CY7C65640A
Configuration Options
Systems using TetraHub must have an external EEPROM in
order for the device to have a unique VID, PID, and DID. The
TetraHub can talk to SPI EEPROM that are double byte addres-
sable only. TetraHub uses the command format from the '040
parts. The TetraHub cannot talk to ‘080 EEPROM parts, as the
read command format used for talking to ‘080 is not the same as
‘040. The '010s and '020s uses the same command format as
used to interface with the ‘040 and hence these can also be used
to interface with the TetraHub.
Byte 0: 0xD2
Needs to be programmed with 0xD2
Byte 1: VID (LSB)
Least Significant Byte of Vendor ID
Byte 2: VID (MSB)
Most Significant Byte of Vendor ID
Byte 3: PID (LSB)
Least Significant Byte of Product ID
Byte 4: PID (MSB)]
Most Significant Byte of Product ID
Byte 5: DID (LSB)
Least Significant Byte of Device ID
Byte 6: DID (MSB)]
Most Significant Byte of Device ID
Byte 7: EnableOvercurrentTimer[3:0], DisabledOvercurrent-
Timer[3:0]
Count time in ms for filtering overcurrent detection. Bits 7–4
are for an enabled port, and bits 3–0 are for a disabled port.
Both range from 0 ms to 15 ms. See section . Default: 8 ms =
0x88.
Byte 8: ActivePorts[3:0], RemovablePorts[3:0]
Bits 7–4 are the ActivePorts[3:0] bits that indicates if the cor-
responding port is usable. For example, a two-port hub that
uses ports 1 and 4 would set this field to 0x09. The total num-
ber of ports reported in the Hub Descriptor: bNbrPorts field is
calculated from this. Bits 3–0 are the RemovablePorts[3:0]
bits that indicates whether the corresponding port is remov-
able (set to HIGH). This bit’s values are recorded appropriate-
ly in the HubDescriptor:DeviceRemovable field. Default:
0xFF.
Byte 9: MaximumPower
This value is reported in the ConfigurationDescriptor:bMax-
Power field and is the current in 2-mA intervals that is required
from the upstream hub. Default: 0x32 = 100 mA
Byte 10: HubControllerPower
This value is reported in the HubDescriptor:bHubContrCur-
rent field and is the current in milliamperes required by the
hub controller. Default: 0x64 = 100 mA.
Byte 11: PowerOnTimer
This
value
is
reported
in
the
HubDescrip-
tor:bPwrOn2PwrGood field and is the time in 2-ms intervals
from the SetPortPower command until the power on the cor-
responding downstream port is good. Default: 0x32 = 100 ms.
Byte 12: IllegalHubDescriptor, Unused, FullspeedOnly,
NoPortIndicators, Reserved, GangPowered, SingleTTOnly,
NoEOPatEOF1
Bit 7: IllegalHubDescriptor: For GetHubDescriptor request,
some USB hosts use a DescriptorTypeof 0x00 instead of
HUB_DESCRIPTOR, 0x29. According to the USB 2.0 stan-
dard, a hub must treat this as a Request Error, and STALL the
transaction accordingly (USB 2.0, 11.24.2.5). For systems
that do not accept this, the IllegalHubDescriptor configuration
bit may be set to allow TetraHub to accept a DescriptorType
Page 11 of 23
Default – 0xD0 Load
When used in default mode, only a unique VID, PID, and DID
must be present in the external SPI EEPROM. The contents of
the EEPROM must contain this information in the following
format:
Byte
0
1
2
3
4
5
6
Value
0xD0
VID (LSB)
VID (MSB)
PID (LSB)
PID (MSB)
DID (LSB)
DID (MSB)
Configured – 0xD2 Load
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
0xD2
VID (LSB)
VID (MSB)
PID (LSB)
PID (MSB)
DID (LSB)
DID (MSB)
EnableOverCurrentTimer[3:0], DisableOvercurrent-
Timer[3:0]
ActivePorts[3:0], RemovablePorts[3:0]
MaxPower
HubControllerPower
PowerOnTimer
IllegalHubDescriptor, Unused, FullspeedOnly,
NoPortIndicators, Reserved, GangPowered, SingleT-
TOnly, NoEOPatEOF1
Value (MSB->LSB)
Document #: 38-08019 Rev. *J
CYPRESS [ CYPRESS SEMICONDUCTOR ]
