CIRCC datasheet(54/70 Pages) SMSC

54 / 70 page

SCE

The SCE is a half-duplex synchronous serial

communications controller that directs data flow

between the Bus Interface I/O block and the

Consumer IR (Remote Control) Encoder (Figure

20).

The

SCE

also

includes

partial

full-

duplex

loopback

functionality

for

diagnostic

testing.

Bit rates from .4kbps to 100kbps are

supported. All of the SCE register controls are

located in the nSCE-addressable 8-bit register

blocks.

FRAMING

The SCE operates with and without framing,

depending on the state of the FRAME bit in the

Consumer IR Remote Control register in SCE

SCE works with the NEC Consumer IR decoder

so that the required portions of the frame

message can be extracted and placed in the 32

byte FIFO. Without framing implies that the SCE

operates simply as a serial-to-parallel converter

for

the

Consumer

(Remote

Control)

encoder/decoder.

ACTIVE FRAME INDICATOR

The SCE signal nActiveFrame is a PLA state

variable that is synchronized to Consumer IR

message frames.

nActiveFrame is primarily

used to trigger active frame interrupts.

Transmit

nActiveFrame goes active as soon as the

Consumer IR transmitter starts modulating the

SCE data stream.

nActiveFrame becomes

inactive as soon as the transmit register is

empty.

Receive

When the

FRAME bit is zero, nActiveFrame

goes active as soon as the Consumer IR

receiver detects the first active bit-time of

infrared energy. nActiveFrame becomes inactive

whenever the Consumer IR receiver is manually

disabled, a DMA Terminal Count has occurred,

or following a FIFO Overrun.

When the FRAME bit is one, nActive Frame goes

active as soon as the NEC PPM frame format

decoder detects valid data following the leader

code. nActive Frame becomes inactive as soon

as the receiver updates the line status register

and signals an End-Of-Message following a FIFO

overrun.

Serial-to-Parallel

Converter

Parallel-to-Serial

Converter

Tim ing

Control

Transm it

Receive

Controls

CIR

Encoder

CIR

Decoder

FIGURE 20 - SCE BLOCK DIAGRAM

CIRCC Datasheet(PDF) 54 Page - SMSC Corporation

CIRCC Datasheet(HTML) 54 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70

Datasheet Download

Link URL