GS2960 datasheet(73/97 Pages) SEMTECH

73 / 97 page

GS2960 3Gb/s, HD, SD SDI Receiver Complete with

SMPTE Video Processing

Data Sheet

48003 - 6

September 2012

73 of 97

conversion, it is recommended to reset the Level B to A converter with the following

sequence:

1. Assert the B to A converter reset by writing ‘1’ to bit 3 of register 05Eh.

2. Monitor H-pulse for a high-to-low transition.

3. De-assert the B to A converter reset by writing ‘0’ to bit 3 of register 05Eh. This must

be completed at the beginning of AV and should be completed in 1920 PCLK

periods.

4.19 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 GS2960.

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 4.19.2 for details. The interface is illustrated in the Figure 4-33 below.

Figure 4-33: GSPI Application Interface Connection

All read or write access to the GS2960 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 GS2960.

Application Host

SCLK

CS1

SDOUT

SDIN

SDOUT

SDIN

CS2

GS2960

GS2960 Datasheet(PDF) 73 Page - Semtech Corporation