RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 116

• Manufacturer Part Number: RS8953
• Description: High-bit-rate Digital Subscriber Line (hdsl) Channel unit
• Manufacturer: Conexant Systems, Inc.

4.0 Registers
4.11 Common Command
BER_SEL[1:0]
MSYNC_MEAS
RSIG_EN
RAUX_EN
RAZ_1–RAZ_3
4-48
0xF3—Command Register 6 (CMD_6)
7
RAZ_[1:3]
BER/PRBS Mode—Selects the BER meter source, the PRBS generator output direction, and
serial or framed data formats. Refer to
MSYNC Phase Measurement—Selects whether TMSYNC or RMSYNC phase is measured
with respect to MSYNC. The result is reported in MSYNC_PHS [addr 0x39].
Receive Signaling Table Enable—Applicable only for an LTU in a P2MP application. When
active, the Receive Signaling Table [RSIG_TBL; addr 0xF2] grooms the ABCD signaling
from two or three remote sites and routes the groomed signal via DBANK_3 in the receive
Combination Table [COMBINE_TBL; addr 0xEE]. When inactive, RSIG_TBL is unused and
the receive combination table regains use of DBANK_3.
Receive Auxiliary Enable—The RAUX1–RAUX3 outputs share the same pins with DROP,
INSERT, and MSYNC, respectively. RAUX_EN determines which signals are output on these
shared pins.
Receive Auxiliary Z-bit Enable—Applicable only when RAUX_EN is active. RAZn
(n = 1,2,3) selects whether ROHn marks the output of all overhead and Z-bits or the output of
only the last 40 Z-bits. If enabled, ROHn is high for one BCLKn, coincident with each of the
last 40 Z-bits output on RAUXn. Otherwise, all data passed into the RFIFO is marked high by
ROHn.
6
5
0 = TMSYNC to MSYNC phase measurement
1 = RMSYNC to MSYNC phase measurement
0 = Normal receive
1 = Enable receive signaling table
0 = DROP, INSERT, or MSYNC outputs enabled
1 = RAUXn outputs enabled
0 = ROHn marks all non-payload data
1 = ROHn marks only the last 40 Z-bits
BER_SEL
00
01
10
11
RAUX_EN
4
Conexant
PCM Framed PRBS outputs data under control of ROUTE_TBL.
PCM Serial PRBS output replaces RSER data. BER monitors
Normal
Mode
—
Figure
RSIG_EN
3
3-12.
PRBS outputs data under control of ROUTE_TBL.
BER monitors data selected by COMBINE_TBL.
Reserved
BER monitors TSER during the same timeslots
selected by ROUTE_TBL. TCLK and RCLK must
be identical. If accompanied by loopback on HDSL
side, framed PCM channels are tested.
all data at TSER. TCLK and RCLK must be
identical.
MSYNC_MEAS
2
Mode Description
RS8953B/8953SPB
1
HDSL Channel Unit
BER_SEL[1:0]
N8953BDSB
0