DS3170 Maxim Integrated Products, DS3170 Datasheet - Page 128

• Manufacturer Part Number: DS3170
• Description: Network Controller & Processor ICs DS3-E3 Single-Chip T ransceiver T3-E3 Fra
• Manufacturer: Maxim Integrated Products

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Bits 11 to 10: Global 8KHz Reference Source [1:0] (G8KRS[1:0]). These bits determine the source for the
internally generated 8 kHz reference as well as the internal one second reference, which is derived from the Global
8 kHz reference. The source is selected from the CLAD clock or from the port 8KREF clock source. See
10-12. Global 8 kHz Reference Source Table
These bits are ignored when the G8KIS bit = 1.
Table 10-12. Global 8 kHz Reference Source Table
Bit 9: Global 8KHz Reference Output Select (G8KOS). This bit determines whether GPIO2 pin is used for the
global 8KREFO output signal, or is used as specified by GL.GIOCR.GPIO2S[1:0].
Bit 8: Global 8KHz Reference Input Select (G8KIS). This bit determines whether GPIO4 pin is used for the global
8KREFI input signal, or is used as specified by GL.GIOCR.GPIO4S[1:0]. G8KREFI signal will be low if not
selected. Global 8KREF pin signal will be low if not selected.
Bits 3 to 1: CLAD IO Mode [2:0] (CLAD[2:0]). These bits control the CLAD. See
Table 10-11. CLAD Clock Source Settings
GL.CR2.
G8KIS
CLAD[2:0]
0
0
0
0
1
11X
000
001
010
011
100
101
0 = GPIO2 pin mode selected by
1 = GPIO2 is the global 8KREFO output signal selected by
0 = GPIO4 pin mode selected by
1 = GPIO4 is the global 8KREFI input signal for one second timer and port to use
G8KRS[1:0]
GL.CR2.
15
--
--
0
7
0
XX
00
01
10
11
REFCLK (INPUT)
44.736 MHz
34.368 MHz
51.84 MHz
19.44 MHz
Undefined
Undefined
77.76 MHz
None, the 8KHZ divider is disabled.
Derived from CLAD output clock
8KREF source selected by P8KRS[1:0]
Undefined
GPIO4
14
--
--
0
6
0
GL.CR2
Global Control Register 2
004h
13
GL.GIOCR.
GL.GIOCR.
--
0
5
--
0
SOURCE
128 of 230
GPIO2S[1:0]
GPIO4S[1:0]
12
--
--
0
4
0
G8KRS1
CLAD2
GL.CR2.8KRS[2:0]
11
0
3
0
DS3170 DS3/E3 Single-Chip Transceiver
G8KRS0
CLAD1
10
0
2
0
Table
10-11.
G8K0S
CLAD0
9
0
1
0
G8KIS
--
8
0
0
0
Table