HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 848

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 24
24.3.18 Hc LS Threshold Register (USBHLST)
USBHLST includes an 11-bit value that is used by the host controller to determine whether or not
to authorize the transfer of the LS packed 8 bytes in maximum before EOF. The host controller
and host controller driver cannot change this value.
Rev. 3.00 Jan. 18, 2008 Page 786 of 1458
REJ09B0033-0300
Bit
31 to 12 
11
10
9
8
7
6
5
4
3
2
1
0
Bit Name
LST11
LST10
LST9
LST8
LST7
LST6
LST5
LST4
LST3
LST2
LST1
LST0
USB Host Controller (USBH)
Initial
Value
All 0
0
1
1
0
0
0
1
0
1
0
0
0
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
LS Threshold
This field contains a value to be compared with the FR bit
prior to the beginning of low-speed transaction. The
transaction is started only when the FR bit value is beyond
the value of the list. The value is calculated by HCD
considering the transmission and set-up overhead.