Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
3.14 Clock Rate Adapter Registers
OSEL[3:0]
CLADO Frequency Select—Picks one of eight CLAD divider chain frequencies to output on
the CLADO pin. (Refer to Table 2-8, CLADO Frequencies Selection through 2-9 for
programming examples with various input timing references.)
OSEL
0000
0001
0010
0011
0100
0101
0110
0111
CLADO Frequency (kHz)
1024
2048
4096
8192
2560
1544
1536
XSEL
Multiplier = T1/E1 line rate x 2
(addr 090)
1xxx
16,384
092—CLAD Phase Detector Scale Factor (CPHASE)
7
6
5
4
3
2
1
0
—
RSCALE[2]
RSCALE[1]
RSCALE[0]
—
VSCALE[2]
VSCALE[1]
VSCALE[0]
RSCALE[2:0]
CLAD Reference Scale Factor—Divides CLADI signal by 2[RSCALE] to form CLADR input to
CPHASE detector. Applicable only if CEN [addr 090] is active. Allows the system to supply
CLADI frequency, up to a maximum of 128 times the desired CLADR reference frequency.
RSCALE
000
Scale Factor
CLADR Reference
CLADR = CLADI
1
2
CLADR = CLADI/2
CLADR = CLADI/4
CLADR = CLADI/8
CLADR = CLADI/16
CLADR = CLADI/32
CLADR = CLADI/64
CLADR = CLADI/128
001
010
4
011
8
100
16
32
64
128
101
110
111
VSCALE[2:0]
CLAD Variable Scale Factor—Divides CLADV signal by 2[VSCALE] before use in the
CPHASE detector. Applicable only if CEN [addr 090] is active. Allows the system to select
CLADV frequency that is up to 128 times CLADR.
VSCALE
000
Scale Factor
CPHASE Variable Input
CLADV selected by VSEL [addr 091]
1
2
CLADV/2
CLADV/4
001
010
4
CLADV/8
011
8
CLADV/16
CLADV/32
CLADV/64
CLADV/128
100
16
32
64
128
101
110
111
N8370DSE
Conexant
3-85
CONEXANT [ CONEXANT SYSTEMS, INC ]
