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TM4C1294NCPDT: Some specification questions

erik lee2
Genius 3060 points
Part Number: TM4C1294NCPDT

hi,

we are kicking off some projects for some IOT projects.

now we focus on TM4C1294NCPDT, based on it, we have some questions need to clearify:

1> What's the maximum UART speed? If my system clock is the maximum speed of 120MHz

2> What's the "Trace" function?

 

3> if my PCBA wants to design 2 sets of TM4C1294NCPDT, and using the ethernet interface to connect between both of them, how to connect? EN0RXIN to EN0RXIN, EN0RXIP to EN0RXIP ... so on and on?

4> if using internal Ethernet PHY, and runing at the speed of 100Mbps, what's the maximum transmission range?

  • 0
    TI__Guru**** 184346 points

    Hi Erik,

    erik lee2 said:
    1> What's the maximum UART speed? If my system clock is the maximum speed of 120MHz

    The datasheet shows the calculation as BRD = BRDI + BRDF = UARTSysClk / (ClkDiv * Baud Rate) to find out what values to use for the UART baud rate divisor. You can use the API UARTConfigSetExpClk to configure the UART baudrate. However, the maximum UART speed will depend on the RS232 interface on your computer or the transceiver you use. Normally I don't see any issue at 115200. 

    erik lee2 said:
    2> What's the "Trace" function?

    The TRD0-3 and TRCLK provide for the ETM Trace on the TM4C129x devices. You can refer to the ARM CSDK for further information. 

    erik lee2 said:
    3> if my PCBA wants to design 2 sets of TM4C1294NCPDT, and using the ethernet interface to connect between both of them, how to connect? EN0RXIN to EN0RXIN, EN0RXIP to EN0RXIP ... so on and on?

    The EN0RXIN/P are for connecting to the transformer. Please refer to the system design guideline.

    http://www.ti.com/lit/an/spma056/spma056.pdf

    You can't just directly connect them between two MCUs. 

    erik lee2 said:
    4> if using internal Ethernet PHY, and runing at the speed of 100Mbps, what's the maximum transmission range?

    Are you asking the maximum transmission range as in distance? This will depend on your cable (i.e. Cat 5, Cat5e or Cat6).

  • 0 in reply to Charles Tsai
    Guru 117855 points

    Charles Tsai said:
    ...runing at the speed of 100Mbps, what's the maximum transmission range?

    Poster (and readers) must note that "Ethernet Speed & Transmission Distance" have an "inverse relationship."    It is thus "more usual" to "Adapt the Transmission Speed to the (far less flexible) Transmission Distance."    (such appears as "opposite of poster's approach"...)

    Much depends upon he quality of the interconnect and/or (other) MCU demands and the presence/activity of "noise sources!"    (at either end)