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GS2986 数据表(PDF) 8 Page - Gennum Corporation

部件名 GS2986
功能描述  Standards indication in Auto mode
Download  41 Pages
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制造商  GENNUM [Gennum Corporation]
网页  http://www.gennum.com
标志 GENNUM - Gennum Corporation

GS2986 数据表(HTML) 8 Page - Gennum Corporation

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GS2986 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52134 - 3
July 2012
8 of 41
1.3 Default Start-up Settings
The GS2986 has some functions that are not accessible via direct pin control, and are only
accessible through the host interface registers. These functions have an internal pull-up or
pull-down resistor that sets the default logic level or start-up state, if it is not already set by
a pin.
If the user wishes to override these logic levels, the associated bit should be programmed
within the PIN_OR_1 register (pin override register) at address 0x0C. The logic values
within the PIN_OR_1 register become active when the user sets the Pin Override Enable bit
to HIGH within that same register.
Table 1-2 shows:
1. The default logic state set by the internal pull-up or pull-down resistors.
2. The default values within the Pin Override register upon reset.
More details are given in Section 4.15.
Table 1-2: GS2986 Default Start-up Settings
Name
Description
Default State set by
Internal Resistors
Default State within
the Pin Override
Register
BYPASS
Bypasses the reclocker stage when set HIGH.
0
0
AUTOBYPASS
When set HIGH, this bit automatically bypasses the
reclocker stage when the PLL is not locked to a
supported rate.
00
AUTO/MAN
When set HIGH, the standard is automatically detected
from the input data rate.
10
SS0, SS1
When AUTO/MAN is set HIGH, SS[1:0] are outputs
displaying the data rate to which the PLL has locked.
Therefore, the bits will not have a default start-up
value.
None
0:0
KBB
Controls the loop bandwidth of the PLL.
Floating
Ground
DATA_MUTE
Mutes the DDO0/DDO0 and DDO1/DDO1 (if data is
selected) outputs when LOW.
10
DATA/CLOCK
HIGH = DATA
LOW = CLOCK
00
DE_EN
De-emphasis on/off pin for serial digital output.
HIGH = de-emphasis on
LOW = de-emphasis off
00


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