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TNETV6446AINZWT 数据表(PDF) 28 Page - Texas Instruments |
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TNETV6446AINZWT 数据表(HTML) 28 Page - Texas Instruments |
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28 / 227 page  TMS320DM6446 SPRS283H – DECEMBER 2005 – REVISED SEPTEMBER 2010 www.ti.com Table 2-6. Oscillator/PLL Terminal Functions SIGNAL TYPE(1) OTHER(2) DESCRIPTION NAME NO. OSCILLATOR, PLL Crystal input MXI for MX oscillator (system oscillator, typically 27 MHz). If a crystal MXI/CLKIN L1 I DVDD18 input is not used, but instead a physical clock-in source is supplied, this is the external oscillator clock input. Crystal output for MX oscillator. If a crystal input is not used, but instead a physical MXO M1 O DVDD18 clock-in source is supplied, MXO should be left as a No Connect. 1.8-V power supply for MX oscillator. If a crystal input is not used, but instead a MXVDD L5 S (3) physical clock-in source is supplied, MXVDD should still be connected to the 1.8-V power supply. Ground for MX oscillator. If a crystal input is not used, but instead a physical MXVSS L2 GND (3) clock-in source is supplied, MXVSS should still be connected to ground. Crystal input for M24 oscillator (24 MHz for USB). If a crystal input is not used, but M24XI F18 I DVDD18 instead a physical clock-in source is supplied, this is the external oscillator clock input. When the USB peripheral is not used, M24XI should be left as a No Connect. Crystal output for M24 oscillator. If a crystal input is not used, but instead a physical M24XO F19 O DVDD18 clock-in source is supplied, M24XO should be left as a No Connect. When the USB peripheral is not used, M24XO should be left as a No Connect. 1.8-V power supply for M24 oscillator. If a crystal input is not used, but instead a physical clock-in source is supplied, M24VDD should still be connected to the 1.8-V M24VDD F16 S (3) power supply. When the USB peripheral is not used, M24VDD should be connected to the 1.8-V power supply. Ground for M24 oscillator. If a crystal input is not used, but instead a physical M24VSS F17 GND (3) clock-in source is supplied, M24VSS should still be connected to ground. When the USB peripheral is not used, M24VSS should be connected to ground. PLLVDD18 M2 S (3) 1.8-V power supply for PLLs (system). (1) I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal (2) Specifies the operating I/O supply voltage for each signal (3) For more information, see Section 5.2, Recommended Operating Conditions. Table 2-7. Clock Generator Terminal Functions SIGNAL TYPE(1) OTHER(2) DESCRIPTION NAME NO. CLOCK GENERATOR This pin is multiplexed between the PLL1 clock generator and GPIO. CLK_OUT0/ K1 I/O/Z DVDD18 For the PLL1 clock generator, it is clock output CLK_OUT0. This is configurable for GPIO48 13.5 MHz or 27 MHz clock outputs. CLK_OUT1/ This pin is multiplexed between the USB clock generator, timer, and GPIO. TIM_IN/ E19 I/O/Z DVDD18 For the USB clock generator, it is clock output CLK_OUT1. This is configurable for GPIO49 12 MHz or 24 MHz clock outputs. (1) I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal (2) Specifies the operating I/O supply voltage for each signal Table 2-8. RESET and JTAG Terminal Functions SIGNAL TYPE(1) OTHER(2) (3) DESCRIPTION NAME NO. RESET IPU RESET L4 I This is the active low global reset input. DVDD18 JTAG IPU TMS E6 I JTAG test-port mode select input DVDD18 (1) I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal (2) IPD = Internal pulldown, IPU = Internal pullup. (To pull up a signal to the opposite supply rail, a 1-k Ω resistor should be used.) (3) Specifies the operating I/O supply voltage for each signal 28 Device Overview Copyright © 2005–2010, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TMS320DM6446 |
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