28960-SWG-001-A_15 Datasheet, PDF (47/105 Pages) M/A-COM Technology Solutions, Inc. – Software Users Guide

Bt8960
Software User’s Guide
6.0 User Interface
6.2 Serial Communication Interface
6.2 Serial Communication Interface
In a dual processor system (see Figure 6-1), the application controls the bit-pumps using a serial
communication message transfer protocol. The protocol is based on the command set described in
Appendix A, and the command structure as described in the Command Structure section, with
additional requirements for this type of interface.
6.2.1 Communication Protocol
The 8032 communicates with the host processor using a standard UART interface. The physical
connection includes two lines: RXD (8032 pin 10) and TXD (8032 pin 11). The data is transferred
in an asynchronous format: 9600 baud, 1 start bit, 8 data bits, 1 stop bit, no parity.
To select a separate baud rate, refer to the Compiling the Source Code” chapter.
6.2.2 Message Transfer Protocol
The application sends a command to any of the bit-pumps in the system by transmitting a message
over the serial communication channel. Every command that is correctly received and decoded by
the 8032 is acknowledged by sending a special acknowledge message back to the application. In
response to a status request command, the 8032 also sends a status response message that contains
the information requested.
The 8032 is guaranteed to acknowledge a received message within 200 mS, except during
activation where larger delays (up to 2 seconds) may be present. The host processor will usually
retransmit a message that was not acknowledged within this time limit. No new message should be
sent by the host processor before the previous one was acknowledged unless the time limit has been
exceeded.
A status request message requiring information from the bit-pump will first be acknowledged,
and only then will a response message containing the requested information be sent to the host
processor.
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