Adsp-2181 Memory Interfaces - Analog Devices adsp-2100 Manual

CLKOUT
BR
xMS
RD
WR
B G
BGH
Figure 10.22 Bus Grant Hung (
10.6

ADSP-2181 MEMORY INTERFACES

The ADSP-2181 has the same modified Harvard architecture for internal
memory as the other processors of the ADSP-2100 family. In this
architecture, Data Memory stores data values and Program Memory
stores both instructions and data. The ADSP-2181 has as its full base
memory on-chip: 16K x 24-bit words of internal program memory RAM
and 16K x 16-bit words of internal data memory RAM.
There are four separate memory spaces: data memory, program memory,
byte memory, and I/O memory. To provide external access to these
memory spaces, the ADSP-2181 extends the internal address and data
buses off-chip and provides the
PMS DMS
The ,
being accessed.
The composite memory space (and its
chip memory be accessed as multiple memory spaces. The Composite
Memory Select register lets you define which memory spaces are selected
CMS
by the signal.
Memory Interface
BGH BGH BGH
BGH BGH
) Timing (ADSP-2171, ADSP-2181 only)
PMS
BMS IOMS
, , and signals indicate which memory space is
DMS BMS IOMS
, , , and
CMS
select line) lets a single off-
10
select lines.
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