C6416 datasheet(39/134 Pages) TI1

39 / 134 page

SMJ320C6414, SMJ320C6415, SMJ320C6416

FIXEDPOINT DIGITAL SIGNAL PROCESSORS

SGUS050A − JANUARY 2004 − REVISED MARCH 2004

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

DEVICE CONFIGURATIONS (CONTINUED)

multiplexed pins

Multiplexed pins are pins that are shared by more than one peripheral and are internally multiplexed. Some of

these pins are configured by software, and the others are configured by external pullup/pulldown resistors only

at reset. Those MUXed pins that are configured by software can be programmed to switch functionalities at any

time. Those MUXed pins that are configured by external pullup/pulldown resistors are mutually exclusive; only

one peripheral has primary control of the function of these pins after reset. Table 29 identifies the multiplexed

pins on the C6414, C6415, and C6416 devices; shows the default (primary) function and the default settings

after reset; and describes the pins, registers, etc. necessary to configure specific multiplexed functions.

debugging considerations

It is recommended that external connections be provided to device configuration pins, including

CLKMODE[1:0], BEA[20:13, 11, 9:7], HD5/AD5, PCI_EN, and MCBSP2_EN. Although internal pullup/pulldown

resistors exist on these pins (except for HD5/AD5), providing external connectivity adds convenience to the user

in debugging and flexibility in switching operating modes.

Internal pullup/pulldown resistors also exist on the non-configuration pins on the BEA bus (BEA[12, 10, 6:1]).

Do not oppose the internal pullup/pulldown resistors on these non-configuration pins with external

pullup/pulldown resistors. If an external controller provides signals to these non-configuration pins, these

signals must be driven to the default state of the pins at reset, or not be driven at all.

For the internal pullup/pulldown resistors on the C6414, C6415, and C6416 device pins, see the terminal

functions table.

C6416 Datasheet(PDF) 39 Page - Texas Instruments