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SM320C50 Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części SM320C50
Szczegółowy opis  DIGITAL SIGNAL PROCESSOR
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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SM320C50 Arkusz danych(HTML) 6 Page - Texas Instruments

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SMJ320C50/SMQ320C50
DIGITAL SIGNAL PROCESSOR
SGUS020B -- JUNE 1996 -- REVISED SEPTEMBER 2001
6
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251--1443
Terminal Functions
TERMINAL
DESCRIPTION
NAME
TYPE
DESCRIPTION
ADDRESS AND DATA BUSES
A15 (MSB)
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0 (LSB)
I/O/Z
Parallel address bus. Multiplexed to address external data, program memory, or I/O. A0--A15 are in the
high-impedance state in hold mode and when OFF is active (low). These signals are used as inputs for external DMA
access of the on-chip single-access RAM. They become inputs while HOLDA is active (low) if BR is driven low
externally.
D15 (MSB)
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0 (LSB)
I/O/Z
Parallel data bus. Multiplexed to transfer data between the core CPU and external data, program memory, or I/O
devices. D0--D15 are in the high-impedance state when not outputting data, when RS or HOLD is asserted, or when
OFF is active (low). These signals also are used in external DMA access of the on-chip single-access RAM.
MEMORY CONTROL SIGNALS
DS
PS
IS
O/Z
Data, program, and I/O space select signals. Always high unless asserted for communicating to a particular external
space. DS,PS, and IS are in the high-impedance state in hold mode or when OFF is active (low).
READY
I
Data ready input. Indicates that an external device is prepared for the bus transaction to be completed. If the device
is not ready (READY is low), the processor waits one cycle and checks READY again. READY also indicates a bus
grant to an external device after a BR (bus request) signal.
R/W
I/O/Z
Read/write. R/W indicates transfer direction during communication to an external device and is normally in read
mode (high) unless asserted for performing a write operation. R/W is in the high-impedance state in hold mode or
when OFF is active (low). Used in external DMA access of the 9K RAM cell, this signal indicates the direction of the
data bus for DMA reads (high) and writes (low) when HOLDA and IAQ areactive(low).
STRB
I/O/Z
Strobe. Always high unless asserted to indicate an external bus cycle, STRB is in the high-impedance state in the
hold mode or when OFF is active (low). Used in external DMA access of the on-chip single-access RAM and while
HOLDA and IAQ areactive(low),STRB is used to select the memory access.
RD
O/Z
Read select. RD indicates an active external read cycle and can connect directly to the output enable (OE) of external
devices. This signal is active on all external program, data, and I/O reads. RD is in the high-impedance state in hold
mode or when OFF is active (low).
I = Input, O = Output, Z = High-Impedance
NOTE: All input pins that are unused should be connected to VDD or an external pullup resistor. The BR pin has an internal pullup for performing
DMA to the on-chip RAM. For emulation, TRST has an internal pulldown, and TMS, TCK, and TDI have internal pullups. EMU0 and EMU1
require external pullups to support emulation.


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