BT8376EPF datasheet(213/323 Pages) CONEXANT

213 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.16 Data Link Registers

N8370DSE

Conexant

3-95

0A7—RDL #1 FIFO Fill Control (RDL1_FFC)

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 [RDL1; addr 0A8] are filled before the

receive data link generates an RFULL interrupt [ISR2; addr 009] and generates a

corresponding RDL1 Partial message status word entry. Fill limit determines how many bytes

constitute an unformatted message, and also gives 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 specified in 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).

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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