GS2962 Datasheet, PDF (61/82 Pages) Gennum Corporation – Integrated Narrow-Bandwidth PLL

Table 4-12: GS2962 PLL Bandwidth (Continued)
Mode
HD
HD
3G
PCLK Frequency
(MHz)
74.25
148.50
148.50
Filter Resistor
(Ω)
200
200
200
Charge Pump
Current (μA)
100
100
100
Bandwidth
(kHz)
26.32
52.63
52.63
4.10.2 Lock Detect
The Lock Detect block controls the serial digital output signal and indicates to the
application layer the lock status of the device.
The LOCKED output pin is provided to indicate the device operating status.
The LOCKED output signal is set HIGH by the lock detect block under the following
conditions (see Table 4-13):
Table 4-13: GS2962 Lock Detect Indication
RESET
HIGH
HIGH
HIGH
PLL Lock
HIGH
HIGH
HIGH
SMPTE_BYPASS
HIGH
LOW
LOW
DVB_ASI
LOW
HIGH
LOW
RATE_SEL0
X
HIGH
X
Any other combination of signal states not included in the above table results in the
LOCKED pin being LOW.
NOTE: When the LOCKED pin is LOW, the serial digital output is in the muted state.
4.11 GSPI Host Interface
The GSPI, or Gennum Serial Peripheral Interface, is a 4-wire interface provided to allow
the application layer to access additional status information through configuration
registers in the GS2962.
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).
Because these pins can be shared with the JTAG interface port for compatibility with the
GS1582, 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 are provided by the
application interface. 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. The interface is illustrated in Figure 4-21 below.
GS2962 3G/HD/SD-SDI Serializer with Complete
SMPTE Video Support
Data Sheet
48005 - 7
October 2010
61 of 82