Analog Devices adsp-2100 User Manual

10Memory Interface
10 – 35
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 (
CMS ). This signal lets you generate a memory select for
devices mapped to more than one memory space, with the same timing as
other individual memory select signals (
PMS , DMS , BMS , and IOMS ).
Based on the value of CMSSEL in the Programmable Flag & Composite
Select Control register (see Figure 10.33), the ADSP-2181 asserts CMS
Figure 10.33 CMSSEL Selection for
CMSCMS
CMSCMS
CMS Signal
when the corresponding memory select signal (or signals) are asserted. Each
xMS signal can be individually enabled. After reset, CMSSEL is initialized to
enable
PMS , DMS , and IOMS (with BMS disabled).
Figure 10.26 (earlier in this chapter) shows an example of how to use the
15141312111098 76 54 32 10
BMWAIT
1011110
Programmable Flag & Composite Select Control
PFTYPE
1 = Output
0 = Input
10000
CMSSEL
1 = Enable CMS
0 = Disable CMS
DM(0x3FE6)
0000
DMBMIOM PM

Analog Devices adsp-2100 Specifications

General

Brand	Analog Devices
Model	adsp-2100
Category	Computer Hardware
Language	English