Document No.: FT_000589
FT313H USB2.0 HS Host Controller Datasheet Version 1.1
Clearance No.: FTDI# 318
Bit
Name
Type
Default value
Description
This value reflects the current state of the port,
and may not correspond directly to cause the
Connect Status Change bit to be set.
Table 5-11 Port status and control register
5.3 Configuration registers
5.3.1 EOTTIME register (address = 34h)
Bit
Name
Type
Default
value
Description
[31:7]
6
Reserved
RO
25’h0
-
Transceiver Suspend Mode
U_SUSP_N
R/W
1’b1
Active low
Places the transceiver in the suspend mode that draws
the minimal power from the power supplies. This is
part of the power management.
EOF 2 Timing Points
[5:4]
EOF2_TIME
R/W
2’b00
Control EOF2 timing point before next SOF.
High-Speed EOF2 Time
00b 2 clocks (30 MHz) = 66 ns
01b 4 clocks (30 MHz) = 133 ns
10b 8 clocks (30 MHz) = 266 ns
11b 16 clocks (30 MHz) = 533 ns
Full-Speed EOF2 Time
00b 20 clocks (30 MHz)=8 clocks (12 MHz) = 666 ns
01b 40 clocks (30 MHz)=16 clocks (12 MHz) = 1.333 µs
10b 80 clocks (30 MHz) = 32 clocks (12 MHz) = 2.66 µs
11b 160 clocks (30 MHz) = 64 clocks (12 MHz) = 5.3 µs
Low-Speed EOF2 Time
00b 40 clocks (30 MHz) = 16 clocks (12 MHz) = 1.33 µs
01b 80 clocks (30 MHz) = 32 clocks (12 MHz) = 2.66 µs
10b 160 clocks (30 MHz) = 64 clocks (12 MHz) = 5.33 µs
11b 320 clocks (30 MHz) = 128 clocks (12 MHz) = 10.66 µs
EOF 1 Timing Points
[3:2]
EOF1_TIME
R/W
2’b00
Controls the EOF1 timing point before next SOF.
This value should be adjusted according to the
maximum packet size.
High-Speed EOF1 Time
00b 540 clocks (30 MHz) = 18 µs
01b 360 clocks (30 MHz) = 12 µs
10b 180 clocks (30 MHz) = 6 µs
11b 720 clocks (30 MHz) = 24 µs
Full-Speed EOF1 Time
00b 1600 clocks (30 MHz) = 640 clocks (12 MHz) = 53.3 µs
01b 1400 clocks (30 MHz) = 560 clocks (12 MHz) = 46.6 µs
10b 1200 clocks (30 MHz) = 480 clocks (12 MHz) = 40 µs
11b 21000 clocks (30 MHz) = 8400 clocks (12 MHz)=700 µs
Low-Speed EOF1 Time
Copyright © 2012 Future Technology Devices International Limited
29
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
