BT8376EPF datasheet(216/323 Pages) CONEXANT

216 / 323 page

Bt8370/8375/8376

3.16 Data Link Registers

Fully Integrated T1/E1 Framer and Line Interface

3-98

Conexant

N8370DSE

RMPTY1

Receive FIFO Empty—Indicates no data or status bytes are present in the receive data link

FIFO.

0 = FIFO contains data or status as indicated by RSTAT1

1 = FIFO empty

RNEAR1

Receive FIFO Near Full—Indicates the data link has filled the receive FIFO to the near full

threshold level specified in FFC[5:0]. Upon reaching that level, the receiver updates the

message status byte [WORD0] placed on top of the FIFO and reports the current in-progress

message with a Partial end of message status. The processor must read those filled FIFO

locations to clear the RNEAR1 status indicator and enable the next RNEAR interrupt.

0 = FIFO depth is below the near full level

1 = FIFO is filled to the near full level

RFULL1

Receive FIFO Full—Indicates the data link has completely filled 64 byte locations in the

receive FIFO. In all cases, RFULL1 is an error indicating that the processor did not keep pace

with the receiver and that one or more received messages were discarded after the FIFO

became full. The FIFO can still contain one or more Good received messages, and the

processor can still process all receive FIFO contents as usual. However, any message in

progress when FIFO reached full is discarded and reported with a Partial end of message status

and a 0 byte count (which distinguishes a full end of message status from a normal abort or

error message status).

0 = FIFO is less than full

1 = FIFO has been completely filled

0AA—Performance Report Message (PRM)

AUTO_PRM

Automatic PRM Insertion—AUTO_PRM instructs the data link transmitter to format and send

a Performance Report Message on the selected transmit channel after each occurrence of the

ONESEC interrupt. To meet PRM requirements specified in ANSI T1.403-1995, both FCS

mode [DL1_CTL; addr 0A6] and 1-second error count latching [LATCH_CNT; addr 046]

must be enabled, and the data link channel must be selected to output on Facility Data Link

(FDL) framing bits [DL1_TS=0x40; addr 0A4]. Octets 1–14 of the transmit PRM message

contents are automatically encoded (as shown in Figure A-5, Performance Report Message

Structure), based on the number of received CRC, FPS, LCV, SEF, and FRED errors

[addr 050-05A]. RFSLIP errors [SSTAT; addr 0D9] are also automatically encoded if

AUTO_SL (described below) is enabled. The remaining PRM message contents typically

remain fixed and are supplied by the processor from other bits that follow in the PRM register.

BOP priority codeword transmissions are interrupted by AUTO_PRM, if TDL1 is granted

output priority [TBOP_MODE=11; addr 0A0].

AUTO_PRM messages take up no space in the transmit data link FIFO, but are inserted on

the transmit channel only after the FIFO is empty. Therefore, if the processor needs to transmit

another type of FDL message between PRM messages, the processor must write that message

after AUTO_PRM has begun sending (i.e., after ONESEC interrupt).

0 = no automatic PRM

1 = send PRM automatically every ONESEC

AUTO_PRM

PRM_CR

PRM_R

PRM_U1

PRM_U2

PRM_SL

AUTO_SL

SEND_PRM

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