AM1808AZCED3 datasheet(19/264 Pages) TI

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AM1808

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SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010

3.7

Terminal Functions

Table 3-3 to Table 3-29 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

POWER

TYPE(1)

PULL(2)

DESCRIPTION

GROUP(3)

NAME

NO.

RESET

K14

IPU

Device reset input

RESETOUT / UHPI_HAS / PRU1_R30[14] /

T17

O(4)

CP[21]

Reset output

GP6[15]

JTAG

TMS

L16

IPU

JTAG test mode select

TDI

M16

IPU

JTAG test data input

TDO

J18

IPU

JTAG test data output

TCK

J15

IPU

JTAG test clock

TRST

L17

IPD

JTAG test reset

EMU0

J16

I/O

IPU

Emulation pin

EMU1

K16

I/O

IPU

Emulation pin

RTCK/ GP8[0] (5)

K17

I/O

IPD

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.

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