ML674000 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

componentes Descripción

Fabricante

ML674000

32-bit General-purpose, ARM-based Microcontroller

Oki Electric Industry 

OKI Semiconductor

FEDL674000-02

ML674000

Pin Name I/O

Description

External Bus

XA[23:19]

Address bus to external RAM, external ROM, external I/O banks, and

O external DRAM. After a reset, these pins are configured for their primary

function (PIOA[14:10]).

XA[18:0]

Address bus to external RAM, external ROM, external I/O banks, and

O external DRAM

XD[15:0]

Data bus to external RAM, external ROM, external I/O banks, and external

I/O DRAM

External bus control signals

XROMCS_N

O ROM bank chip select

XRAMCS_N

O SRAM bank chip select

XIOCS_N[0]

O I/O bank 0 chip select

XIOCS_N[1]

O I/O bank 1 chip select

XOE_N

O Output enable/read enable

XWE_N

O Write enable

XBS_N[1:0]

O Byte select: XBS_N[1] for MSB; XBS_N[0] for LSB

XBWE_N[0]

O LSB write enable

XBWE_N[1]

O MSB write enable

XWR

Data transfer direction for external bus, used when connecting to Motorola

O I/O devices. This represents the secondary function of pin PIOA[15],

produced by setting bit 7 in the port control (GPCTL) register to "1."

XWAIT

External I/O bank 0 WAIT signal.

I This input permits access to devices slower than register settings.

External bus control signals (DRAM)

XRAS_N

O Row address strobe. Used for both EDO DRAM and SDRAM.

XCAS_N

O Column address strobe signal (SDRAM)

XSDCLK

O SDRAM clock (same frequency as internal system clock)

XSDCKE

O Clock enable (SDRAM)

XSDCS_N

O Chip select (SDRAM)

XDQM[1]/

XCAS_N[1]

Connected to SDRAM: DQM (MSB)

O

Connected to EDO DRAM: column address strobe signal (MSB)

XDQM[0]/

XCAS_N[0]

O Connected to SDRAM: DQM (LSB)

Connected to EDO DRAM: column address strobe signal (LSB)

Primary/ Logic

Secondary

Secondary Positive

—

Positive

—

Positive

—

Negative

—

Negative

—

Negative

—

Negative

—

Negative

—

Negative

—

Negative

—

Negative

—

Negative

Secondary

—

Secondary Positive

Secondary

Secondary

Secondary

Secondary

Secondary

Secondary

Secondary

Negative

Negative

—

—

Negative

Positive/

Negative

Positive/

Negative

11/24

Share Link: