IRCC2.0 datasheet(22/87 Pages) SMSC

22 / 87 page

4PPM BOF Counting

The IrCC 2.0 can account for system-dependent

limitations such as long interrupt latencies and

transceiver stabilization times by increasing the

number of PA flags at the beginning of every

4PPM frame (Figure 16).

The BOF COUNT register contains the number

of additional PA bytes that are to be appended to

the standard 4PPM BOF characters. Note: The

BOF COUNT extensions only apply to messages

that start from an idle line state; i.e., BOF

counting

does

not

apply

brick

walled

messages.

4PPM Back-to-Back Frame Transmission

Back-to-back, or brick walled frames are allowed

with 32 or more PA flag bytes between the STO

field of the first frame and the STA field of the

second frame. Additional flags can be added by

programming the Brick Wall Count register.

Note: The BOF COUNT extensions do not apply

to brick walled messages.

ADDR

8-bit Address

Field

DATA

8-bit Control field plus up to 2K - 3 bytes

Information Field

BOF COUNT register

Appends 0 - 4095 PA Bytes

to Beginning of Frame

...

PA (#16)

PA (#1)

STA

8-bit Start

Field

FIGURE 16 - 4PPM EXTENDED BOF

ADDR

8-bit Address

Field

16-byte

Sequence

DATA

8-bit Control field plus up to

2K - 3 bytes Information Field

Brick Walled Frame

Frame

STA

BW COUNT register

Inserts 0 - 4095 PA Bytes

between Brick Walled Frames

STO

16-byte

Sequence

FIGURE 17 - BRICK WALLED 4 MBPS FRAMES

IRCC2.0 Datasheet(PDF) 22 Page - SMSC Corporation

IRCC2.0 Datasheet(HTML) 22 Page - SMSC Corporation

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