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參數資料
| 型號： | LC89058W-E |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, SQFP-48 |
| 文件頁數： | 18/46頁 |
| 文件大小： | 284K |
| 代理商： | LC89058W-E |
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LC89058W-E
No.A1056-25/64
10.1.9 Output of clock switch transition signal (CKST)
CKST outputs pulse when the output clock changes by PLL lock/unlock.
The polarity of the CKST pulse output can be reversed with CKSTP. Subsequently, CKSTP is assumed to be 0.
In the lock-in stage, the CKST falls at the word clock generated from the XIN clock after PLL is locked following
detection of input data, and rises at the same timing as RERR after a designated period.
In the unlock stage, the CKST falls at the same timing as RERR, PLL lock detection signal, and rises after word
clocks generated from the XIN clock are counted for a designated period.
Change of the PLL lock status and timing of the clock change can be seen by detecting the rising and falling edges
and pulses of CKST.
The clock is switched after the PLL lock condition is tested and identified. The timing of this clock switching is
determined by setting the PTOXW [1:0]. The initial value is such that the clock is switched in 2.7ms after the falling
edge of CKST. The value, however, assumes that the oscillation amplifier is set to permanent operation mode. If the
oscillation amplifier is set to be stopped after PLL locking, the startup time before the oscillation amplifier stabilizes
after PLL unlocking, is added.
A free-running clock is output from the clock output pin immediately after PLL unlocking.
Figure 10.5 Clock Switch Timing
Digital data
LOCK
UNLOCK
5.3ms
Same timing as RERR
RX0 to RX6
PLL status
XIN clock
PLL clock
CKST
RERR
RMCK
(b): Unlock stage
(CKSTP=0)
RX0 to RX6
PLL status
XIN clock
PLL clock
CKST
RERR
RMCK
(a): Lock-in stage
Digital data
UNLOCK
LOCK
After PLL lock
3ms to 144ms
(CKSTP=0)
XIN clock
PLL clock
XIN clock
2.7ms
2.7ms**
**: When set to PTOXW[1:0]=00 (max.)
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