BT8376EPF datasheet(222/323 Pages) CONEXANT

222 / 323 page

Bt8370/8375/8376

3.16 Data Link Registers

Fully Integrated T1/E1 Framer and Line Interface

3-104

Conexant

N8370DSE

TDL2_EN

Transmit Data Link 2 Enable—When enabled, the transmitter begins to empty and format the

contents of the transmit data link FIFO for output during the selected time slot bits, according

to the selected DL2[1:0] mode. It also enables generation of transmitter data link interrupt

events.

0 = disabled

1 = enable transmit data link

RDL2_EN

Receive Data Link 2 Enable—When enabled, the receiver begins to format data from the

selected time slot bits and fill the receive data link FIFO according to the selected DL2[1:0]

mode. It also enables generation of receiver data link interrupt events.

0 = disabled

1 = enable receive data link

0B2—RDL #2 FIFO Fill Control (RDL2_FFC)

NOTE:

Not available in Bt8376 device.

MSG_FILL[1:0]

Unformatted Message Fill Limit—Applicable only for Pack8 and Pack6 modes, the message

fill limit selects how many receive FIFO locations [RDL2; addr 0B3] are filled before the

receive data link generates an RFULL interrupt [ISR1; addr 00A] and before the data link

generates a corresponding RDL2 Partial message status word entry. Fill limits determine how

many bytes constitute an unformatted message, and give the processor an alternative to using

RNEAR interrupts to signal the end of a received unformatted message.

The number of bits per unformatted message must divide evenly by the number of bits

monitored per multiframe. For example, SLC applications monitor Fs-bits during even frames,

for a total of 36 bits monitored out of 72 frames. Using Pack6 mode, that group of 36 Fs-bits

from each SLC multiframe can be chosen to constitute one unformatted message by selecting a

message fill limit which equals 6 bytes (of 6 bits/byte). In the SLC example, an RFULL

interrupt would be generated every 9 ms on each SLC multiframe boundary. Fill limits

provided for T1 cases are multiples of 6 bytes (i.e., 6, 12 or 18 FIFO locations) to hold one or

more multiframes of monitored data. In E1 mode, fill limits are multiples of 8 bytes to

correspond with the 16 frame multiframe lengths (i.e., monitoring CRC4 in MFAS framing

mode, or monitoring TS16 in CAS framing mode).

FFC[5:0]

Near Full FIFO Threshold—Selects FIFO depth of near full interrupt [RNEAR; addr 00A] and

near full level status [RNEAR2; addr 0B4]. The RNEAR interrupt and RNEAR2 indicator are

both activated when the number of empty FIFO locations equals the selected threshold. The

threshold controls how many data and/or status bytes (64 minus threshold value) the processor

MSG_FILL[1]

MSG_FILL[0]

FFC[5]

FFC[4]

FFC[3]

FFC[2]

FFC[1]

FFC[0]

T1/E1N

MSG_FILL[1:0]

Message Fill Limit

Disabled

001

8 bytes

16 bytes

24 bytes

101

6 bytes

12 bytes

18 bytes

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