STR720 datasheet(107/401 Pages) STMICROELECTRONICS

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STR720 - DRAM CONTROLLER (DRAMC)

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Bank 1 SDRAM Configuration Register High (SDRAM1ConfigHi)

Address Offset: 14h

Reset value: 0000h

The Bank 1 SDRAM Configuration Register High (SDRAM1ConfigHi) is a 16-bit write only

control register used to configure the SDRAM device of external region 1 (Bank 1). The

SDRAM1ConfigHi control bits are described below.

Bit 15:3

reserved (should be written as zero).

Bit 2

MIWE: Memory Interface Write Enable.

This bit allows to control directly the value on the SDRAM write enable line. When

it is written to ‘1’ the corresponding memory pin will be asserted to ‘0’ for one clock

period. This is a write-ony bit.

Bit 1

MIAA: Memory Interface Access Active (nCAS).

This bit allows to control directly the value on the SDRAM column address strobe

line. When it is written to ‘1’ the corresponding memory pin will be asserted to ‘0’

for one clock period. This is a write-ony bit.

Bit 0

MISA: Memory Interface Setup Active (nRAS).

This bit allows to control directly the value on the SDRAM row address strobe line.

When it is written to ‘1’ the corresponding memory pin will be asserted to ‘0’ for one

clock period. This is a write-ony bit.

Bank 2 SDRAM Configuration Register Low (SDRAM2ConfigLo)

Address Offset: 18h

Reset value: 0000h

The Bank 2 SDRAM Configuration Register Low (SDRAM2ConfigLo) is a 16-bit write only

control register used to configure the SDRAM device of external region 2 (Bank 2).

The SDRAM2ConfigLo control bits are the same as SDRAM1ConfigLo register.

765432

reserved

MIWE

MIAA

MISA

765432

reserved

MIAB

STR720 데이터시트(PDF) 107 Page - STMicroelectronics