GS2971A Datasheet, PDF (144/152 Pages) Gennum Corporation – Integrated audio clock generator

accomplished with tri-state buffers used in conjunction with the JTAG/HOST input
signal. This is shown in Figure 4-54.
Application HOST
GS2971A
CS_TMS
SCLK_TCK
SDIN_TDI
SDOUT_TDO
JTAG_HOST
Figure 4-54:In-Circuit JTAG
In-circuit ATE probe
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 4-55.
Application HOST
GS2971A
CS_TMS
SCLK_TCK
SDIN_TDI
SDOUT_TDO
Tri-State
In-circuit ATE probe
JTAG_HOST
Figure 4-55:System JTAG
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 GS2971A.
GS2971A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54311 - 2
September 2012
144 of 152