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PDF CIRCC Data sheet ( Hoja de datos )
| Número de pieza | CIRCC | |
| Descripción | Consumer Infrared Communications Controller | |
| Fabricantes | SMSC Corporation | |
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CIrCC
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Consumer Infrared Communications Controller
FEATURES
• Multi-Protocol Serial Communications
Controller
• Full IrDA v1.0 Implementation: 2.4 kbps to
115.2 kbps
• Consumer Infrared Remote Control Interface
• SHARP Amplitude Shift Keyed Infrared
(ASK IR) Interface
• Direct Rx/Tx Infrared Diode Control (Raw)
and General Purpose Data Pins
• Programmable High-Speed Synchronous
Communications Engine (SCE) with a 32-
Byte FIFO and Programmable Threshold
• Programmable DMA Refresh Counter
• High-Speed NS16C550A-Compatible
Universal Asynchronous Receiver/
Transmitter Interface (ACE UART) with 16-
Byte Send and Receive FIFOs
• ISA Single-Byte and Burst-Mode DMA and
Interrupt-Driven Programmed I/O with Zero
Wait State and String Move Timing
• Automatic Transceiver Control
• Transmit Pulse Width Limiter
• SCE Transmit Delay Timer
• IR Media Busy Indicator
GENERAL DESCRIPTION
This document describes the Consumer Infrared
Communications Controller (CIrCC) function,
which is common to a number of SMSC
products. The CIrCC consists of two main
architectural blocks: the ACE 16C550A UART
and a Synchronous Communications Engine
(SCE) (Figure 2). Each Block is supported by its
own unique register set.
The CIrCC UART-driven IrDA SIR and SHARP
ASK modes are backward-compatible with early
SMSC Super I/O and Ultra I/O infrared
implementations. The CIrCC SCE supports IrDA
version 1.0 and consumer IR modes. All of the
SCE modes use DMA. The CIrCC offers flexible
signal routing and programmable output control
through the Raw mode interface, General
Purpose Data pins and Output Multiplexer.
Hardware decoding of the NEC PPM Consumer
IR Remote Control format is implemented in the
CIrCC. The CIrCC provides a PME output signal
that is used to indicate the occurrence of a valid
CIR Wake-up event. Chip-level address
decoding is required to access the CIrCC register
sets.
1 page  
INTERFACE DESCRIPTION
The Interface Description lists the signals that
are required to place the CIrCC in a larger chip-
level context.
There are four groups of signals in this section:
PORT signals, HOST BUS controls, SYSTEM
controls, and CHIP-LEVEL CONFIGURATION
controls.
Ports
The three Ports (IR, COM, and AUX) provide
external access for serial data and controls. The
active CIrCC encoder is routed through the
Output Multiplexer to the IR, COM, or AUX port.
NAME
IRRx
IRTx
Table 1 - IR Port Signals
SIZE (BITS) TYPE
DESCRIPTION
1
Input
Infrared Receive Data
1 Output Infrared Transmit Data
NAME
CRx
CTx
nRTS
nDTR
nCTS
nDSR
nDCD
nRI
Table 2 - COM Port Signals
SIZE (BITS) TYPE
DESCRIPTION
1
Input
COM Receive Data
1
Output
COM Transmit Data
1
Output
Request to Send
1
Output
Data Terminal Ready
1
Input
Clear To Send
1
Input
Data Set Ready
1
Input
Data Carrier Detect
1
Input
Ring Indicator
Table 3 - AUX Port Signals
(e.g., can be used for high-current drivers for Consumer IR)
NAME SIZE (BITS) TYPE
DESCRIPTION
ARx 1
Input
Aux. Receive Data
ATx
1
Output
Aux. Transmit Data
5
5 Page 
CONSUMER IR (REMOTE CONTROL)
INTRODUCTION
NEC HARDWARE FRAME DECODING
The CIrCC Consumer IR Remote Control block
is a general-purpose programmable
Synchronous Amplitude Shift Keyed serial
communications interface that includes a Carrier
Frequency Divider, a Programmable Receive
Carrier Range Sensitivity Register, Receive and
Transmit Modulators and an NEC PPM Frame
Format Decoder.
The Consumer IR transmit block transfers data
LSB first between the SCE and Output
Multiplexer as a fixed bit-cell serial NRZ data
stream. The components of this block can also
modulate serial data at programmable data rates
and carrier frequencies.
Variable length encoding and message framing
is handled during transmit by system software.
Receive message framing may be handled by
either hardware or software. The high degree of
control afforded to the system software allows for
the support of many encoding methods; including
PPM, PWM and RC-5 Remote Control formats.
General
The CIrCC implements hardware-level decoding
for the NEC Consumer IR Remote Control
format. The hardware decoder may be used to
generate a wake-up event or to send parts of the
received message frame to the FIFO. The No
Care Custom Code (NCCC), No Care Data Code
(NCDC), PME Wake and Frame bits of the
Consumer IR Control register configure the
hardware decoder.
NEC Consumer IR Format
The NEC Consumer IR Remote Control format
specifies a 38kHz carrier, 13ms of sync framing,
and 32 bits of pulse-position modulated (PPM)
message data. The message data includes an 8
bit Custom Code field, an 8 bit Custom Code’
field, an 8 bit Data Code field, and an 8 bit Data
Code’ field. A single frame of the NEC PPM
Consumer Remote Control output is shown in
Figure 5.
Register controls for the Consumer IR hardware
can be found in Register Block Two. They are
the Consumer IR Control Register, the
Consumer IR Carrier Rate Register, the
Consumer IR Bit Rate Register, the Custom
Code Register, the Custom Code’ Register, and
the Data Code Register.
The Custom Code fields in this protocol uniquely
address message frames for specific devices.
The Custom Code fields can be used as a 16 bit
address or as an 8 bit address followed by the
bit-wise complement of the Custom Code field
Custom Code’. The Data Code field is an 8 bit
command code, Data Code’ is the bit-wise
complement of Data Code.
Note: The CIrCC hardware can decode NEC
protocol framing (sync pulse, 32 bit PPM
message data) at any carrier frequency or data
rate, depending on the programmed Carrier
Frequency Divider (CFD) and Bit Rate Divider
(BRD).
11
11 Page | ||
| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet CIRCC.PDF ] | |
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