ADSP-2185MBSTZ-266 Analog Devices Inc, ADSP-2185MBSTZ-266 Datasheet - Page 12

• Manufacturer Part Number: ADSP-2185MBSTZ-266
• Description: 75mhz 16k/16k 2.5v LQFP
• Manufacturer: Analog Devices Inc
• Series: ADSP-21xxr
• Type: Fixed Pointr

Specifications of ADSP-2185MBSTZ-266

• Interface: Host Interface, Serial Port
• Clock Rate: 66MHz
• Non-volatile Memory: External
• On-chip Ram: 80kB
• Voltage - I/o: 3.30V
• Voltage - Core: 2.50V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Package: 100LQFP
• Numeric And Arithmetic Format: Fixed-Point
• Maximum Speed: 66 MHz
• Ram Size: 80 KB
• Device Million Instructions Per Second: 66 MIPS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADSP-2185MBSTZ266

PMOVLAY
0
1
2
Active Configuration
Active Configuration involves the use of a three-statable external
driver connected to the Mode C pin. A driver’s output enable
should be connected to the DSP’s RESET signal such that it
only drives the PF2 pin when RESET is active (low). When
RESET is deasserted, the driver should three-state, thus allow-
ing full use of the PF2 pin as either an input or output. To
minimize power consumption during power-down, configure
the programmable flag as an output when connected to a three-
stated buffer. This ensures that the pin will be held at a constant
level, and will not oscillate should the three-state driver’s level
hover around the logic switching point.
IACK Configuration
Mode D = 0 and in host mode: IACK is an active, driven signal
and cannot be “wire OR’d.”
Mode D = 1 and in host mode: IACK is an open drain and
requires an external pull-down, but multiple IACK pins can be
“wire OR’d” together.
ADSP-2185M
Memory
Internal
External Overlay 1
External Overlay 2
EXTERNAL
MEMORY
ALWAYS
ACCESSIBLE
AT ADDRESS
0x0000 – 0x1FFF
ACCESSIBLE WHEN
PMOVLAY = 0
PM (MODE B = 0)
PROGRAM MEMORY
PMOVLAY = 1, 2
ACCESSIBLE WHEN
PMOVLAY = 1
8K EXTERNAL
8K INTERNAL
PMOVLAY = 0
INTERNAL
MODE B = 0
8K
OR
ACCESSIBLE WHEN
PMOVLAY = 2
0x2000 –
0x3FFF
ADDRESS
0 x 3FFF
0 x 2000
0 x 1FFF
0 x 0000
0 x 2000 –
0 x 3FFF
Table III. PMOVLAY Bits
A13
Not Applicable
0
1
0 x 2000 –
0 x 3FFF
2
2
PM (MODE B = 1)
RESERVED
MEMORY ARCHITECTURE
The ADSP-2185M provides a variety of memory and peripheral
interface options. The key functional groups are Program Memory,
Data Memory, Byte Memory, and I/O. Refer to the following
figures and tables for PM and DM memory allocations in the
ADSP-2185M.
Program Memory
Program Memory (Full Memory Mode) is a 24-bit-wide
space for storing both instruction opcodes and data. The ADSP-
2185M has 16K words of Program Memory RAM on chip, and
the capability of accessing up to two 8K external memory over-
lay spaces using the external data bus.
Program Memory (Host Mode) allows access to all internal
memory. External overlay access is limited by a single external
address line (A0). External program execution is not available in
host mode due to a restricted data bus that is 16 bits wide only.
ACCESSIBLE WHEN
PMOVLAY = 0
EXTERNAL
MEMORY
NOTES:
1
2
WHEN MODE B = 1, PMOVLAY MUST BE SET TO 0
SEE TABLE III FOR PMOVLAY BITS
PROGRAM MEMORY
1
8K INTERNAL
PMOVLAY = 0
ACCESSIBLE WHEN
PMOVLAY = 0
MODE B = 1
EXTERNAL
A12:0
Not Applicable
13 LSBs of Address Between 0x2000 and 0x3FFF
13 LSBs of Address Between 0x2000 and 0x3FFF
8K
RESERVED
0x2000 –
0x3FFF
ADDRESS
0 x 3FFF
0 x 2000
0 x 1FFF
0 x 0000
0 x 0000 –
0 x 1FFF
0 x 0000 –
0 x 1FFF
2
2