4.0 Registers
4.10 Data Path Options
RS8953B/8953SPB
HDSL Channel Unit
The following configuration can cause the HDSL frame to become corrupted:
DBank_1, DBank_2, or DBank_3 is the source of data for HDSL payload byte 33.
DBank_2 is the source of data for HDSL payload byte 0.
The LSB of the DBank_2 pattern is equal to one (1).
0xDE—Data Bank Pattern 3 (DBANK_3)
7
6
5
4
DBANK_3[7:0]
3
2
1
0
DBANK_3[7:0]
Data Bank Pattern 3—Holds a third possible 8-bit pattern for transmit or receive insertion. See
DBANK_1 above. If RSIG_EN = 1 [CMD_6; addr 0xF3], DBANK_3 is a receive signaling
buffer and is not available as an alternate source for receive PCM timeslots. If TAUX_EN = 1
[TCMD_2; addr 0x07], DBANK_3 is a transmit auxiliary channel data buffer and is not
available for insertion into transmit HDSL payload bytes but remains available for insertion
into RSER timeslots.
The following configuration can cause the HDSL frame to become corrupted:
DBank_1, DBank_2, or DBank_3 is the source of data for HDSL payload byte 33.
DBank_3 is the source of data for HDSL payload byte 0.
The LSB or the DBank_3 pattern is equal to one (1).
0xEA—Fill Pattern (FILL_PATT)
7
6
5
4
FILL_PATT[7:0]
3
2
1
0
FILL_PATT[7:0]
Fill Pattern—When PRBS_DIS [CMD_3; addr 0xE7] is set, FILL_PATT replaces the PRBS
generator output with its 8-bit programmable pattern. The transmit Routing Table
[ROUTE_TBL; addr 0xED] may then select FILL_PATT as a fourth possible data bank to fill
idle or unpopulated PCM timeslots and HDSL payload bytes. In this case, FILL_PATT also
establishes an 8-bit pattern checked by the receiver’s BER meter when enabled [BER_EN in
COMBINE_TBL; addr 0xEE].
When PRBS_DIS is zero (PRBS enabled), FILL_PATT is used to initialize the least
significant byte of the PRBS generator’s LFSR. In this case, FILL_PATT must be initialized to
any non-zero value before the MPU issues the PRBS_RST command.
0xE4—Transmit Stuff Bit Value (TSTUFF)
7
—
6
—
5
—
4
—
MAG1
3
2
TSTUFF[3:0]
SIGN1
MAG0
SIGNO
1
0
TSTUFF[3:0]
Transmit Stuffing Bits—Contains the 4-bit STUFF value used by all HDSL transmitters when
any HDSL output frame contains bit stuffing. TSTUFF[0] is the sign bit and first bit of the
first quat transmitted during STUFF words.
4-40
Conexant
N8953BDSB
CONEXANT [ CONEXANT SYSTEMS, INC ]
