiver
The Receiver function consists of a one-character FIFO and a receive engine. The receive
engine is responsible for sampling the data on the RXD input pin, formatting the data, and
placing the data in the FIFO. The receive engine is highly configurable with parameters that
include:
• Parity modes
• Stop Bits
• Character Length
For more details, see Chapter 5, Register Descriptions.
3.3 Bus Interface
The Bus Interface is a simple interface that allows a micro-processor or micro-controller to read
and write the IA82050 Registers. It consists of the following I/O lines:
• A0, A1, A2 : 3-Bit Address
• D0-D7 : 8-Bit Data
• RDn: Active Low Read Enable
• WRn: Active Low Write Enable
• CSn: Active Low Chip Select
• INT:
Interrupt Output
• RESET: Chip Reset
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