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CIRCC Schematic ( PDF Datasheet ) - SMSC Corporation

Teilenummer CIRCC
Beschreibung Consumer Infrared Communications Controller
Hersteller SMSC Corporation
Logo SMSC Corporation Logo 




Gesamt 70 Seiten
CIRCC Datasheet, Funktion
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.






CIRCC Datasheet, Funktion
NAME
D0-D7
A0-A2
nIOR
nIOW
AEN
DRQ
nDACK
TC
IRQ
IOCHRDY
nSRDY
SIZE (BITS)
8
3
1
1
1
1
1
1
1
1
1
Table 4 - HOST Signals
TYPE
DESCRIPTION
Bi-directional
Host Data Bus
Input
CIrCC Register Address Bus
Input
ISA I/O Read
Input
ISA I/O Write
Input
ISA Address Enable
Output
DMA Request
Input
ISA DMA Acknowledge
Input
ISA DMA Terminal Count
Output
Interrupt Request
Output
ISA I/O Channel Ready
Output
ISA Synchronous Ready (Zero Wait State)
6

6 Page









CIRCC pdf, datenblatt
SCE
Encoder/Decoder
Tx Enable
Clock
Carrier Off
Transmit Bit-Rate
Divider
Carrier Frequency
Divider
CIR Tx
Receive Bit-Rate
Divider
Rx Enable Sync
Programmable
Receive Carrier
Sense
Range
CIR Rx
FIGURE 4 - CIrCC CONSUMER IR (REMOTE CONTROL) BLOCK
C C C C C C C C C’ C’ C’ C’ C’ C’ C’ C’ D D D D D D D D D’ D’ D’ D’ D’ D’ D’ D’
01 2 3 4 56 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
Leader Code
C ustom C ode
C ustom C ode’
D ata C ode
1.125m s
D ata C ode
9m s
.5625m s
4.5m s
2.25m s
01
8 .7 7 u s
38K H z C arrier
2 6 .3 u s
(9m s or .5625m s)
FIGURE 5 - NEC PPM CONSUMER REMOTE CONTROL OUTPUT
12

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