10 Memory Interface
10 – 38
Access
PMS DMS BMS RD
R
Address Data
Internal program high high high high high tristated tristated
memory only
Internal data high high high high high tristated tristated
memory only
Internal program high low high low low DM address DM data
memory, external (for (for
data memory read) write)
Internal data low high high low low PM address PM data
memory, external (for (for
program memory read) write)
External boot high high low low high Boot address Boot data,
memory (for Boot page
read) address
Table 10.5 Pin States During Memory Accesses
Operation Address Data
CLKOUT SPORTs
Reset tristated tristated high high active tristated high
Booting* active active
active
active active tristated high
after Reset
,
high
high
Asserted tristated tristated tristated tristated active active low
during Normal
Operation, Booting*,
or Go Mode
Asserted
tristated tristated tristated tristated active tristated low
during Reset
Reboot* active active
active
active active high
,
high
high
active
Table 10.6 Pin States During Reset, Booting*, and Bus Grant
* ADSP-21xx boot memory booting, not ADSP-2181 byte memory booting.
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