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TMS320VC549GGUR100 Datasheet(PDF) 8 Page - Texas Instruments |
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TMS320VC549GGUR100 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 63 page  TMS320VC549 FIXEDPOINT DIGITAL SIGNAL PROCESSOR SPRS078G − SEPTEMBER 1998 − REVISED OCTOBER 2004 8 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 Signal Descriptions (Continued) TERMINAL DESCRIPTION NAME DESCRIPTION TYPE† INITIALIZATION, INTERRUPT AND RESET OPERATIONS (CONTINUED) NMI I Nonmaskable interrupt. NMI is an external interrupt that cannot be masked by way of the INTM or the IMR. When NMI is activated, the processor traps to the appropriate vector location. RS I Reset input. RS causes the DSP to terminate execution and forces the program counter to 0FF80h. When RS is brought to a high level, execution begins at location 0FF80h of the program memory. RS affects various registers and status bits. MP/MC I Microprocessor/microcomputer mode-select pin. If active-low at reset (microcomputer mode), MP/MC causes the internal program ROM to be mapped into the upper program memory space. In the microprocessor mode, off-chip memory and its corresponding addresses (instead of internal program ROM) are accessed by the DSP. CNT I I/O level select. With CMOS-compatible I/O interface levels, CNT is pulled to a high level. MULTIPROCESSING SIGNALS BIO I Branch control input. A branch can be conditionally executed when BIO is active. If low, the processor executes the conditional instruction. The BIO condition is sampled during the decode phase of the pipeline for the XC instruction, and all other instructions sample BIO during the read phase of the pipeline. XF O/Z External flag output (latched software-programmable signal). XF is set high by the SSBX XF instruction, set low by RSBX XF instruction or by loading the ST1 status register. XF is used for signaling other processors in multiprocessor configurations or as a general-purpose output pin. XF goes into the high-impedance state when OFF is low, and is set high at reset. MEMORY CONTROL SIGNALS DS PS IS O/Z Data, program, and I/O space select signals. DS, PS, and IS are always high unless driven low for communicating to a particular external space. Active period corresponds to valid address information. Placed into a high-impedance state in hold mode. DS, PS, and IS also go into the high-impedance state when EMU1/OFF is low. MSTRB O/Z Memory strobe signal. MSTRB is always high unless low-level asserted to indicate an external bus access to data or program memory. Placed in high-impedance state in hold mode. MSTRB also goes into the high-impedance state when OFF is low. READY I Data-ready input. READY indicates that an external device is prepared for a bus transaction to be completed. If the device is not ready (READY is low), the processor waits one cycle and checks READY again. Note that the processor performs ready-detection if at least two software wait states are programmed. The READY signal is not sampled until the completion of the software wait states. R/W O/Z Read/write signal. R/W indicates transfer direction during communication to an external device and is normally high (in read mode), unless asserted low when the DSP performs a write operation. Placed in the high-impedance state in hold mode, R/W also goes into the high-impedance state when EMU1/OFF is low. IOSTRB O/Z I/O strobe signal. IOSTRB is always high unless low level asserted to indicate an external bus access to an I/O device. Placed in high-impedance state in hold mode. IOSTRB also goes into the high-impedance state when EMU1/OFF is low. HOLD I Hold input. HOLD is asserted to request control of the address, data, and control lines. When acknowledged, these lines go into high-impedance state. HOLDA O/Z Hold acknowledge signal. HOLDA indicates to the external circuitry that the processor is in a hold state and that the address, data, and control lines are in a high-impedance state, allowing them to be available to the external circuitry. HOLDA also goes into the high-impedance state when EMU1/OFF is low. MSC O/Z Microstate complete signal. Goes low on CLKOUT falling at the start of the first software wait state. Remains low until one CLKOUT cycle before the last programmed software wait state. If connected to the READY line, MSC forces one external wait state after the last internal wait state has been completed. MSC also goes into the high-impedance state when EM1/OFF is low. † I = Input, O = Output, Z = High impedance |
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