UMFT313EV FTDI, UMFT313EV Datasheet - Page 26

• Manufacturer Part Number: UMFT313EV
• Description: Interface Development Tools FT313H Hi-Speed USB Host Dev Module
• Manufacturer: FTDI
• Type: USBr

Specifications of UMFT313EV

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: FT313H
• Interface Type: USB
• Operating Supply Voltage: 5 V
• For Use With: FT313H

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
[31:14]
[13:0]
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
[31:12]
[11:0]
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
[31:5]
[4:0]
Table 5-10 Current asynchronous list address register
Name
Reserved
FRINDEX
Name
PERI_BASEADR
Reserved
Name
ASYNC_LADR
Reserved
Copyright © 2012 Future Technology Devices International Limited
Type
RO
R/W
Type
R/W
RO
Type
R/W
RO
FT313H USB2.0 HS Host Controller Datasheet Version 1.1
Default value
28’h0
14’b0
Default value
20’h0
12’b0
Default value
27’h0
5’b0
Description
-
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
01b
10b
11b
Description
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].
-
Description
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].
-
Document No.: FT_000589
Clearance No.: FTDI# 318
(1024)
(512)
(256)
Reserved
12
11
10
26