DS3105 Maxim Integrated Products, DS3105 Datasheet - Page 37

• Manufacturer Part Number: DS3105
• Description: Line Card Timing IC
• Manufacturer: Maxim Integrated Products

7.8.2.4
There are two sets of frequency select pins O3F[2:0] and O6F[2:0] that control the reset default frequencies of the
OC3 and OC6 output clock pins, respectively. The SONSDH pin also selects the output frequencies for some of the
pin settings. There is also an interaction between O3F[2:0] and O6F[2:0] when O6F[2:0] uses some internal
resource that is needed to generate certain frequencies. After reset the O3F[2:0] and O6F[2:0] pins can be used as
GPIO pins and status output pins. The default output frequencies are affected by changing the register bit values of
four registers: OCR2, OCR3, T0CR1, and T4CR1. The register defaults can be changed after reset using the
microprocessor interface.
Table 7-15 T0CR1.T0FREQ Default Settings
Table 7-16 T4CR1.T4FREQ Default Settings
Table 7-17 OC6 Default Frequency Configuration
* Occurs when O6F[2:0] are left floating.
Table 7-18 OC3 Default Frequency Configuration
* Occurs when O3F[2:0] are left floating.
O6F[2:0]
O6F[2:0]
O6F[2:0]
O3F[2:0]
!=001
!=001
=001
=001
100*
011*
000
001
010
011
101
110
111
000
001
001
001
010
010
100
101
110
111
Confidential. Document Issued Under Non-Disclosure Agreement. Confidential. Document Issued Under Non-Disclosure Agreement.
X
X
OC3 and OC6 Default Frequency Select Pins
SONSDH
SONSDH
O3F[2:0]
O3F[2:0]
!=001
!=010
=001
=010
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
0
1
0
1
0
1
Freq, MHz
Freq MHz
SONSDH
SONSDH
34.368
44.736
155.52
34.736
44.736
19.44
25.92
38.88
51.84
77.76
2.048
1.544
2.048
3.088
19.44
25.92
38.88
51.84
77.76
X
X
0
1
0
1
0
1
0
1
0
0
Preliminary. Subject to Change Without Notice.
OFREQ6
O6F[2:0]
FALSE
OCR3.
TRUE
0110
0111
0110
0111
0011
0101
0110
0111
1000
1001
1010
0011
=001
0000
1111
1110
010
100
001
001
X
X
X
X
X
X
X
X
T0CR1.T0FREQ
T4CR1.T4FREQ
OFREQ3
24 x DS1 DFB
37 of 110
12 x E1 DFB
OCR2.
APLL
0000
1101
1101
0111
0111
1111
1110
0110
0111
1000
1001
1010
77.76 AFB
77.76 AFB
SRC
16 x DS1
T4
T4
T0
T0
T0
T0
T0
T0
---
16 x E1
DS3
DS3
E3
E3
APLL
SRC
T4
T4
T0
T0
T4
T4
T0
T0
T0
T0
T0
---
DS3105