DS3105 datasheet(13/120 Pages) MAXIM

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_____________________________________________________________________________________________ DS3105

19-4628; Rev 3; 5/09

13 of 120

Table 6-3. Global Pin Descriptions

PIN NAME

(1)

TYPE

(2)

PIN DESCRIPTION

RST

IPU

Reset (Active Low). When this global asynchronous reset is pulled low, all internal circuitry is

reset to default values. The device is held in reset as long as

RST is low. RST should be held

low for at least two REFCLK cycles after the external oscillator has stabilized and is providing

valid clock signals.

SRCSW

IPD

Source Switching. Fast source-switching control input. See Section 7.6.5. The value of this pin

is latched into MCR10:EXTSW when

RST goes high. After RST goes high this pin can be used

to select between IC3/IC5 and IC4/IC6, if enabled.

TEST

IPD

Factory Test Mode Select. Wire this pin to VSS for normal operation.

O3F1/SRFAIL

IOPU

OC3 Frequency Select 1/SRFAIL Status Pin. This pin is sampled when the

RST pin goes high

and the value is used as O3F1, which, together with O3F2 and O3F0, sets the default

frequency of the OC3 output clock pin. See Table 7-18. After

RST goes high, if MCR10:SRFPIN

= 1, this pin follows the state of the SRFAIL status bit in the MSR2 register. This gives the

system a very fast indication of the failure of the current reference. When MCR10:SRFPIN = 0,

SRFAIL is disabled (low).

O3F2/LOCK

IOPD

OC3 Frequency Select 2/T0 DPLL LOCK Status. This pin is sampled when the

RST pin goes

high and the value is used as O3F2, which, together with O3F1 and O3F0, sets the default

frequency of the OC3 output clock pin. See Table 7-18. After

RST goes high, if

MCR1.LOCKPIN = 1, this pin indicates the lock state of the T0 DPLL. When MCR1.LOCKPIN =

0, LOCK is disabled (low).

0 = Not locked

1 = Locked

O6F0/GPIO1

IOPD

OC6 Frequency Select 0/General-Purpose I/O Pin 1. This pin is sampled when the

RST pin

goes high and the value is used as O6F0, which, together with O6F2 and O6F1, sets the

default frequency of the OC6 output clock pin. See Table 7-17. After

RST goes high, this pin

can be used as a general-purpose I/O pin. GPCR:GPIO1D configures this pin as an input or an

output. GPCR:GPIO1O specifies the output value. GPSR:GPIO1 indicates the state of the pin.

O6F1/GPIO2

IOPD

OC6 Frequency Select 1/General-Purpose I/O Pin 2. This pin is sampled when the

RST pin

goes high and the value is used as O6F1 which together with O6F2 and O6F0 sets the default

frequency of the OC6 output clock pin. See Table 7-17. After

RST goes high this pin can be

used as a general purpose I/O pin. GPCR:GPIO2D configures this pin as an input or an output.

GPCR:GPIO2O specifies the output value. GPSR:GPIO2 indicates the state of the pin.

O6F2 GPIO3

IOPU

OC6 Frequency Select 2/General-Purpose I/O Pin 3. This pin is sampled when the

RST pin

goes high and the value is used as O6F2, which, together with O6F1 and O6F0, sets the

default frequency of the OC6 output clock pin. See Table 7-17. After

RST goes high, this pin

can be used as a general-purpose I/O pin. GPCR:GPIO3D configures this pin as an input or an

output. GPCR:GPIO3O specifies the output value. GPSR:GPIO3 indicates the state of the pin.

SONSDH/

GPIO4

I/OPD

SONET/SDH Frequency Select Input/General-Purpose I/O 4. When

RST goes high the state

of this pin sets the reset-default state of MCR3:SONSDH, MCR6:DIG1SS, and MCR6:DIG2SS.

After

RST goes high this pin can be used as a general-purpose I/O pin. GPCR:GPIO4D

configures this pin as an input or an output. GPCR:GPIO4O specifies the output value.

GPSR:GPIO4 indicates the state of the pin.

Reset latched values:

0 = SDH rates (N x 2.048MHz)

1 = SONET rates (N x 1.544MHz)

INTREQ/LOS

Interrupt Request/Loss of Signal. Programmable (default: INTREQ). The INTCR:LOS bit

determines whether the pin indicates interrupt requests or loss of signal (i.e., loss of selected

reference).

INTCR:LOS = 0: INTREQ mode

The behavior of this pin is configured in the INTCR register. Polarity can be active high or

active low. Drive action can be push-pull or open drain. The pin can also be configured as

a general-purpose output if the interrupt request function is not needed.

INTCR:LOS = 1: LOS mode

This pin indicates the real-time state of the selected reference activity monitor (see Section

7.5.3). This function is most useful when external switching mode (Section 7.6.5) is

enabled (MCR10:EXTSW = 1).

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