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ADSP-2104 Datasheet(PDF) 6 Page - Analog Devices

Part No. ADSP-2104
Description  Low Cost DSP Microcomputers
Download  36 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADSP-2104 Datasheet(HTML) 6 Page - Analog Devices

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ADSP-2104/ADSP-2109
–6–
REV. 0
CLKIN
CLKOUT
XTAL
ADSP-2104/
ADSP-2109
Figure 2. External Crystal Connections
A clock output signal (CLKOUT) is generated by the processor,
synchronized to the processor’s internal cycles.
Reset
The RESET
signal initiates a complete reset of the processor.
The RESET signal must be asserted when the chip is powered
up to assure proper initialization. If the RESET signal is applied
during initial power-up, it must be held long enough to allow
the processor’s internal clock to stabilize. If RESET is activated
at any time after power-up and the input clock frequency does
not change, the processor’s internal clock continues and does
not require this stabilization time.
The power-up sequence is defined as the total time required for
the crystal oscillator circuit to stabilize after a valid VDD is
applied to the processor and for the internal phase-locked loop
(PLL) to lock onto the specific crystal frequency. A minimum of
2000 tCK cycles will ensure that the PLL has locked (this does
not, however, include the crystal oscillator start-up time).
During this power-up sequence the RESET signal should be
held low. On any subsequent resets, the RESET signal must
meet the minimum pulse width specification, tRSP.
To generate the RESET signal, use either an RC circuit with an
external Schmidt trigger or a commercially available reset IC.
(Do not use only an RC circuit.)
The RESET input resets all internal stack pointers to the empty
stack condition, masks all interrupts, and clears the MSTAT
register. When RESET is released, the boot loading sequence is
performed (provided there is no pending bus request and the
chip is configured for booting, with MMAP = 0). The first
instruction is then fetched from internal program memory
location 0x0000.
Program Memory Interface
The on-chip program memory address bus (PMA) and on-chip
program memory data bus (PMD) are multiplexed with the on-
chip data memory buses (DMA, DMD), creating a single
external data bus and a single external address bus. The external
data bus is bidirectional and is 24 bits wide to allow instruction
fetches from external program memory. Program memory may
contain code and data.
The external address bus is 14 bits wide.
The data lines are bidirectional. The program memory select
(PMS) signal indicates accesses to program memory and can be
used as a chip select signal. The write (WR) signal indicates a
write operation and is used as a write strobe. The read (RD)
signal indicates a read operation and is used as a read strobe or
output enable signal.
The processor writes data from the 16-bit registers to 24-bit
program memory using the PX register to provide the lower
eight bits. When the processor reads 16-bit data from 24-bit
program memory to a 16-bit data register, the lower eight bits
are placed in the PX register.
The program memory interface can generate 0 to 7 wait states
for external memory devices; default is to 7 wait states after
RESET
.
Figure 3. ADSP-2104/ADSP-2109 System
BR
BG
CLKIN
RESET
IRQ2
BMS
ADSP-2104
or
ADSP-2109
CLKOUT
ADDR
DATA
(OPTIONAL)
1x CLOCK
or
CRYSTAL
PMS
DMS
RD
WR
ADDR13-0
DATA23-0
ADDR
DATA
(OPTIONAL)
ADDR
DATA
BOOT
MEMORY
e.g. EPROM
2764
27128
27256
27512
PROGRAM
MEMORY
DATA
MEMORY
&
PERIPHERALS
14
24
D23-22
A13-0
D15-8
D23-0
D23-8
A13-0
A13-0
XTAL
MMAP
SERIAL
DEVICE
(OPTIONAL)
SCLK1
RFS1
or IRQ0
TFS1
or IRQ1
DT1
or FO
DR1
or FI
SCLK0
RFS0
TFS0
DT0
DR0
SPORT 1
SPORT 0
SERIAL
DEVICE
(OPTIONAL)
OE
WE
CS
OE
WE
CS
OE
CS
THE TWO MSBs OF THE DATA BUS (D23-22) ARE USED TO SUPPLY THE TWO MSBs OF THE
BOOT MEMORY EPROM ADDRESS. THIS IS ONLY REQUIRED FOR THE 27256 AND 27512.


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