AM652X datasheet(118/277 Pages) TI1

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118

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Terminal Configuration and Functions

Table 4-76. Unused Balls Specific Connection Requirements (continued)

BALL NUMBER

BALL NAME

CONNECTION REQUIREMENTS

F21

VPP_CORE

This ball must be left unconnected if unused.

VPP_MCU

F23

MMC1_CALPAD

D24

MMC0_CALPAD

AG5

SERDES0_REFCLKN

AG6

SERDES0_REFCLKP

AC9

SERDES0_REFRES

AH3

SERDES0_RXN

AG2

SERDES0_RXP

AH4

SERDES0_TXN

AG3

SERDES0_TXP

AH6

SERDES1_REFCLKN

AH7

SERDES1_REFCLKP

AC14

SERDES1_REFRES

AG9

SERDES1_RXN

AH10

SERDES1_RXP

AH9

SERDES1_TXN

AG8

SERDES1_TXP

(1) To determine which power supply is associated with any IO refer to Table 4-1, Pin Attributes.

Table 4-77. Reserved Balls Specific Connection Requirements

BALLS

CONNECTION REQUIREMENTS

AA6 (RSV2), B1 (RSV3), AC23 (RSV4), C12 (RSV5), F9 (RSV6),

F10 (RSV7), AD10 (RSV8), AC13 (RSV9), B28 (RSV10), A27

(RSV11), D23 (RSV12), E23 (RSV13), W6 (TEMP_DIODE_P), F16

(DDR_FS_RESETn)

These balls must be left unconnected.

V4 (RSV1)

These balls must be connected to VSS through a separate external

pull resistor to ensure these balls are held to a valid logic low level.

NOTE

All other unused signal balls with a Pad Configuration Register can be left unconnected with

their multiplexing mode set to GPIO input and internal pulldown resistor enabled.

Unused balls are defined as those which only connect to a PCB solder pad. This is the only

use case where internal pull resistors are allowed as the only source/sink to hold a valid logic

level.

Any balls connected to a via, test point, or PCB trace are considered used and must not

depend on the internal pull resistor to hold a valid logic level.

Internal pull resistors are weak and may not source enough current to maintain a valid logic

level for some operating conditions. This may be the case when connected to components

with leakage to the opposite logic level, or when external noise sources couple to signal

traces attached to balls which are only pulled to a valid logic level by the internal resistor.

Therefore, external pull resistors may be required to hold a valid logic level on balls with

external connections.

If balls are allowed to float between valid logic levels, the input buffer may enter a high-

current state which could damage the IO cell.

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