AM1806_1005 Datasheet, PDF (19/241 Pages) Texas Instruments – AM1806 ARM Microprocessor

AM1806
www.ti.com
SPRS658B – FEBRUARY 2010 – REVISED MAY 2010
3.7 Terminal Functions
Table 3-3 to Table 3-27 identify the external signal names, the associated pin/ball numbers along with the
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
Table 3-3. Reset and JTAG Terminal Functions
SIGNAL
NAME
TYPE ⁽¹⁾
NO.
PULL ⁽²⁾
POWER
GROUP ⁽³⁾
DESCRIPTION
RESET
RESET
K14
I
IPU
B
Device reset input
RESETOUT / UHPI_HAS / PRU1_R30[14] /
GP6[15]
T17
O ⁽⁴⁾
CP[21]
C
Reset output
JTAG
TMS
L16
I
IPU
B
JTAG test mode select
TDI
M16
I
IPU
B
JTAG test data input
TDO
J18
O
IPU
B
JTAG test data output
TCK
J15
I
IPU
B
JTAG test clock
TRST
L17
I
IPD
B
JTAG test reset
EMU0
J16
I/O
IPU
B
Emulation pin
EMU1
RTCK/ GP8[0] ⁽⁵⁾
K16 I/O
IPU
K17 I/O
IPD
B
Emulation pin
B
JTAG Test Clock Return Clock Output
(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.
(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.
Copyright © 2010, Texas Instruments Incorporated
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