Document No.: FT_000589
FT313H USB2.0 HS Host Controller Datasheet Version 1.1
Clearance No.: FTDI# 318
4 Function Description
The FT313H is a USB2.0 compatible EHCI single port host controller which is mainly composed
of the following:
Microcontroller bus interface
SRAM bus interface mode
NOR bus interface mode
General multiplex bus interface mode
Interface mode lock
DMA controller
EHCI host controller
System clock
Power management
BCD mode
The functions for each block are briefly described in the following subsections.
4.1 Microcontroller Bus Interface
The FT313H has a fast advance general purpose interface to communicate with most types of
microcontrollers and microprocessors. This microcontroller interface is configured using pins
ALE/ADV_N and CLE to accommodate most types of interfaces. The bus interface supports 8-
bit and 16-bit, which can be configured using bit DATA_BUS_WIDTH. Three bus interface types
are selected using inputs ALE/ADV_N and CLE during power up, the RD_N /RE_N/OE_N and
CS_N/CE_N pins, or the RESET_N pin. Table 4.1 provides detail of bus configuration for each
mode. Table 4.2 shows pinout information of each bus interface.
Bus Mode
ALE/ADV_N
CLE
DATA_BUS
_WIDTH
Signal Description
A[7:0]: 8-bit address bus
AD[7:0]: 8-bit data bus
SRAM 8-bit
HIGH
HIGH
1
Write (WR_N), read (RD_N), chip
select (CS_N): control signals for
normal SRAM mode
DACK: DMA acknowledge input
DREQ: DMA request output
A[7:0]: 8-bit address bus
AD[15:0]: 16-bit data bus
SRAM 16-bit
HIGH
HIGH
0
Write (WR_N), read (RD_N), chip
select (CS_N): control signals for
normal SRAM mode
DACK: DMA acknowledge input
DREQ: DMA request output
AD[7:0]: 8-bit data bus
NOR 8-bit
HIGH
HIGH
LOW
LOW
LOW
HIGH
1
0
1
ADV_N, write enable, output enable,
chip select: control signals
AD[15:0]: 16-bit data bus
NOR 16-bit
ADV_N, write enable, output enable,
chip select: control signals
AD[7:0]: 8-bit data bus
ALE, write(WR_N), read(RD_N), chip
General
Multiplex 8-bit
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