DS3172 Maxim Integrated, DS3172 Datasheet - Page 129
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DS3172
Manufacturer Part Number
DS3172
Description
Network Controller & Processor ICs Dual DS3/E3 Single Chip Transceiver
Manufacturer
Maxim Integrated
Datasheet
1.DS3171.pdf
(234 pages)
Specifications of DS3172
Part # Aliases
90-31720-000
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Bit 0: Reset (RST). When this bit is set, all of the internal data path and status and control registers (except this
RST bit), on all of the ports, will be reset to their default state. This bit must be set high for a minimum of 100ns.
See the
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Bits 12 to 10: Global 8KHz Reference Source [2:0] (G8KRS[2:0]). 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 one of the CLAD clocks or from one of the port 8KREF clock sources.
These bits are ignored when the G8KIS bit = 1. See
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 0: CLAD IO Mode [3:0] (CLAD[3:0]). These bits control the CLAD clock IO pins CLKA, CLKB and CLKC.
Note: These bits control which clock is used to recover the RX Clock from the line in the LIU. See
0 = Normal operation
1 = Force all internal registers to their default values
0 = GPIO2 pin mode selected by GL.GIOCR.GPIO2S[1:0]
1 = GPIO2 is the global 8KREFO output signal selected by GL.CR2.8KRS[2:0]
0 = GPIO4 pin mode selected by GL.GIOCR.GPIO4S[1:0]
1 = GPIO4 is the global 8KREFI input signal for one second timer and ports to use
Reset and Power-Down
15
--
--
0
7
0
14
--
--
0
6
0
section in Section 10.3.
GL.CR2
Global Control Register 2
004h
13
--
--
0
5
0
G8KRS2
Table
12
--
0
4
0
129
10-12.
G8KRS1
CLAD3
11
0
3
0
G8KRS0
CLAD2
10
0
2
0
G8K0S
CLAD1
9
0
1
0
Table
CLAD0
10-11.
G8KIS
8
0
0
0
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