FT313HQ-R datasheet(54/67 Pages) FTDI

54 / 67 page

Document No.: FT_000589

FT313H USB2.0 HS Host Controller Datasheet Version 1.2

Clearance No.: FTDI# 318

Figure 7-1 FT313H Chip Schematic

7.1 Examples of Bus Interface connection

7.1.1 16-Bit SRAM asynchronous bus interface

FT313H

OE_N/RE_N/RD_N

CS_E/CS_N

WE_N/WR_N

AD<15:0>

A<7:0>

INT

DACK

DREQ

Microcontroller

CS_N

RD_N

WR_N

AD<15:0>

A<7:0>

INT

DACK

DREQ

If DMA transfers are not used the DACK and DREQ signals may be left floating or the DACK signal may be

terminated with external 10k ohm pull-down resistor.

If the microcontroller has no AD<0> pin for 16-bit wide devices, the unused AD<0> signal with must be

terminated with an external 10k ohm pull-down resistor.

7.1.2 8-Bit SRAM asynchronous bus interface

FT313H

OE_N/RE_N/RD_N

CS_E/CS_N

WE_N/WR_N

AD<7:0>

A<7:0>

INT

DACK

DREQ

Microcontroller

CS_N

RD_N

WR_N

AD<7:0>

A<7:0>

INT

DACK

DREQ

8-Bit SRAM bus interface doesn’t use high AD<15:8> data bus, must terminate AD<15:8> signals with

external 10k ohm pull-down resistors.

If DMA transfers are not used the DACK and DREQ signals may be left floating or the DACK signal may be

terminated with external 10k ohm pull-down resistor.

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