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GS3471 데이터시트(PDF) 23 Page - Semtech Corporation

부품명 GS3471
상세설명  3G, HD, SD SDI Receiver, with Integrated Adaptive Cable Equalizer
PDF  179 Pages
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제조업체  SEMTECH [Semtech Corporation]
홈페이지  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS3471 데이터시트(HTML) 23 Page - Semtech Corporation

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GS3471
Final Data Sheet Rev.4
PDS-060498
September 2017
23 of 179
Semtech
www.semtech.com
4.2 Device Power-Up
The GS3471 is designed to operate in a multi-voltage environment which allows any
power-up sequence to be used. Supply pins can all be powered up in any order.
4.2.1 Power-Down Mode
The PWR_DWN pin reduces power to a minimum by disabling various device features.
When the PWR_DWN pin is de-asserted, the device returns to its previous operating
condition within 1 second, without requiring input from the host interface. There are
several power-down options which can be configured through GSPI prior to the device
going into power-down. Table 4-1 provides a summary of the supported power-down
options by accessing the POWER_DOWN register.
When the equalized input is not in use, it can be powered down using SLEEP.
Additionally, the equalized input can be placed in an automatic sleep mode, whereby it
is automatically powered down when no carrier is present and automatically powered
up when carrier is present. This mode is selected using SLEEP.
Table 4-1: Power-down Mode
Power-down Mode
CSR
Access
DDO
Loop-through
Mode
PCLK Mode
Power-down
PD_PCLK_ENABLE = 0
SERIAL_LOOPBACK_EN = 0
PD_CSR_ACCESS = 0
RC_BYP = X
No
DDO Disabled
PCLK
Disabled
Power-down with CSR Access
PD_PCLK_ENABLE = 0
SERIAL_LOOPBACK_EN = 0
PD_CSR_ACCESS = 1
RC_BYP = X
Yes
DDO Disabled
PCLK
Disabled
Power-down with PCLK
PD_PCLK_ENABLE = 1
SERIAL_LOOPBACK_EN = 0
PD_CSR_ACCESS = X
RC_BYP = X
Yes
DDO Disabled
PCLK Enabled
Power-down with DDO
PD_PCLK_ENABLE = 0
SERIAL_LOOPBACK_EN = 1
PD_CSR_ACCESS = X
RC_BYP = 1
No
DDO Enabled
Non-retimed
PCLK
Disabled



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