IRCC SMSC Corporation, IRCC Datasheet - Page 55

• Manufacturer Part Number: IRCC
• Description: INFRARED COMMUNICATIONS CONTROLLER
• Manufacturer: SMSC Corporation

DESCRIPTION
The SCE is a half-duplex synchronous serial
communications controller that controls data flow
between the Bus Interface I/O block and the IrDA
FIR
FRAMING
The SCE operates with and without framing.
With framing implies that the SCE works with the
IrDA FIR encoder/decoder so the required
symbols for the non-payload data portions of the
.576Mbps, 1.152Mbps and 4Mbps packets can
be generated.
SCE acts simply as serial-to-parallel converter
for the Consumer IR (TV Remote) encoder/
decoder.
ACTIVE FRAME INDICATOR
The SCE signal nActiveFrame is a PLA state
variable that is synchronized to both IrDA FIR
and
nActiveFrame cycles high and low for each
message frame, regardless of the state of the
Brick Wall bit. nActiveFrame is primarily used to
trigger active frame interrupts and to advance the
Message Count bits that control hardware
access to the Line Status Registers.
and
Consumer
Consumer
Without framing implies that the
Transmit
Controls
Receive
IR
IR
message
8
8
FIGURE 20 - SCE BLOCK DIAGRAM
(TV
Parallel-to-Serial
Serial-to-Parallel
Control
Remote)
Timing
frames.
Converter
Converter
&
55
CRC Generator
Encoders (Figure 20). The SCE also includes
partial full-duplex loopback functionality for
diagnostic testing.
4Mbps are supported. All of the SCE register
controls are located in the nSCE-addressable 8-
bit Register Blocks.
IrDA Modes
Transmit
nActiveFrame goes active as soon as the IrDA
transmitter
nActiveFrame becomes inactive as soon as the
IrDA transmitter completes an EOF sequence.
In the case of a transmit abort, nActiveFrame
becomes inactive as soon as the IrDA transmitter
completes the abort sequence.
Receive
nActiveFrame goes active as soon as the IrDA
receiver detects valid payload data; i.e., after a
valid BOF sequence.
inactive as soon as the IrDA receiver detects an
EOF sequence. In the case of a FIFO Overrun
or abort, nActiveFrame becomes inactive as
soon as the IrDA receiver updates the status
register and signals the End of Message.
CRC Checker
16/32-bit
16/32-bit
1
1
initiates
Encoder
Decoder
Bit rates from .4Kbps to
FIR/TV
FIR/TV
nActiveFrame becomes
a
BOF
sequence.