Cirrus Logic CS61880 - Manual (Page 21)

CS61880
DS450PP3 21
3.8 JTAG Test Interface
3.9 Miscellaneous
SYMBOL LQFP FBGA TYPE DESCRIPTION
TRST 95 G12 I
JTAG Reset
This active Low input resets the JTAG controller. This input
is pulled up internally and may be left as a NC when not
used.
TMS 96 F11 I
JTAG Test Mode Select Input
This input enables the JTAG serial port when active High.
This input is sampled on the rising edge of TCK. This input
is pulled up internally and may be left as a NC when not
used.
TCK 97 F14 I
JTAG Test Clock
Data on TDI is valid on the rising edge of TCK. Data on
TDO is valid on the falling edge of TCK. When TCK is
stopped high or low, the contents of all JTAG registers re-
main unchanged. Tie pin low through a 10 k
Ω
resistor when
not used.
TDO 98 F13 O
JTAG Test Data Output
JTAG test data is shifted out of the device on this pin. Data
is output on the falling edge of TCK. Leave as NC when not
used.
TDI 99 F12 I
JTAG Test Data Input
JTAG test data is shifted into the device using this pin. The
pin is sampled on the rising edge of TCK. TDI is pulled up
internally and may be left as a NC when not used.
SYMBOL LQFP FBGA TYPE DESCRIPTION
REF 94 H13 I Reference Input
This pin must be tied to ground through 13.3 k
Ω
1% resis-
tor. This pin is used to set the internal current level.