參數(shù)資料
型號(hào)： KS8701
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： FLEXTM Roaming Decoder II
中文描述： FLEXTM漫游解碼器二
文件頁數(shù)： 67/73頁
文件大?。?/td> 434K
代理商： KS8701
Appendix A: Application Notes
KS8701
66
FLEX
TM
Roaming Decoder II
USING THE RECEIVER SHUTDOWN PACKET
CALCULATING TIME LEFT
The receiver shutdown packet gives timing information to the host. Two times are of particular interest when
implementing a roaming algorithm.
l
Time To Warm Up Start. Defined as the amount of time there is before the receiver will start to warm up
(i.e. transition from the off state to the first warm up state).
l
Time To Tasks Disabled. Defined as the amount of time the host has to complete any host initiated tasks
(e.g. by setting
SND
or
SAS
in the roaming control packet).
The formula’s for calculating these times depend on whether the KS8701 is in synchronous mode or
asynchronous mode.
SYNCHRONOUS MODE:
Time To Warm Up Start
ˉ
(TNF 80ms) + (Skipped Frames 1874.375ms) + Receiver Off Time
-
167.5ms
Time To Tasks Disabled
ˉ
(TNF 80ms) + (Skipped Frames 1874.375ms)
-
247.5ms
ASYNCHRONOUS MODE:
Time To Warm Up Start
ˉ
((TNF - 2) 80ms) + Receiver Off Time
Time To Tasks Disabled
ˉ
((TNF - 3) 80ms)
Where,
TNF
: Time to Next Frame. Value from the receiver shutdown packet.
Skipped Frames
: The number of frames that won’t be decoded. This can be calculated from the
Current Frame (
CF
) and Next Needed Frame (
NAF
) fields in the receiver shutdown
packet (e.g. If
CF
is 10 and
NAF
is 12, then
Skipped Frames
is 1)
Receiver Off Time
: The time programmed in the receiver off setting packet.
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