参数资料
型号: IDT82V3280PF
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 通信及网络
英文描述: WAN PLL
中文描述: SPECIALTY TELECOM CIRCUIT, PQFP100
封装: TQFP-100
文件页数: 26/167页
文件大小: 1039K
代理商: IDT82V3280PF
IDT82V3280
WAN PLL
Functional Description
26
June 19, 2006
3.6.2
FORCED SELECTION
In Forced selection, the selected input clock is set by the
T0_INPUT_SEL[3:0] / T4_INPUT_SEL[3:0] bits. The results of input
clocks quality monitoring (refer to
Chapter 3.5 Input Clock Quality Moni-
toring
) do not affect the input clock selection.
3.6.3
AUTOMATIC SELECTION
In Automatic selection, the input clock selection is determined by its
validity, priority and locking allowance configuration. The validity
depends on the results of input clock quality monitoring (refer to
Chapter 3.5 Input Clock Quality Monitoring
). Locking allowance is con-
figured by the corresponding INn_VALID bit(14
n
1). Refer to
Figure 6
. In all the qualified input clocks, the one with the highest priority
is
selected.
The
priority
is
INn_SEL_PRIORITY[3:0] bits (14
n
1). If more than one qualified
input clock INn is available and has the same priority, the input clock
with the smallest ‘n’ is selected.
set
by
the
corresponding
Figure 6. Qualified Input Clocks for Automatic Selection
Table 9: Related Bit / Register in Chapter 3.6
Bit
Register
Address (Hex)
EXT_SW
MON_SW_PBO_CNFG
T0_INPUT_SEL_CNFG
0B
50
T0_INPUT_SEL[3:0]
T4_LOCK_T0
T0_FOR_T4
T4_INPUT_SEL[3:0]
T4_INPUT_SEL_CNFG
51
INn_SEL_PRIORITY[3:0] (14
n
1)
IN1_IN2_SEL_PRIORITY_CNFG ~
IN13_IN14_SEL_PRIORITY_CNFG
REMOTE_INPUT_VALID1_CNFG,
REMOTE_INPUT_VALID2_CNFG
INPUT_VALID1_STS, INPUT_VALID2_STS
T4_T0_REG_SEL_CNFG
26 ~ 2C *
INn_VALID (14
n
1)
4C, 4D
INn (14
n
1)
T4_T0_SEL
4A, 4B
07
Note: *
The setting in the 26 ~ 2C registers is either for T0 path or for T4 path, as determined by the T4_T0_SEL bit.
Validity
Priority
INn_SEL_PRIORITY[3:0]
'0000', (14 > n > 1)
Locking Allowance
INn_VALID = '0',
(14 > n > 1)
Yes
No
No
No
Yes
Yes
All qualified input clocks are available for Automatic selection
Input Clock Quality Monitoring
(LOS, Activity, Frequency)
INn = '1', (14 > n > 1)
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