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| 型號(hào)： | GC3011-CQ |
| 文件頁數(shù)： | 27/34頁 |
| 文件大小： | 194K |
| 代理商： | GC3011-CQ |
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GRAYCHIP,INC.
- 27 -
JULY 22, 1996
GC3011 DIGITAL RESAMPLER
This document contains information which may be changed at any time without notice
4.9.3
READ PLL STATUS
If STATUS_SELECT is 2 the PLL status is read from addresses 14 and 15.
ADDRESS 14:
Status Register 0, STATUS_SELECT=2
BIT
TYPE
NAME
DESCRIPTION
0-3
4-7
R
R
LENGTH
[0:3]
DEPTH
[0:3]
The current VCO length setting.
The current VCO depth setting.
ADDRESS 15:
Status Register 1, STATUS_SELECT=2
BIT
TYPE
NAME
DESCRIPTION
0-3
R
STATE
[0:3]
The current PLL acquisition state. Zero is reset and
15 is acquired.
This bit is high when acquisition is in progress or
has not started. This bit is forced low if the
FORCE_LENGTH and FORCE_DIVIDE bits are
both high.
Indicates that the PLL is in a lock state.
Indicates the lock state. During acquisition the state
is zero. After acquisition 0 means the PLL is in lock.
One means that the FIFO is too full and the VCO
control voltage needs to be increased. Two means
that the FIFO is too empty and the VCO control
voltage needs to be decreased (slows the VCO).
4
R
BUSY
5
6,7
R
R
LOCK
LOCK_STATE[0:1]
4.9.4
READ CHECKSUM
If STATUS_SELECT is 3 the checksum is read from addresses 14 and the keepalive clock status
is read from 15. Address 15 is only used for test purposes.
ADDRESS 14:
Status Register 0, STATUS_SELECT=3
BIT
TYPE
NAME
DESCRIPTION
0-7
R
CHECKSUM
[0:7]
The checksum (See Section 2.10).
ADDRESS 15:
Status Register 1, STATUS_SELECT=3
BIT
TYPE
NAME
DESCRIPTION
0
1
2
3
4-7
R
R
R
R
R
KACK_IN
KA_IN
KACK_OUT
KA_OUT
unused
Input keepalive clock.
Input clock is in the keepalive mode.
Output keepalive clock
Output clock is in the keepalive mode.
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