XRT7250 datasheet(374/463 Pages) EXAR

374 / 463 page

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XRT7250

DS3/E3 FRAMER IC

REV. 1.1.1

355

NOTES:

1. The XRT7250 contains mask register bits that per-

mit the user to alter the state of the internally gen-

erated value for these bits.

2. The Transmit LAPD Controller/Buffer can be config-

ured to be the source of the DL bits, within the Out-

bound E3 data stream.

In all, the Transmit Overhead Data Input Interface per-

mits the user to insert overhead data into the Out-

TR - Bit 3

Yes

TR - Bit 2

Yes

TR - Bit 1

Yes

TR - Bit 0

Yes

MA - Bit 7

Yes

MA - Bit 6

Yes

MA - Bit 5

Yes

MA - Bit 4

Yes

MA - Bit 3

Yes

MA - Bit 2

Yes

MA - Bit 1

Yes

MA - Bit 0

Yes

NR - Bit 7

Yes

NR - Bit 6

Yes

NR - Bit 5

Yes

NR - Bit 4

Yes

NR - Bit 3

Yes

NR - Bit 2

Yes

NR - Bit 1

Yes

NR - Bit 0

Yes

GC - Bit 7

Yes

GC - Bit 6

Yes

GC - Bit 5

Yes

GC - Bit 4

Yes

GC - Bit 3

Yes

GC - Bit 2

Yes

GC - Bit 1

Yes

GC - Bit 0

Yes

TABLE 71: A LISTING OF THE OVERHEAD BITS WITHIN THE E3 FRAME, AND THEIR POTENTIAL SOURCES, WITHIN THE

XRT7250 IC

OVERHEAD BIT

INTERNALLY GENERATED

ACCESSIBLE VIA THE TRANSMIT OVERHEAD

DATA INPUT INTERFACE

BUFFER/REGISTER

ACCESSIBLE

XRT7250 Datasheet(PDF) 374 Page - Exar Corporation

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