XRT7250 datasheet(127/463 Pages) EXAR

127 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

108

Bit 1 - Errored Second

This bit field indicates whether or not an error has oc-

curred within the last One-Second accumulation in-

terval. This bit-field will be set to “1” if at least one er-

ror has occurred during the last One-Second accu-

mulation interval. Conversely, this bit-field will be set

to "0" if no errors has occurred during the last one-

second accumulation interval.

Bit 0 - Severely Errored Second

This bit-field indicates whether or not the error rate in

the last one-second interval was greater than 1 in

103. A "0" indicates that the error rate did not exceed

1 in 103 in the last One-Second interval.

2.3.8.13 One-Second Line Code Violation Accu-

mulator Register - MSB

This Read-Only register, along with the LCV - One-

Second Accumulator Register - LSB (Address =

0x6F) contains a 16-bit representation of the number

of LCV (Line Code Violation) Events that have been

detected by the Receive DS3/E3 Framer block, within

the last one-second sampling period. This register

contains the MSB (or Upper-Byte) value of this 16 bit

expression.

2.3.8.14 One-Second Line Code Violation Accu-

mulator Register - LSB

This Read-Only register, along with the LCV - One-

Second Accumulator Register - MSB (Address =

0x6E) contains a 16-bit representation of the number

of LCV (Line Code Violation) Events that have been

detected by the Receive DS3/E3 Framer block, within

the last One-Second sampling period. This register

contains the LSB (or Lower-Byte) value of this 16 bit

expression.

2.3.8.15 One-Second Frame Parity Error Accu-

mulator Register - MSB

ONE-SECOND ERROR STATUS REGISTER (ADDRESS = 0X6D)

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

Errored

Second

Severely

Errored

Second

000

LCV - ONE-SECOND ACCUMULATOR REGISTER - MSB (ADDRESS = 0X6E)

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

LCV - One-Second Count - High Byte

000

LCV - ONE-SECOND ACCUMULATOR REGISTER - LSB (ADDRESS = 0X6F)

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

LCV - One-Second Count - Low Byte

000

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