BU7964GUW_1 Datasheet, PDF (8/19 Pages) Rohm – Data rate 1350Mbps RGB Interface

BU7964GUW
Technical Note
●Power Modes
BU7964UW has three power modes.
1) Shutdown Mode
BU7964GUW goes to Shutdown Mode when XSD = ‘L.’ AII logic circuits are
initialized in the Shutdown Mode. All high-speed signaling are pulled down to
MSGND. All parallel data interface output ‘L’.
2) Standby Mode
BU7964GUW goes to a Standby Mode when XSD = ‘H’ and CLK+ / CLK− is Hi-Z. All high-speed signaling inputs sink
DC current in order to pull the pins down to MSGND. BU7964GUW is monitoring V_CM of CLK+ / CLK−. When TX device
starts driving high-speed signaling outputs, BU7964GUW detects its V_CM and switches to Active Mode. In Standby Mode,
All parallel data interface output ‘L’.
3) Active Mode
BU7964UW goes to Active Mode when XSD = ‘H’ and VCM is running.
Power Mode
XSD
Input
Vcm of
CLK+/CLK-
Table 9. Power Modes
Operation
Functions
MSDL3 Terminals
Parallel output
Shutdown
‘L’
MSGND
Initialized
Disabled(Pull-down)
Initial value
Standby
Active
‘H’
MSGND
MSDL3 Vcm detection
‘H’
Clock input is
active
MSDL3 V_CM monitor.
Normal operation.
(S2P conv)
MSDL3 Vcm
detection
(Pull-down)
MSDL3 V_CM monitor.
Enabled.
Initial value
Normal operation
4) Power Modes Transition
Fig.5.shows the Transition of power modes.
XSD = ”L”
Shutdown
XSD = ”H”
Standby
PCLK input
disabled (Hi-z)
PCLK input
detected
Active
Fig.5. Power Modes Transition
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
8/18
2010.04 - Rev.A