參數(shù)資料
型號： IDT82V3288
廠商： Integrated Device Technology, Inc.
英文描述： WAN PLL
中文描述： 廣域網(wǎng)鎖相環(huán)
文件頁數(shù)： 21/170頁
文件大小： 1053K
代理商： IDT82V3288
IDT82V3288
WAN PLL
Functional Description
21
June 22, 2006
3.3
INPUT CLOCKS & FRAME SYNC SIGNALS
Altogether 14 clocks and 3 frame sync signals are input to the
device.
3.3.1
INPUT CLOCKS
The device provides 14 input clock ports.
According to the input port technology, the input ports support the fol-
lowing technologies:
AMI
PECL/LVDS
CMOS
According to the input clock source, the following clock sources are
supported:
T1: Recovered clock from STM-N or OC-n
T2: PDH network synchronization timing
T3: External synchronization reference timing
IN1 and IN2 support the AMI input signal only and the clock source is
from T3. The input clock is a 64 kHz + 8 kHz or 64 kHz + 8 kHz + 0.4
kHz composite clock. The 400HZ_SEL bit should be set to match the
input frequency. Any input violation that does not meet the standard
composite clock structure will induce an AMI violation. The AMI violation
is indicated by the AMI1_VIOL
1
/ AMI2_VIOL
1
bit. If the AMI1_VIOL
2
/
AMI2_VIOL
2
bit is ‘1’, the occurrence of an AMI violation will trigger an
interrupt.
IN3, IN4 and IN7 ~ IN14 support CMOS input signal only and the
clock sources can be from T1, T2 or T3.
IN5 and IN6 support PECL/LVDS input signal only and automatically
detect whether the signal is PECL or LVDS. The clock sources can be
from T1, T2 or T3.
For SDH and SONET networks, the default frequency is different.
SONET / SDH frequency selection is controlled by the IN_SONET_SDH
bit. During reset, the default value of the IN_SONET_SDH bit is deter-
mined by the SONET/
SDH
pin: high for SONET and low for SDH. After
reset, the input signal on the SONET/
SDH
pin takes no effect.
3.3.2
FRAME SYNC INPUT SIGNALS
Three 2 kHz, 4 kHz or 8 kHz frame sync signals are input on the
EX_SYNC1 to EX_SYNC3 pins respectively. They are CMOS inputs.
The input frequency should match the setting in the SYNC_FREQ[1:0]
bits.
Only one of the three frame sync input signals is used for frame sync
output signal synchronization. Refer to
Chapter 3.13.2 Frame SYNC
Output Signals
for details.
Table 3: Related Bit / Register in Chapter 3.3
Bit
Register
Address (Hex)
400HZ_SEL
IN1_CNFG
IN2_CNFG
14
15
AMI1_VIOL
1
AMI2_VIOL
1
AMI1_VIOL
2
AMI2_VIOL
2
IN_SONET_SDH
SYNC_FREQ[1:0]
INTERRUPT3_STS
0F
INTERRUPTS3_ENABLE_CNFG
12
INPUT_MODE_CNFG
09
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