Datasheet

38
TMS320F28379S , TMS320F28377S
TMS320F28376S, TMS320F28375S, TMS320F28374S
SPRS881C –AUGUST 2014–REVISED MAY 2016 www.ti.com
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Terminal Configuration and Functions Copyright © 2014–2016, Texas Instruments Incorporated
Table 4-1. Signal Descriptions (continued)
TERMINAL
I/O/Z
(1)
DESCRIPTION
NAME
MUX
POSITION
ZWT
BALL
NO.
PTP
PIN
NO.
PZP
PIN
NO.
SPECIAL FUNCTIONS
ERRORSTS U19 92 – O Error status output. This pin has an internal pulldown.
TEST PINS
FLT1 W12 73 42 I/O
Flash test pin 1. Reserved for TI. Must be left
unconnected.
FLT2 V13 74 43 I/O
Flash test pin 2. Reserved for TI. Must be left
unconnected.
(1) Pins not bonded out in a given package will have the internal pullups enabled by the Boot ROM.
(1) I = Input, O = Output, OD = Open Drain, Z = High Impedance
(2) 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).
(3) 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 39Ω (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
PIN
RESET
(XRS = 0)
DEVICE BOOT APPLICATION SOFTWARE
GPIOx Pullup disabled Pullup disabled
(1)
Pullup enable is application-
defined
TRST Pulldown active
TCK Pullup active
TMS Pullup active
TDI Pullup active
XRS Pullup active
VREGENZ Pulldown active
ERRORSTS Pulldown active
Other pins No pullup or pulldown present