IDT82V3280
WAN PLL
Pin Description
13
June 19, 2006
2
PIN DESCRIPTION
Table 1: Pin Description
Name
Pin No.
I/O
Type
Description
1
Global Control Signal
OSCI
10
I
CMOS
OSCI: Crystal Oscillator Master Clock
A nominal 12.8000 MHz clock provided by a crystal oscillator is input on this pin. It is the
master clock for the device.
FF_SRCSW: External Fast Selection Enable
During reset, this pin determines the default value of the EXT_SW bit (b4, 0BH)
2
. The
EXT_SW bit determines whether the External Fast Selection is enabled.
High: The default value of the EXT_SW bit (b4, 0BH) is ‘1’ (External Fast selection is
enabled);
Low: The default value of the EXT_SW bit (b4, 0BH) is ‘0’ (External Fast selection is dis-
abled).
After reset, this pin selects an input clock pair for the T0 DPLL if the External Fast selection is
enabled:
High: Pair IN3 / IN5 is selected.
Low: Pair IN4 / IN6 is selected.
After reset, the input on this pin takes no effect if the External Fast selection is disabled.
FF_SRCSW
18
I
pull-down
CMOS
MS/
SL
99
I
pull-up
CMOS
MS/
SL
: Master / Slave Selection
This pin, together with the MS_SL_CTRL bit (b0, 13H), controls whether the device is config-
ured as the Master or as the Slave. Refer to
Chapter 3.14 Master / Slave Configuration
for
details.
The signal level on this pin is reflected by the MASTER_SLAVE bit (b1, 09H).
SONET/
SDH
100
I
pull-down
CMOS
SONET/
SDH
: SONET / SDH Frequency Selection
During reset, this pin determines the default value of the IN_SONET_SDH bit (b2, 09H):
High: The default value of the IN_SONET_SDH bit is ‘1’ (SONET);
Low: The default value of the IN_SONET_SDH bit is ‘0’ (SDH).
After reset, the value on this pin takes no effect.
RST
74
I
pull-up
CMOS
RST
: Reset
A low pulse of at least 50 μs on this pin resets the device. After this pin is high, the device will
still be held in reset state for 500 ms (typical).
Frame Synchronization Input Signal
EX_SYNC1
45
I
pull-down
CMOS
EX_SYNC1: External Sync Input 1
A 2 kHz, 4 kHz or 8 kHz signal is input on this pin.
Input Clock
IN1
24
I
AMI
IN1: Input Clock 1
A 64 kHz + 8 kHz or 64 kHz + 8 kHz + 0.4 kHz composite clock is input on this pin.
IN2: Input Clock 2
A 64 kHz + 8 kHz or 64 kHz + 8 kHz + 0.4 kHz composite clock is input on this pin.
IN3: Input Clock 3
A 2 kHz, 4 kHz, N x 8 kHz
3
, 1.544 MHz (SONET) / 2.048 MHz (SDH), 6.48 MHz, 19.44 MHz,
25.92 MHz, 38.88 MHz, 51.84 MHz, 77.76 MHz or 155.52 MHz clock is input on this pin.
IN4: Input Clock 4
A 2 kHz, 4 kHz, N x 8 kHz
3
, 1.544 MHz (SONET) / 2.048 MHz (SDH), 6.48 MHz, 19.44 MHz,
25.92 MHz, 38.88 MHz, 51.84 MHz, 77.76 MHz or 155.52 MHz clock is input on this pin.
IN5_POS / IN5_NEG: Positive / Negative Input Clock 5
A 2 kHz, 4 kHz, N x 8 kHz
3
, 1.544 MHz (SONET) / 2.048 MHz (SDH), 6.48 MHz, 19.44 MHz,
25.92 MHz, 38.88 MHz, 51.84 MHz, 77.76 MHz, 155.52 MHz, 311.04 MHz or 622.08 MHz
clock is differentially input on this pair of pins. Whether the clock signal is PECL or LVDS is
automatically detected.
IN2
25
I
AMI
IN3
46
I
pull-down
CMOS
IN4
47
I
pull-down
CMOS
IN5_POS
IN5_NEG
40
41
I
PECL/LVDS