Precharge All; Read/Write - Analog Devices SHARC ADSP-214 Series Hardware Reference Manual

SDRAM Controller (ADSP-2147x/ADSP-2148x)

Precharge All

The precharge all command is given to precharge all internal banks at the
same time before executing an auto-refresh. All open banks are automati-
cally closed. This is possible since the SDC uses a separate
which is asserted high during this command. This command proceeds the
auto-refresh command. Also, for single bank operation, this command is
used to close any open bank after a page miss detection.

Read/Write

This command is executed if the next read/write access is in the present
active page. During the read command, the SDRAM latches the column
address. The delay between activate and read commands is determined by
the t parameter. Data is available from the SDRAM after the CAS
RCD
latency has been met.
In the write command, the SDRAM latches the column address. The
write data is also valid in the same cycle. The delay between activate and
write commands is determined by the t
The SDC does not use the auto-precharge function of SDRAMs, which is
enabled by asserting
3-22
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RCD
high during a read or write command.
SDA10
ADSP-214xx SHARC Processor Hardware Reference
SDA10
parameter.
pin