參數(shù)資料
型號(hào)： GS9075A
廠商： Gennum Corporation
英文描述： GS1575A / GS9075A HD-LINX-R II Multi-Rate SDI Automatic Reclocker
中文描述： GS1575A / GS9075A的HD - LINX進(jìn)程- R的第二多速率SDI自動(dòng)時(shí)鐘恢復(fù)器
文件頁(yè)數(shù)： 21/29頁(yè)
文件大?。?/td> 403K
代理商： GS9075A
GS1575A / GS9075A Data Sheet
34716 - 0
December 2005
21 of 29
In Manual mode, the SS[2:0] pins become inputs and the data rate can be
programmed by the application layer. In this mode, the search algorithm is disabled
and the PLL will only lock to the data rate selected.
Table 4-2
shows the SS[2:0] pin settings for either the data rate selected (in
Manual mode) or the data rate that the PLL has locked to (in Auto mode).
4.8 Bypass Mode
In Bypass mode, the GS1575A/9075A passes the data at the inputs directly to the
outputs. There are two pins that control the bypass function: BYPASS and
AUTOBYPASS.
When BYPASS is set HIGH by the application layer, the GS1575A/9075A will be
in Bypass mode.
When AUTOBYPASS is set HIGH by the application layer, the GS1575A/9075A
will be configured to enter Bypass mode only when the PLL has not locked to a data
rate. When BYPASS is set HIGH, AUTOBYPASS will be ignored.
When the PLL is not locked, and both BYPASS and AUTOBYPASS are set LOW,
the serial digital output DDO/DDO will produce invalid data.
4.9 DVB-ASI Operation
The GS1575A/9075A will also re-clock DVB-ASI at 270 Mb/s. When reclocking
DVB-ASI data set the ASI/177 pin HIGH to prevent a false lock to 177Mb/s. If
ASI/177 is not set HIGH, a false lock may occur since there is a harmonic present
in idle patterns (K28.5) which is very close the 177 Mb/s data rate (EIC 1179). Note
that setting the ASI/177 pin HIGH will disable the 177 Mb/s search when the device
is in Auto mode, consequently the GS1575A/9075A will not lock to that data rate.
Table 4-2: Data Rate Indication/Selection Bit Pattern
SS[2:0]
Data Rate (Mb/s)
000
143
001
177
010
270
011
360
100
540
101*
1485/1483.5
* This setting only applies to the GS1575A. For the GS9075A, when AUTO/MAN is LOW, the pin
settings SS[0:2] = 101 will be ignored by the device.
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