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USB5744
DS00001855E-page 10
2015-2017 Microchip Technology Inc.
3.2
Pin Descriptions
This section contains descriptions of the various USB5744 pins. This pin descriptions have been broken into functional
groups as follows:
•
USB 3.1 Gen 1 Pin Descriptions
•
•
USB Port Control Pin Descriptions
•
•
Miscellaneous Pin Descriptions
•
Power and Ground Pin Descriptions
The “
_N
” symbol in the signal name indicates that the active, or asserted, state occurs when the signal is at a low voltage
level. For example,
RESET_N
indicates that the reset signal is active low. When “
_N
” is not present after the signal
name, the signal is asserted when at the high voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working with a mixture of
“active low” and “Active high” signals. The term assert, or assertion, indicates that a signal is active, independent of
whether that level is represented by a high or low voltage. The term negate, or negation, indicates that a signal is inac-
tive.
Note:
The buffer type for each signal is indicated in the “Buffer Type” column of the pin description tables. A
description of the buffer types is provided in
Section 3.3, "Buffer Types," on page 14
For additional information on configuration straps and configurable pins, refer to
Straps and Programmable Functions"
.
TABLE 3-2:
USB 3.1 GEN 1 PIN DESCRIPTIONS
Num
Pins
Symbol
Buffer
Type
Description
1
USB3UP_TXDP
IO-U
USB 3.1 Gen 1 upstream SuperSpeed transmit data plus.
1
USB3UP_TXDM
IO-U
USB 3.1 Gen 1 upstream SuperSpeed transmit data minus.
1
USB3UP_RXDP
IO-U
USB 3.1 Gen 1 upstream SuperSpeed receive data plus.
1
USB3UP_RXDM
IO-U
USB 3.1 Gen 1 upstream SuperSpeed receive data minus.
4
USBDN_TXDP[4:1]
IO-U
USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed transmit data plus.
4
USBDN_TXDM[4:1]
IO-U
USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed transmit data
minus.
4
USBDN_RXDP[4:1]
IO-U
USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed receive data plus.
4
USBDN_RXDM[4:1]
IO-U
USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed receive data
minus.
TABLE 3-3:
USB 2.0 PIN DESCRIPTIONS
Num
Pins
Symbol
Buffer
Type
Description
1
USB2UP_DP
IO-U
USB 2.0 upstream data plus (D+).
1
USB2UP_DM
IO-U
USB 2.0 upstream data minus (D-).