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| 型號： | MCP2140 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | IrDA Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate(固定波特率,低成本,IrDA標準協(xié)議編譯碼器) |
| 中文描述： | 標準的IrDA協(xié)議?？刂破?，固定通信速率9600波特（固定波特率，低成本，紅外標準協(xié)議編譯碼器） |
| 文件頁數(shù)： | 47/58頁 |
| 文件大?。?/td> | 1001K |
| 代理商： | MCP2140 |
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2003 Microchip Technology Inc.
Preliminary
DS21790A-page 47
MCP2140
B.1.2
IrLAP
The IrLAP protocol provides:
Management of communication processes on the
link between devices
A device-to-device connection for the reliable,
ordered transfer of data
Device discover procedures
Hidden node handling. 115.2 kbaud
Figure B-3
identifies the key parts and hierarchy of the
IrDA protocols. The bottom layer is the Physical layer,
IrPHY. This is the part that converts the serial data to
and from pulses of IR light. IR transceivers can’t trans-
mit and receive at the same time. The receiver has to
wait for the transmitter to finish sending. This is some-
times referred to as a “Half-Duplex” connection. The IR
Link Access Protocol (IrLAP) provides the structure for
packets (or “frames”) of data to emulate data that would
normally be free to stream back and forth.
FIGURE B-3:
IrDA STANDARD PROTOCOL
LAYERS
Figure B-4
shows how the IrLAP frame is organized.
The frame is preceded by some number of Beginning
of Frame characters (BOFs). The value of the BOF is
generally 0xC0, but 0xFF may be used if the last BOF
character is a 0xC0. The purpose of multiple BOFs is to
give the other station some warning that a frame is
coming.
The IrLAP frame begins with an address byte (“A”
field), then a control byte (“C” field). The control byte is
used to differentiate between different types of frames
and is also used to count frames. Frames can carry sta-
tus, data or commands. The IrLAP protocol has a com-
mand syntax of it’s own. These commands are part of
the control byte. Lastly, IrLAP frames carry data. This
data is the information (or “I”) field. The integrity of the
frame is ensured with a 16-bit CRC, referred to as the
Frame Check Sequence (FCS). The 16-bit CRC value
is transmitted LSB first. The end of the frame is marked
with an EOF character, which is always a 0xC1. The
frame structure described here is used for all versions
of IrDA protocols used for serial wire replacement for
speeds up to 115.2 kbaud.
FIGURE B-4:
IrLAP FRAME
In addition to defining the frame structure, IrLAP pro-
vides the “housekeeping” functions of opening, closing
and maintaining connections. The critical parameters
that determine the performance of the link are part of
this function. These parameters control how many
BOFs are used, identify the speed of the link, how fast
either party may change from receiving to transmitting,
etc. IrLAP has the responsibility of negotiating these
parameters to the highest common set so that both
sides can communicate as quickly and reliably as
possible.
Note:
Not supported by MCP2140.
Host O.S. or Application
IrCOMM
IrLAP
IrPHY
Protocols
resident in
MCP2140
IR pulses
transmitted
and
received
IrLMP
–
IAS
Note 1:
The
MCP2140
only
supports
communication baud rate of 9600 baud.
2:
Another IrDA standard that is entering
into general usage is IR Object Exchange
(IrOBEX). This standard is not used for
serial connection emulation.
3:
IrDA communication standards faster
than 115.2 kbaud use a different CRC
method and physical layer.
X BOFs BOF A C
FCS
I
EOF
(1+N) of C0h payload
2
bytesC1h
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