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TMS320UC5409GGUR80 Datasheet(PDF) 9 Page - Texas Instruments

Part # TMS320UC5409GGUR80
Description  FIXED-POINT DIGITAL SIGNAL PROCESSOR
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Manufacturer  TI1 [Texas Instruments]
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TMS320UC5409GGUR80 Datasheet(HTML) 9 Page - Texas Instruments

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TMS320UC5409
FIXEDPOINT DIGITAL SIGNAL PROCESSOR
SPRS101E − APRIL 1999 − REVISED OCTOBER 2008
9
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
Terminal Functions (Continued)
TERMINAL
NAME
DESCRIPTION
I/O†
TERMINAL
NAME
DESCRIPTION
I/O†
INITIALIZATION, INTERRUPT, AND RESET OPERATIONS (CONTINUED)
RS
I
Reset. RS causes the digital signal processor (DSP) to terminate execution and causes a reinitialization of the CPU
and peripherals. When RS is brought to a high level, execution begins at location 0FF80h of program memory. RS
affects various registers and status bits.
MP/MC
I
Microprocessor/microcomputer mode select. If active low at reset, microcomputer mode is selected, and the internal
program ROM is mapped into the upper program memory space. If the pin is driven high during reset, microprocessor
mode is selected, and the on-chip ROM is removed from program space. MP/MC is only sampled at reset, and the
MP/MC bit of the PMST register can override the mode that is selected at reset.
MULTIPROCESSING SIGNALS
BIO
I
Branch control. A branch can be conditionally executed when BIO is active. If low, the processor executes the
conditional instruction. For the XC instruction, the BIO condition is sampled during the decode phase of the pipeline;
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
the RSBX XF instruction or by loading ST1. XF is used for signaling other processors in multiprocessor configurations
or used 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 accessing a
particular external memory space. Active period corresponds to valid address information. DS, PS, and IS are placed
into the high-impedance state in the hold mode; the signals also go into the high-impedance state when 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. MSTRB is placed in the high-impedance state in the hold mode; it also goes into the
high-impedance state when OFF is low.
READY
I
Data ready. 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. R/W is normally in
the read mode (high), unless it is asserted low when the DSP performs a write operation. R/W is placed in the
high-impedance state in hold mode; it also goes into the high-impedance state when 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.
IOSTRB is placed in the high-impedance state in the hold mode; it also goes into the high-impedance state when OFF
is low.
HOLD
I
Hold. HOLD is asserted to request control of the address, data, and control lines. When acknowledged by the C54x,
these lines go into the high-impedance state.
HOLDA
O/Z
Hold acknowledge. HOLDA indicates that the UC5409 is in a hold state and that the address, data, and control lines
are in the high-impedance state, allowing the external memory interface to be accessed by other devices. HOLDA
also goes into the high-impedance state when OFF is low.
MSC
O/Z
Microstate complete. MSC indicates completion of all software wait states. When two or more software wait states
are enabled, the MSC pin goes low during the last of these wait states. If connected to the READY input, MSC forces
one external wait state after the last internal wait state is completed. MSC also goes into the high-impedance state
when OFF is low.
IAQ
O/Z
Instruction acquisition signal. IAQ is asserted (active low) when there is an instruction address on the address bus.
IAQ goes into the high-impedance state when OFF is low.
† I = Input, O = Output, Z = High-impedance, S = Supply
‡ Although this pin includes an internal pulldown resistor, a 470-Ω external pulldown is required. If the TRST pin is connected to multiple DSPs,
a buffer is recommended to ensure the VIL and VIH specifications are met.
Not Recommended For New Designs


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