IDT82V3285DQ IDT, Integrated Device Technology Inc, IDT82V3285DQ Datasheet - Page 22

• Manufacturer Part Number: IDT82V3285DQ
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT82V3285DQ

• Function: Wan PLL
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Package Type: TQFP
• Pin Count: 100
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

Table 5: Related Bit / Register in Chapter 3.5
3.5.2
ence clock. The reference clock can be derived from the master clock or
the output of T0 DPLL, as determined by the FREQ_MON_CLK bit.
the FREQ_MON_HARD_EN bit is ‘1’, a frequency hard alarm is raised
when the frequency of the input clock with respect to the reference clock
is above the threshold; the alarm is cleared when the frequency is below
the threshold.
status of the input clock is indicated by the INn_FREQ_HARD_ALARM
bit (1 ≤ n ≤ 5). When the FREQ_MON_HARD_EN bit is ‘0’, no frequency
hard alarm is raised even if the input clock is above the frequency hard
alarm threshold.
Functional Description
IDT82V3285
Frequency is monitored by comparing the input clock with a refer-
A frequency hard alarm threshold is set for frequency monitoring. If
The frequency hard alarm threshold can be calculated as follows:
If the FREQ_MON_HARD_EN bit is ‘1’, the frequency hard alarm
LOWER_THRESHOLD_n_DATA[7:0] (n = 3)
UPPER_THRESHOLD_n_DATA[7:0] (n = 3)
INn_NO_ACTIVITY_ALARM (
Frequency Hard Alarm Threshold (ppm) = (ALL_FREQ_HARD_
THRESHOLD[3:0] + 1) X FREQ_MON_FACTOR[3:0]
INn_FREQ_HARD_ALARM (
ALL_FREQ_HARD_THRESHOLD[3:0]
BUCKET_SIZE_n_DATA[7:0] (n = 3)
DECAY_RATE_n_DATA[1:0] (n = 3)
FREQUENCY MONITORING
FREQ_MON_FACTOR[3:0]
IN_FREQ_READ_CH[3:0]
FREQ_MON_HARD_EN
IN_FREQ_VALUE[7:0]
IN_NOISE_WINDOW
BUCKET_SEL[1:0]
FREQ_MON_CLK
Bit
1 ≤ n ≤ 5
1 ≤ n ≤ 5
)
)
ALL_FREQ_MON_THRESHOLD_CNFG
IN1_IN2_STS, IN3_IN4_STS, IN5_STS
LOWER_THRESHOLD_3_CNFG
UPPER_THRESHOLD_3_CNFG
22
FREQ_MON_FACTOR_CNFG
IN_FREQ_READ_CH_CNFG
PHASE_MON_PBO_CNFG
BUCKET_SIZE_3_CNFG
DECAY_RATE_3_CNFG
IN1_CNFG ~ IN5_CNFG
MON_SW_PBO_CNFG
selection for T0/T4 DPLL.
with respect to the reference clock are monitored. If any edge drifts out-
side ±5%, the input clock is disqualified for clock selection for T0/T4
DPLL. The input clock is qualified if any edge drifts inside ±5%. This
function is supported only when the IN_NOISE_WINDOW bit is ‘1’.
can be read by doing the following step by step:
depends on the application.
IN_FREQ_READ_STS
The input clock with a frequency hard alarm is disqualified for clock
In addition, if the input clock is 2 kHz, 4 kHz or 8 kHz, its clock edges
The frequency of each input clock with respect to the reference clock
Note that the value set by the FREQ_MON_FACTOR[3:0] bits
1. Select an input clock by setting the IN_FREQ_READ_CH[3:0]
2. Read the value in the IN_FREQ_VALUE[7:0] bits and calculate
Register
as follows:
bits;
Input Clock Frequency (ppm) = IN_FREQ_VALUE[7:0] X
FREQ_MON_FACTOR[3:0]
16 ~ 17, 19 ~ 1A, 1F
Address (Hex)
44~ 45, 48
April 11, 2007
3D
3E
0B
2F
2E
3F
40
78
41
42
WAN PLL