Texas Instruments Delfino TMS320F28374S, Manual

Page: 41 / 198

ADV
ANCEINFORMA
TION
TMS320F28377S, TMS320F28376S, TMS320F28375S, TMS320F28374S
www.ti.com SPRS881A – AUGUST 2014 – REVISED JUNE 2015
Table 4-1. Signal Descriptions (continued)
TERMINAL
ZWT PTP PZP
I/O/Z
(1)
DESCRIPTION
MUX
NAME BALL PIN PIN
POSITION
NO. NO. NO.
SPECIAL FUNCTIONS
ERRORSTS U19 92 – O Error status output. This pin has pulldown.
TEST PINS
Flash test pin 1. Reserved for TI. Must be left
FLT1 W12 73 42 I/O
unconnected.
Flash test pin 2. Reserved for TI. Must be left
FLT2 V13 74 43 I/O
unconnected.
(1) I = Input, O = Output, OD = Open Drain, Z = High Impedance
(2) The maximum toggling frequency of the GPIOs is 50 MHz.
(3) High-Speed SPI-enabled GPIO mux option. This pin mux option is required when using the SPI in High-Speed Mode (HS_MODE = 1 in
SPICCR). This mux option is still available when not using the SPI in High-Speed Mode (HS_MODE = 0 in SPICCR).
(4) This pin has output impedance that can be as low as 22 Ω . This output could have fast edges and ringing depending on the system
PCB characteristics. If this is a concern, the user should take precautions such as adding a 39 Ω (10% tolerance) series termination
resistor or implement some other termination scheme. It is also recommended that a system-level signal integrity analysis be performed
with the provided IBIS models. The termination is not required if this pin is used for input function.
4.3 Pins With Internal Pullup and Pulldown
Some pins on the device have internal pullups or pulldowns. Table 4-2 lists the pull direction and when it
is active. The pullups on GPIO pins are disabled by default and can be enabled through software. In order
to avoid any floating unbonded inputs, the Boot ROM will enable internal pullups on GPIO pins that are
not bonded out in a particular package. Other pins noted in
Table 4-2 with pullups and pulldowns are
always on and cannot be disabled.
Table 4-2. Pins With Internal Pullup and Pulldown
RESET APPLICATION
PIN POWER UP
(1)
DEVICE BOOT
(XRS = 0) SOFTWARE
GPIOx Pullup disabled Pullup disabled
(2)
Application-defined
TRST Pulldown active
TCK Pullup active
TMS Pullup active
TDI Pullup active
XRS Undefined Pullup active
VREGENZ Undefined Pulldown active
ERRORSTS Pulldown active
Other pins No pullup or pulldown present
(1) Before V
DD
and V
DDIO
reach recommended operating conditions.
(2) Pins not bonded out in a given package will have the internal pullups enabled by the Boot ROM.
Copyright © 2014–2015, Texas Instruments Incorporated
Terminal Configuration and Functions 41
Submit Documentation Feedback
Product Folder Links: TMS320F28377S TMS320F28376S TMS320F28375S TMS320F28374S