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GS2970A Datasheet(PDF) 95 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 95 Page - Semtech Corporation |
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95 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 95 of 150 4.20 GSPI - HOST Interface The GSPI, or Gennum Serial Peripheral Interface, is a 4-wire interface provided to allow the system to access additional status and control information through configuration registers in the GS2970A. The GSPI is comprised of a Serial Data Input signal (SDIN), Serial Data Output signal (SDOUT), an active low Chip Select (CS), and a Burst Clock (SCLK). 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 JTAG/HOST is HIGH, the JTAG interface is enabled. When operating in GSPI mode, the SCLK, SDIN, and CS signals must be provided by the system. The SDOUT pin is a non-clocked loop-through of SDIN and may be connected to the SDIN of another device, allowing multiple devices to be connected to the GSPI chain. See Section 4.20.2 for details. The interface is illustrated in the Figure 4-47 below. Figure 4-47:GSPI Application Interface Connection All read or write access to the GS2970A is initiated and terminated by the system host processor. Each access always begins with a Command/Address Word, followed by a data write to, or data read from, the GS2970A. 4.20.1 Command Word Description The Command Word consists of a 16-bit word transmitted MSB first and contains a read/write bit, an Auto-Increment bit and a 12-bit address. Figure 4-48:Command Word Format Application Host SCLK SCLK SCLK CS1 SDOUT SDIN SDOUT SDOUT CS SDIN SDIN CS2 GS2970A GS2970A CS R/W RSV RSV AutoInc A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A11 A10 MSB LSB |
Similar Part No. - GS2970A |
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Similar Description - GS2970A |
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