DS2196 datasheet(92/157 Pages) DALLAS

92 / 157 page

DS2196

92 of 157

BIR: BERT INFORMATION REGISTER (Address = 43 Hex)

(Refer to Section 7 for explanation of reading latched register bits)

(MSB)

(LSB)

–

RA1

RA0

RLOS

BED

BBCO

BEC0

SYNC

SYMBOL

POSITION

NAME AND DESCRIPTION

–BIR.7

Not Assigned. Maybe any value when read.

RA1

BIR.6

Receive All 1’s (RA1). A latched bit which is set when 32

consecutive 1’s are received. Allowed to be cleared once a 0 is

received.

RA0

BIR.5

Receive All Zeros (RA0). A latched bit which is set when 32

consecutive zeros are received. Allowed to be cleared once a 1

is received.

RLOS

BIR.4

Receive Loss Of Synchronization (RLOS). A latched bit

which is set whenever the receive BERT begins searching for a

pattern. Once synchronization is achieved, this bit will remain

set until read.

BED

BIR.3

Bit Error Detected (BED). A latched bit which is set when a

bit error is detected. The receive BERT must be in

synchronization for it detect bit errors. Cleared when read. Can

generate interrupts if enabled via IEBED (BC1.6).

BBCO

BIR.2

BERT Bit Counter Overflow (BBCO). A latched bit which is

set when the 32-bit BERT Bit Counter (BBC) overflows.

Cleared when read and will not be set again until another

overflow occurs. Can generate interrupts if enabled via IEOF

(BC1.5).

BECO

BIR.1

BERT Error Counter Overflow (BECO). A latched bit

which is set when the 24-bit BERT Error Counter (BEC)

overflows. Cleared when read and will not be set again until

another overflow occurs. Can generate interrupts if enabled via

IEOF (BC1.5).

SYNC

BIR.0

Real Time Synchronization Status (SYNC). Real time status

of the synchronizer (this bit is not latched). Will be set when

the incoming pattern matches for 32 consecutive bit positions.

Will be cleared when 6 or more bits out of 64 are received in

error. Can generate interrupts on change of state if enabled via

IESYNC (BC1.7).

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