參數(shù)資料
型號: GS4910B
廠商: Gennum Corporation
英文描述: HD/SD/Graphics Clock and Timing Generator with GENLOCK
中文描述: 高清/標清/圖形時鐘和定時發(fā)生器鎖相
文件頁數(shù): 76/113頁
文件大?。?/td> 1017K
代理商: GS4910B
GS4911B/GS4910B Data Sheet
36655 - 2
April 2006
76 of 113
3.12 GSPI Host Interface
The GSPI, or Gennum Serial Peripheral Interface, is a 4-wire interface provided to
allow the host to enable additional features of the GS4911B/GS4910B and/or to
provide additional status information through configuration registers in the device.
The GSPI comprises a serial data input signal, SDIN, a serial data output signal,
SDOUT, an active low chip select, CS, and a burst clock, SCLK. The burst clock
must have a duty cycle between 40% and 60%.
Because these pins are shared with the JTAG interface port, an additional control
signal pin, JTAG/HOST is provided. When JTAG/HOST is LOW, the GSPI
interface is enabled.
When operating in GSPI mode, the SCLK, SDIN, and CS signals are provided by
the application interface. The SDOUT pin is a non-clocked loop-through of SDIN
and may be connected to the SDIN pin of another device, allowing multiple devices
to be connected to the GSPI chain. The interface is illustrated in
Figure 3-14
.
Figure 3-14: GSPI Application Interface Connection
All read or write access to the GS4911B/GS4910B is initiated and terminated by
the host processor. Each access always begins with a 16-bit command word on
SDIN indicating the address of the register of interest. This is followed by a 16-bit
data word on SDIN in write mode, or a 16-bit data word on SDOUT in read mode.
Application Host
SCLK
SCLK
SCLK
CS1
SDOUT
SDIN
SDOUT
SDOUT
CS
SDIN
SDIN
CS2
GS4911B/GS4910B
CS
GS4911B/GS4910B
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