XRT72L13 datasheet(151/370 Pages) EXAR

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

REV. 1.0.6

139

2.3.2.86 PMON Holding Register

Each of the PMON registers are 16 bit "Reset-upon-

Read" registers. More specifically, whenever the Mi-

croprocessor intends to read a PMON register, there

are two things to bear in mind.

1. This Microprocessor is going to require two read

accesses in order read out the full 16-bit expres-

sion of these PMON registers.

2. The entire 16-bit expression (of a given PMON

the Microprocessor has completed its first read

access to the PMON register.

Hence, the contents of the other byte (of the partially

read PMON register) will reside within the PMON

Holding register.

2.3.2.87 One Second Error Status Register

Bit 1 - Errored Second

This “Read-Only” bit-field indicates whether or not

there was at least one error within the last one sec-

ond accumulation period.

If no error has occurred (within the last one second

accumulation period) then this bit-field will be set to

“0”. Conversely, if at least one error has occurred

(within the last one second accumulation period) then

this bit-field will be set to “1”.

Bit 0 - Severely Errored Second

This “Read-Only” bit-field indicates whether or not the

error-rate, in the last one second interval was greater

than 1e-3.

If the bit error rate (within the last one second accu-

mulation period) is less than 1e-3, then this bit-field

will be set to “0”. Conversely, if the bit-error rate

(within the last one second accumulation period) is

greater than 1e-3, then this bit-field will be set to “1”.

2.3.2.88 LCV One Second Accumulator Regis-

ter - 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 Framer block, within the

last one-second sampling period. This register con-

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

pression.

PMON HOLDING REGISTER (ADDRESS = 0X6C)

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

PMON Holding Value

RUR

0000

000

ONE SECOND ERROR STATUS REGISTER (ADDRESS = 0X6D)

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

Errored

Second

Severely

Errored

Second

0000

000

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

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

LCV - One Second Count - High Byte

0000

000

XRT72L13 Datasheet(PDF) 151 Page - Exar Corporation

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