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The SDRAM pin state during the
Table 6-12. Pin State During PRE Command
Pin
MSSD
SDWE
RAS
CAS
SDCKE
SDA10
Bank Active (ACT) Command
The
(Bank Active) command precedes any read or write access to a
ACT
page that was not accessed beforehand. The
with a
command. The
PRE
enable the SDRAM to latch the row address. The
the SDRAM page, which remains open until the next precharge com-
mand. This is done to keep the page open even if there are occurrences of
non-SDRAM accesses within a flow of accesses to a single SDRAM page.
Table 6-13. Pin State During ACT Command
Pin
MSSD
CAS
RAS
SDWE
SDCKE
ADSP-TS101 TigerSHARC Processor
Hardware Reference
command is shown in Table 6-12.
PRE
State
low
low
low
high
high
high
command asserts
ACT
State
low
high
low
high
high
SDRAM Interface
command is preceded
ACT
and
RAS
MSSD
command opens up
ACT
in order to
6-33
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