Terminal Functions; Device Configuration - Texas Instruments AM1808 User Manual

AM1808
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
3.7

Terminal Functions

Table 3-3 to Table 3-29
mechanical package designator, the pin type (I, O, IO, OZ, or PWR), whether the pin/ball has any internal
pullup/pulldown resistors, whether the pin/ball is configurable as an IO in GPIO mode, and a functional pin
description.
3.7.1 Device Reset and JTAG
SIGNAL
NAME
RESET
RESETOUT / UHPI_HAS / PRU1_R30[14] /
GP6[15]
TMS
TDI
TDO
TCK
TRST
EMU0
EMU1
(5)
RTCK/ GP8[0]
(1) I = Input, O = Output, I/O = Bidirectional, Z = High impedance, PWR = Supply voltage, GND = Ground, A = Analog signal.
Note: For multiplexed pins where functions have different types (ie., input versus output), the table reflects the pin function direction for
that particular peripheral.
(2) IPD = Internal Pulldown resistor, IPU = Internal Pullup resistor. CP[n] = configurable pull-up/pull-down (where n is the pin group) using
the PUPDENA and PUPDSEL registers in the System Module. For more detailed information on pullup/pulldown resistors and situations
where external pullup/pulldown resistors are required, see the
internal pulldown circuits, see the
(3) This signal is part of a dual-voltage IO group (A, B or C). These groups can be operated at 3.3V or 1.8V nominal. The three groups can
be operated at independent voltages but all pins withina group will operate at the same voltage. Group A operates at the voltage of
power supply DVDD3318_A. Group B operates at the voltage of power supply DVDD3318_B. Group C operates at the voltage of power
supply DVDD3318_C.
(4) Open drain mode for RESETOUT function.
(5) GP8[0] is initially configured as a reserved function after reset and will not be in a predictable state. This signal will only be stable after
the GPIO configuration for this pin has been completed. Users should carefully consider the system implications of this pin being in an
unknown state after reset.
18 Device Overview
identify the external signal names, the associated pin/ball numbers along with the
Table 3-3. Reset and JTAG Terminal Functions
(1)
TYPE PULL
NO.
RESET
K14 I
(4)
T17 O CP[21]
JTAG
L16 I
M16 I
J18 O
J15 I
L17 I
J16 I/O
K16 I/O
K17 I/O

Device Configuration

Device Operating Conditions section.
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POWER
(2)
(3)
GROUP
IPU B Device reset input
C Reset output
IPU B JTAG test mode select
IPU B JTAG test data input
IPU B JTAG test data output
IPU B JTAG test clock
IPD B JTAG test reset
IPU B Emulation pin
IPU B Emulation pin
IPD B JTAG Test Clock Return Clock Output
section. For electrical specifications on pullup and
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