Adsp-2181 Composite Memory Select - Analog Devices adsp-2100 Manual

labels to I/O memory addresses, use a #define macro. The best use of
the .PORT directive is in porting non-ADSP-2181 applications to the
ADSP-2181; otherwise, use I/O memory space for memory-mapped I/O.
10.6.5

ADSP-2181 Composite Memory Select

The ADSP-2181 has a programmable memory select signal, Composite
Memory Select (
devices mapped to more than one memory space, with the same timing as
other individual memory select signals (
Based on the value of CMSSEL in the Programmable Flag & Composite
Select Control register (see Figure 10.33), the ADSP-2181 asserts
15 14
0 1
BMWAIT
CMSSEL
1 = Enable CMS
0 = Disable CMS
Figure 10.33 CMSSEL Selection for
when the corresponding memory select signal (or signals) are asserted. Each
xMS
signal can be individually enabled. After reset, CMSSEL is initialized to
PMS
enable ,
Figure 10.26 (earlier in this chapter) shows an example of how to use the
Memory Interface
CMS
). This signal lets you generate a memory select for
Programmable Flag & Composite Select Control
13 12 11 10
1 1 1 0
IOM BM
CMS CMS
CMS CMS CMS
DMS IOMS
, and (with
PMS DMS BMS
, ,
9 8 7 6 5
1 1 0 0 0
DM PM
Signal
BMS
disabled).
IOMS
, and ).
CMS
4 3 2 1 0
0 0 0 0 0
PFTYPE
1 = Output
0 = Input
10
DM(0x3FE6)
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