DS3170 Maxim Integrated Products, DS3170 Datasheet - Page 68

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

10.4.4 General-Purpose IO Pins
There are eight general-purpose IO pins that can be used for general IO, global signals and framer alarm signals.
Each pin is independently configurable to be a general-purpose input, general-purpose output, global signal or
framer alarm. Two of the GPIO pins can be programmed to output one or two framer alarm statuses. One of the
two pins assigned to framer alarms can be programmed as global input or output signals. When the port is
powered down or reset and GL.GIOCR.GPIOx[1:0] = 01, the GPIO pin will be an output driving low. The 8KREFI,
TMEI, and PMU signals that can be sourced by the GPIO pin will be driven low into the core logic when the GPIO
pin is not selected for the source of the signal.
Table 10-14
Table 10-14. GPIO Global Signals
Table 10-15
Table 10-15. GPIO Pin Global Mode Select Bits
x = A or B, valid when a GPIO pin is not selected for a global signal
Table 10-16
located in the
GPIO2
GPIO4
GPIO6
GPIO8
GL.GIOCR.GPIOSx
PIN
00
01
10
11
8KREFO output
8KREFI input
TMEI input
PMU input
GLOBAL SIGNAL
lists the purpose and control thereof of the General-Purpose IO Pins.
describes the selection of mode for the GPIO Pins.
lists the various port alarm monitors that can be output on the GPIO pins. The GPIO(A/B)[3:0] bits are
PORT.CR4
Input
Framer alarm status selected
by port GPIO
Output logic 0
Output logic 1
Register.
GPIO PIN MODE
GL.CR2.G8KOS
GL.CR2.G8KIS
GL.CR1.MEIMS
GL.CR1.GPM[1:0]
CONTROL BIT
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DS3170 DS3/E3 Single-Chip Transceiver