GS1671 datasheet(78/130 Pages) SEMTECH

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GS1671 HD/SD SDI Integrated Receiver

Data Sheet

53737 - 2

September 2012

78 of 130

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 GS1671.

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 4-38 below.

Figure 4-38: GSPI Application Interface Connection

All read or write access to the GS1671 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 GS1671.

4.19.1 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 4-39: Command Word Format

Command Words are clocked into the GS1671 on the rising edge of the Serial Clock

SCLK, which operates in a burst fashion. The chip select (CS) signal must be set low a

Application Host

SCLK

CS1

SDOUT

SDIN

SDOUT

SDIN

CS2

GS1671

R/W

RSV

AutoInc

A11

A10

MSB

LSB

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