FT313HQ-R datasheet(26/67 Pages) FTDI

26 / 67 page

Document No.: FT_000589

FT313H USB2.0 HS Host Controller Datasheet Version 1.2

Clearance No.: FTDI# 318

5.2.7 FRINDEX register (address = 1Ch)

This register is used by the host controller to index into the periodic frame. The register updates very 125

microseconds (one each micro-frame).

Bit

Name

Type

Default value

Description

[31:14]

Reserved

28’h0

[13:0]

FRINDEX

R/W

14’b0

Frame Index

This register is used by the host controller to

index the frame into the Periodic Frame List. It

updates every 125 microseconds. This register

cannot be written unless the host controller is

at the halted state.

Bits[N:3] are used for Frame List current

index. This means that each location of the

frame list is accessed 8 times before moving

to the next index.

USBCMD[Frame List Size] Number Elements N

00b

(1024)

01b

(512)

10b

(256)

11b

Reserved

Table 5-8 Frame index register

5.2.8 PERIODICLISTADDR register (address = 24h)

This 32-bit register contains the beginning address of the periodic frame list in the system memory.

Bit

Name

Type

Default value

Description

[31:12]

PERI_BASEADR

R/W

20’h0

Periodic Frame List Base Address

This 32-bit register contains the beginning

address of the

Periodic Frame List in the system memory.

These bits correspond to the memory address

signals[31:12].

[11:0]

Reserved

12’b0

Table 5-9 Periodic frame list base address register

5.2.9 ASYNCLISTADDR register (address = 28h)

This 32-bit register contains the address of the next asynchronous queue head to be executed.

Bit

Name

Type

Default value

Description

[31:5]

ASYNC_LADR

R/W

27’h0

Current Asynchronous List Address

This 32-bit register contains the address of the

next asynchronous queue head to be

executed. These bits correspond to the

memory address signals [31:5].

[4:0]

Reserved

5’b0

Table 5-10 Current asynchronous list address register

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