GS2970 Datasheet, PDF (138/145 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

accomplished with tri-state buffers used in conjunction with the JTAG/HOST input
signal. This is shown in Figure 4-51.
Application HOST
GS2970
CS_TMS
SCLK_TCK
SDIN_TDI
SDOUT_TDO
JTAG_HOST
In-circuit ATE probe
Figure 4-51: In-Circuit JTAG
Alternatively, if the test capabilities are to be used in the system, the host processor may
still control the JTAG/HOST input signal, but some means for tri-stating the host must
exist in order to use the interface at ATE. This is represented in Figure 4-52.
Application HOST
GS2970
CS_TMS
SCLK_TCK
SDIN_TDI
Tri-State
In-circuit ATE probe
Figure 4-52: System JTAG
SDOUT_TDO
JTAG_HOST
Scan coverage is limited to digital pins only. There is no scan coverage for analog pins
VCO, SDO/SDO, RSET, LF, and CP_RES.
The JTAG/HOST pin must be held LOW during scan and therefore has no scan coverage.
Please contact your Semtech representative to obtain the BSDL model for the GS2970.
GS2970 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Audio and Video Processing
Data Sheet
47478 - 4
September 2012
138 of 145