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MCIMX31LCJMN4D Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MCIMX31LCJMN4D Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
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9 / 108 page  Signal Descriptions MCIMX31C/MCIMX31LC Technical Data, Rev. 4.2 Freescale Semiconductor 9 3 Signal Descriptions Signal descriptions are in the reference manual. Special signal considerations are listed following this paragraph. The BGA ball assignment is in Section 5, “Package Information and Pinout,” on page 99. Special Signal Considerations: • Tamper detect (GPIO1_6) Tamper detect logic is used to issue a security violation. This logic is activated if the tamper detect input is asserted. The tamper detect logic is disabled after reset. After enabling the logic, it is impossible to disable it until the next reset. The GPR[16] bit functions as the tamper detect enable bit. GPIO1_6 functions similarly to other I/O with GPIO capabilities regardless of the status of the tamper detect enable bit. (For example, the GPIO1_6 can function as an input with GPIO capabilities, such as sampling through PSR or generating interrupts.) • Power ready (GPIO1_5) The power ready input, GPIO1_5, should be connected to an external power management IC power ready output signal. If not used, GPIO1_5 must either be (a) externally pulled-up to NVCC1 or (b) a no connect, internally pulled-up by enabling the on-chip pull-up resistor. GPIO1_5 is a dedicated input and cannot be used as a general-purpose input/output. • SJC_MOD SJC_MOD must be externally connected to GND for normal operation. Termination to GND through an external pull-down resistor (such as 1 k Ω) is allowed, but the value should be much smaller than the on-chip 100 k Ω pull-up. • CE_CONTROL CE_CONTROL is a reserved input and must be externally tied to GND through a 1 k Ω resistor. • M_REQUEST and M_GRANT These two signals are not utilized internally. The user should make no connection to these signals. • Clock Source Select (CLKSS) The CLKSS is the input that selects the default reference clock source providing input to the DPLL. To select CKIH, tie CLKSS to NVCC1. To select CKIL, tie CLKSS to ground. After initialization, the reference clock source can be changed (initial setting is overwritten) by programming the PRCS bits in the CCMR. 4 Electrical Characteristics This section provides the device-level and module-level electrical characteristics for the MCIMX31C. 4.1 Chip-Level Conditions This section provides the device-level electrical characteristics for the IC. See Table 4 for a quick reference to the individual tables and sections. |
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