μ
PD720210
4. USB Descriptor Information
R19UH0093EJ0200 Rev.2.00
Page 21 of 59
May 26, 2014
4.1.4 Hub
Descriptor
Table 4-10. Hub Descriptor
Field Name
Size(Byte)
Value
Description
bLength
1
0Ch
Size of Descriptor (12 bytes)
bDescriptorType
1
2Ah
Descriptor type (HUB)
bNbrPorts
1
04h
Number of downstream facing ports (4 port) (Note 1)
wHubCharacteristics 2
09h
Hub
Characteristics
(Individual Power Switching, Not part of a
compound device, Individual Over current protection)(Note 2)
bPwrOn2PwrGood
1
32h
Time from Power on to Power Good (100 ms) (Note 3)
bHubContrCurrent
1
32h
Maximum current of Hub Controller
(aCurrentUnit(4mA)*32h = 200 mA)
bHubHdrDecLat
1
01h
Hub Packet Header Decode Latency (0.1
μ
s)
wHubDelay
2
012Ch
Average delay of forwarding packet (300 ns)
DeviceRemovable
2
0000h
Removable device attached
(All 4 downstream ports are removable) (Note 4)
Note 1
:
The value can be overridden by ROM setting or Strap pin setting
Note 2
: Bit[3], Bit[2], Bit[0] =
The value can be overridden by ROM setting
Note 3
:
The value can be overridden by ROM setting or Strap pin setting (32h or 00h)
Note 4
:
Bit[4:1] = The value can be overridden by ROM setting or Strap pin setting
Summary of Contents for Renesas mPD720210
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