4.0 Registers
RS8953B/8953SPB
4.14 Common Status
HDSL Channel Unit
4.14 Common Status
Table 4-11. Common Status Read Registers
Address
Register Label
Bits
Name/Description
0x1D
0x1E
0x1F
0x20
0x28
0x30
0x38
0x39
0x3A
0x3B
0x3C
BER_METER
BER_STATUS
IRR
8
3
8
8
8
8
8
8
5
8
7
Bit Error Rate Meter
BER Meter Status
Interrupt Request Register
DPLL Residual
RESID_OUT_HI
RESID_OUT_LO
IMR
DPLL Residual
Interrupt Mask Register
DPLL Phase Error
Multiframe Sync Phase
Multiframe Sync Phase
Shadow Write
PHS_ERR
MSYNC_PHS_LO
MSYNC_PHS_HI
SHADOW_WR
ERR_STATUS
Error Status
0x1D—Bit Error Rate Meter (BER_METER)
The receive BER meter and the transmit PRBS generator work in conjunction to perform characterization,
installation, maintenance, and diagnostic testing on PCM and HDSL channels. PRBS_MODE and PRBS_DIS
[CMD_3; addr 0xE7] determine which of the four PRBS patterns or constant pattern is checked by the BER
meter.
7
6
5
4
3
2
1
0
BER[7:0]
BER[7:0]
Bit Error Ratio—Contains the total number of logical bit errors counted in real time during the
test measurement interval defined by BER_SCALE [CMD_3; addr 0xE7]. BER stops
counting when the test measurement interval is completed or the counter reaches its maximum
value of 255, after which the BER_METER result is latched until the meter is reset
[BER_RST; addr 0xEF].
NOTE:
BER does not suspend error counting when the HDSL receive framer loses frame
alignment. Any time after test completion [see BER_DONE in BER_STATUS; addr
0x1E], the MPU can calculate an exact Bit Error Ratio, as follows:
BER_SCALE
00
Bit Error Ratio
BER[7:0] ÷ 231
BER[7:0] ÷ 228
BER[7:0] ÷ 225
BER[7:0] ÷ 221
01
10
11
4-60
Conexant
N8953BDSB
CONEXANT [ CONEXANT SYSTEMS, INC ]
