Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
3.16 Data Link Registers
Unformatted data link modes provide transparent channel access in which every data link
bit transmitted is supplied by the processor through TDL2, and each bit received is passed to
the processor through RDL2 [addr 0B3]. Pack8 and Pack6 unformatted mode options select
the number of bits per byte that are stored in transmit/receive FIFOs, 8 or 6 bits, respectively.
In T1 modes, only Pack6 is applicable. In E1, unformatted mode cannot be used if
FAS_MFAS-CAS receive framing is configured. The only data processing performed during
unformatted mode is the alignment of transmitted data bits with respect to the receive and
transmit multiframe. Please see the valid modes for Pack8 and Pack6 in the table shown below.
00 = HDLC with FCS
01 = HDLC without FCS
10 = Unformatted Pack8
11 = Unformatted Pack6
The following initializations are required when Pack8 or Pack6 is selected:
If (Dlink mode == Pack8 or PACK6)
{
DL_TEST[1] = 0x03
** The value DL_TEST[1] = 0x2 is for DLINK#1,
and 0x3 is for DLINK#2.
TEST = 0x02
DL_TEST[5] = 0x60
DL_TEST[5] = 0x10
** DL_TEST[4] is for DLINK #1
** DL_TEST[5] is for DLINK #2
TDL2
TDL2_EOM = 0x0
TEST = 0x0
= 0x0
}
PACK8 and PACK6 would be applicable for the following applications:
Configuration
1
2
3
CR0.T_E1N
E1
E1
T1
CR0.RFRAME
FAS
FAS
Any
FAS_MFAS
FAS_CAS
FAS_MFAS
FAS_CAS
DL1_1CTL.DL
PACK8
PACK8
PACK6
DL1_TS.FRAME
ODD,
EVEN
ALL FRAMES
ALL FRAMES
ODD,
EVEN,
EVERY_
OTHER_
Even
DL1_TS, DL_TS
DL1_BIT, DL_BIT
Any
Any
Any
Any
Any
Two bits or more
N8370DSE
Conexant
3-103
CONEXANT [ CONEXANT SYSTEMS, INC ]
