Document No.: FT_000589
FT313H USB2.0 HS Host Controller Datasheet Version 1.1
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
Microcontroller
CS_N
CS_E/CS_N
OE_N/RE_N/RD_N
RD_N
WE_N/WR_N
AD<15:0>
A<7:0>
INT
WR_N
AD<15:0>
A<7:0>
INT
DACK
DACK
DREQ
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
Microcontroller
CS_N
CS_E/CS_N
OE_N/RE_N/RD_N
RD_N
WE_N/WR_N
AD<7:0>
A<7:0>
INT
WR_N
AD<7:0>
A<7:0>
INT
DACK
DACK
DREQ
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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