BT8370KPF

Manufacturer Part NumberBT8370KPF
DescriptionFully integrated T1/E1 framer and line interface
ManufacturerConexant Systems, Inc.
BT8370KPF datasheet
 

Specifications of BT8370KPF

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3.16 Data Link Registers
Transmit Data Link 2 Enable—When enabled, the transmitter begins to empty and format the
TDL2_EN
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.
Receive Data Link 2 Enable—When enabled, the receiver begins to format data from the
RDL2_EN
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.
0B2— RDL #2 FIFO Fill Control (RDL2_FFC)
Not available in Bt8376 device.
NOTE:
7
6
5
MSG_FILL[1]
MSG_FILL[0]
FFC[5]
Unformatted Message Fill Limit—Applicable only for Pack8 and Pack6 modes, the message
MSG_FILL[1:0]
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).
T1/E1N
Near Full FIFO Threshold—Selects FIFO depth of near full interrupt [RNEAR; addr 00A] and
FFC[5:0]
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
3-104
Fully Integrated T1/E1 Framer and Line Interface
0 = disabled
1 = enable transmit data link
0 = disabled
1 = enable receive data link
4
3
FFC[4]
FFC[3]
MSG_FILL[1:0]
Message Fill Limit
X
00
0
01
0
10
0
11
1
01
1
10
1
11
Conexant
Bt8370/8375/8376
2
1
0
FFC[2]
FFC[1]
FFC[0]
Disabled
8 bytes
16 bytes
24 bytes
6 bytes
12 bytes
18 bytes
N8370DSE