XRT7250 datasheet(108/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

Bits 3 - 0 F-Bit Mask[27:24]

These Read/Write bit-fields permit the user to insert

errors into the first four F-bits of a DS3 M-frame, for

test and diagnostic purposes. The Transmit DS3

Framer block automatically performs an XOR opera-

tion on the actual contents of these F-bit fields to

these register bit-fields. Therefore, for every "1" that

exists in these bit-fields, this will result in a change of

state for the corresponding F-bit, prior to being trans-

mitted to the Far-End Receive DS3 Framer.

If the Transmit DS3 Framer is to be operated in the

normal mode (e.g., when no errors are being injected

into these F-bit fields of the outbound DS3 frames),

then all of these bit-fields must be "0’s".

2.3.5.8

Transmit DS3 F-Bit Mask Register - 2

(DS3 Applications)

Bits 7 - 0 F-Bit Mask[23:16]

These Read/Write bit-fields permit the user to insert

errors into the fifth through twelfth F-bits of a DS3 M-

frame, for test and diagnostic purposes. The Trans-

mit DS3 Framer block automatically performs an XOR

operation on the actual contents of these F-bit fields

to these register bit-fields. Therefore, for every "1"

that exists in these bit-fields, this will result in a

change of state for the corresponding F-bit, prior to

being transmitted to the Remote Terminal Equipment.

If the Transmit DS3 Framer block is to be operated in

the normal mode (e.g., when no errors are being in-

jected into these F-bit fields of the outbound DS3

frames), then all of these bit-fields must be "0’s".

2.3.5.9

Transmit F-Bit Mask Register - 3 (DS3

Applications)

Bits 7 - 0 F-Bit Mask[15:8]

These Read/Write bit-fields permit the user to insert

errors into the thirteenth through twentieth F-bits of a

DS3 M-frame, for test and diagnostic purposes. The

Transmit DS3 Framer block automatically performs an

XOR operation on the actual contents of these F-bit

fields to these register bit-fields. Therefore, for every

"1" that exists in these bit-fields, this will result in a

change of state for the corresponding F-bit, prior to

being transmitted to the Remote Terminal Equipment.

If the Transmit DS3 Framer block is to be operated in

the normal mode (e.g., when no errors are being in-

jected into these F-bit fields of the outbound DS3

frames), then all of these bit-fields must be "0’s".

2.3.5.10 Transmit F-Bit Mask Register - 4 (DS3

Applications)

TXDS3 F-BIT MASK REGISTER - 1 (ADDRESS = 0X36)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Not Used

FBit Mask[27] FBit Mask[26] FBit Mask[25] FBit Mask[24]

R/W

0000

000

TXDS3 F-BIT MASK REGISTER - 2 (ADDRESS = 0X37)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

FBit Mask[23] FBit Mask[22] FBit Mask[21] FBit Mask[20] FBit Mask[19] FBit Mask[18] FBit Mask[17] FBit Mask[16]

R/W

0000

000

TXDS3 F-BIT MASK REGISTER - 3 (ADDRESS = 0X38)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

FBit Mask[15] FBit Mask[14] FBit Mask[13] FBit Mask[12] FBit Mask[11] FBit Mask[10]

FBit Mask[9]

FBit Mask[8]

R/W

0000

000

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