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ADSP-2185 Datasheet(PDF) 6 Page - Analog Devices

Part No. ADSP-2185
Description  DSP Microcomputer
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADSP-2185 Datasheet(HTML) 6 Page - Analog Devices

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ADSP-2185
–6–
REV. 0
Idle
When the ADSP-2185 is in the Idle Mode, the processor waits
indefinitely in a low power state until an interrupt occurs. When
an unmasked interrupt occurs, it is serviced; execution then
continues with the instruction following the IDLE instruction.
In Idle mode IDMA, BDMA and autobuffer cycle steals still
occur.
Slow Idle
The IDLE instruction is enhanced on the ADSP-2185 to let the
processor’s internal clock signal be slowed, further reducing
power consumption. The reduced clock frequency, a program-
mable fraction of the normal clock rate, is specified by a select-
able divisor given in the IDLE instruction. The format of the
instruction is
IDLE (n);
where n = 16, 32, 64 or 128. This instruction keeps the proces-
sor fully functional, but operating at the slower clock rate. While
it is in this state, the processor’s other internal clock signals,
such as SCLK, CLKOUT and timer clock, are reduced by the
same ratio. The default form of the instruction, when no clock
divisor is given, is the standard IDLE instruction.
When the IDLE (n) instruction is used, it effectively slows down
the processor’s internal clock and thus its response time to in-
coming interrupts. The one-cycle response time of the standard
idle state is increased by n, the clock divisor. When an enabled
interrupt is received, the ADSP-2185 will remain in the idle
state for up to a maximum of n processor cycles (n = 16, 32, 64
or 128) before resuming normal operation.
When the IDLE (n) instruction is used in systems that have an
externally generated serial clock (SCLK), the serial clock rate
may be faster than the processor’s reduced internal clock rate.
Under these conditions, interrupts must not be generated at a
faster rate than can be serviced, due to the additional time the
processor takes to come out of the idle state (a maximum of n
processor cycles).
SYSTEM INTERFACE
Figure 2 shows typical basic system configurations with the
ADSP-2185, two serial devices, a byte-wide EPROM and optional
external program and data overlay memories (mode selectable).
Programmable wait state generation allows the processor to
easily connect to slow peripheral devices. The ADSP-2185 also
provides four external interrupts and two serial ports or six
external interrupts and one serial port.
Host Memory mode allows access to the full external data bus,
but limits addressing to a single address bit (A0). Additional
system peripherals can be added in this mode through the use of
external hardware to generate and latch address signals.
1/2x CLOCK
OR
CRYSTAL
SERIAL
DEVICE
SERIAL
DEVICE
SCLK1
RFS1 OR
IRQ0
TFS1 OR
IRQ1
DT1 OR FO
DR1 OR FI
SPORT1
SCLK0
RFS0
TFS0
DT0
DR0
SPORT0
A0-A21
DATA
CS
BYTE
MEMORY
I/O SPACE
(PERIPHERALS)
CS
DATA
ADDR
DATA
ADDR
2048 LOCATIONS
OVERLAY
MEMORY
TWO 8K
PM SEGMENTS
TWO 8K
DM SEGMENTS
D23-0
A13-0
D23-8
A10-0
D15-8
D23-16
A13-0
14
24
FL0-2
PF3
CLKIN
XTAL
ADDR13-0
DATA23-0
BMS
IOMS
PMS
DMS
CMS
BR
BG
BGH
PWD
PWDACK
ADSP-2185
1/2x CLOCK
OR
CRYSTAL
SERIAL
DEVICE
SYSTEM
INTERFACE
OR
µCONTROLLER
16
1
16
SPORT1
SCLK0
RFS0
TFS0
DT0
DR0
SPORT0
IAD15-0
IDMA PORT
FL0-2
PF3
CLKIN
XTAL
A0
DATA23-0
BMS
IOMS
PMS
DMS
CMS
BR
BG
BGH
PWD
PWDACK
ADSP-2185
IRQ2/PF7
IRQE/PF4
IRQL0/PF5
IRQL1/PF6
MODE C/PF2
MODE B/PF1
MODE A/PF0
HOST MEMORY MODE
IRQ2/PF7
IRQE/PF4
IRQL0/PF5
IRQL1/PF6
MODE C/PF2
MODE B/PF1
MODE A/PF0
HOST MEMORY MODE
IRD/D6
IWR/D7
IS/D4
SCLK1
RFS1 OR
IRQ0
TFS1 OR
IRQ1
DT1 OR FO
DR1 OR FI
SERIAL
DEVICE
IAL/D5
IACK/D3
Figure 2. Basic System Configuration
Clock Signals
The ADSP-2185 can be clocked by either a crystal or a TTL-
compatible clock signal.
The CLKIN input cannot be halted, changed during operation
or operated below the specified frequency during normal opera-
tion. The only exception is while the processor is in the power-
down state. For additional information, refer to Chapter 9,
ADSP-2100 Family User’s Manual, for detailed information on
this power-down feature.
If an external clock is used, it should be a TTL-compatible
signal running at half the instruction rate. The signal is con-
nected to the processor’s CLKIN input. When an external clock
is used, the XTAL input must be left unconnected.


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