FT313HQ-R datasheet(22/67 Pages) ETC2

22 / 67 page

Document No.: FT_000589

FT313H USB2.0 HS Host Controller Datasheet Version 1.2

Clearance No.: FTDI# 318

5.2.3 HCCPARAMS register (address = 08h)

This is multiple mode control (time base bit functionality) and addressing capability.

Bit

Name

Type

Default value

Description

[31:3]

Reserved

29’h0

ASPC

1’b1

Asynchronous Schedule Park Capability

The host controller supports the park feature for

high-speed queue heads in the Asynchronous

Schedule. This feature can be disabled or

enabled and set to a specific level by using the

Asynchronous Schedule Park Mode Enable and

Asynchronous Schedule Park Mode Count fields

in the USBCMD register.

PFLF

1’b1

Programmable Frame List Flag

When this bit is set to 1b, the system software

can specify and use a smaller frame list and

configure the host controller via Frame List Size

field of the USBCMD register. This requirement

ensures that the frame list is always physically

contiguous.

Reserved

1’b0

Table 5-4 Capability parameter register

5.2.4 USBCMD register (address = 10h)

The command register indicates the command to be executed by the serial bus host controller. Writing to

the register causes a command to be executed.

Bit

Name

Type

Default value

Description

[31:24]

Reserved

8’h0

[23:16]

INT_THRC

R/W

8’h08

Interrupt Threshold Control

This field is used by the system software to

select the maximum rate at which the host

controller will issue the interrupts. The only

valid values are described as below:

Value Max Interrupt Interval for the high-speed

00h

Reserved

01h

No limited interval

02h

2 micro-frames

04h

4 micro-frames

08h

8 micro-frames (Default, equals to 1 ms)

10h

16 micro-frames (2 ms)

20h

32 micro-frames (4 ms)

40h

64 micro-frames (8 ms)

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