GS1572 A Guide to Designing with the GS1572
(EB1572)
Reference Design
46282 - 1
November 2009
10 of 18
Proprietary & Confidential
Figure 3-4: SMPTE and DVB_ASI Jumpers on the GS1572
3.5 External Control Interface
The GS1572 contains a set of internal status and configuration registers. These registers
are available to the host via the GS1572’s GSPI pins. Access to the applicable pins on the
GS1572 is provided using the JTAG/HOST interface section of the GS1572 (see
The JTAG/HOST interface section of the GS1572 can also be used for JTAG test
operation. The JTAG/HOST switch is used to toggle between the JTAG and GSPI
interface.
NOTE: For more information on the GS1572’s internal registers, the GSPI, or JTAG test
operation, please see the GS1572 Data Sheet.
Figure 3-5: JTAG/HOST Interface Block
SMPTE and DVB_ASI jumper leads.
Install two jumpers HORIZONTALLY in SMPTE mode.
Install two jumpers VERTICALLY in DVB_ASI mode.
Table 3-1: Jumper Settings
Jumper
SMPTE Mode
DVB-ASI Mode
DATA-THROUGH Mode
DVB_ASI
LOW
HIGH
LOW
SD/HD
Set HIGH to transmit SD signals.
Set LOW to transmit HD signals.
HIGH
Set HIGH or LOW depending on
the data rate of the input signal.
SMPTE_BYPASS
HIGH
LOW
LOW
20bit/10bit
Set HIGH for 20-bit demultiplexed
input data.
Set LOW for 10-bit multiplexed
input data.
Switch setting ignored by device.
Input port of the GS1572 is
automatically configured for
10-bit operation.
Set HIGH for 20-bit demultiplexed
input data.
Set LOW for 10-bit multiplexed
input data.
JTAG/HOST INTERFACE
1
JTAG / HOST
INTERFACE ACCESS
DESCRIPTION OF
INTERFACE PINS
