GS9060 Data Sheet
3.11.5 Parallel Output Clock (PCLK)
The frequency of the PCLK output signal of the GS9060 is determined by the
output data format. Table 3-15 below lists the possible output signal formats and
their corresponding parallel clock rates. Note that DVB-ASI output will always be in
10-bit format, regardless of the setting of the 20bit/10bit pin.
Table 3-15: Parallel Data Output Format
Output Data Format
DOUT
[19:10]
DOUT
[9:0]
PCLK
Input Control Signals
20bit/10bit
SMPTE_BYPASS
DVB_ASI
SMPTE Mode
20bit DEMULTIPLEXED
10bit MULTIPLEXED
LUMA
CHROMA
13.5MHz
27MHz
HIGH
LOW
HIGH
HIGH
LOW
LOW
LUMA / CHROMA
FORCED LOW
DVB-ASI Mode
10bit DVB-ASI
DVB-ASI DATA
DVB-ASI DATA
FORCED LOW
FORCED LOW
27MHz
27MHz
HIGH
LOW
LOW
LOW
HIGH
HIGH
Data-Through Mode
20bit DEMULTIPLEXED
10bit MULTIPLEXED
DATA
DATA
DATA
13.5MHz
27MHz
HIGH
LOW
LOW
LOW
LOW
LOW
FORCED LOW
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 device and /or to provide
additional status information through configuration registers in the GS9060.
The GSPI comprises a serial data input signal SDIN, 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 host interface. The SDOUT pin is a high-impedance output allowing multiple
devices to be connected in parallel and selected via the CS input. The interface is
illustrated in Figure 3-8.
All read or write access to the GS9060 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.
22208 - 8 January 2007
51 of 61
GENNUM [ GENNUM CORPORATION ]
