CY7C656XX_11 CYPRESS [Cypress Semiconductor], CY7C656XX_11 Datasheet - Page 13

• Manufacturer Part Number: CY7C656XX_11
• Manufacturer: CYPRESS [Cypress Semiconductor]

Configuration Options
Systems using CY7C656xx have the option of using a fuse
ROM, which is preset at the factory to configure the hub.
Otherwise, it must have an external EEPROM for the device to
have a unique VID, PID, and DID. The CY7C656xx can
communicate with SPI EEPROM that are either double byte
addressed or single byte with the ninth bit within the instruction
byte, such as the 24LC040 parts use. The 25LC080 EEPROM
uses the double byte address format. Therefore, the CY7C656xx
can communicate with these parts. The '010s and '020s use the
same command format that is used to interface with the ‘040 and
hence these can also be used to interface with the CY7C656xx.
If the attached EEPROM is blank (0xFF) the hub enumerates as
a vendor class device. In this configuration, the hub connects to
the Cypress driver to allow programming of the EEPROM. When
the EEPROM is programmed, a power cycle configures the chip
as a hub class device.
0xD0 Load
With this EEPROM format, 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:
0xD2 Load
Document Number: 38-08037 Rev. *S
Byte
Byte
10
12
0
1
2
3
4
5
6
11
0
1
2
3
4
5
6
7
8
9
0xD0
VID (LSB)
VID (MSB)
PID (LSB)
PID (MSB)
reserved
DID (MSB)
0xD2
VID (LSB)
VID (MSB)
PID (LSB)
PID (MSB)
reserved
DID (MSB)
EnabledOverCurrentTimer[3:0],
DisableOvercurrentTimer[3:0]
ActivePorts[3:0], RemovablePorts[3:0]
MaxPower
HubControllerPower
PowerOnTimer
IllegalHubDescriptor, CompoundDevice,
FullspeedOnly, NoPortIndicators, Reserved,
GangPowered, Reserved, Reserved
Value (MSBLSB)
Value
Byte 0: 0xD2
Byte 1: VID (LSB)
Byte 2: VID (MSB)
Byte 3: PID (LSB)
Byte 4: PID (MSB)]
Byte 5: Reserved
Byte 6: DID (MSB)]
Byte 7: EnabledOvercurrentTimer[3:0],
DisabledOvercurrentTimer[3:0]
Byte 8: ActivePorts[3:0], RemovablePorts[3:0]
Byte 9: MaximumPower
Byte 10: HubControllerPower
Byte 11: PowerOnTimer
Needs to be programmed with 0xD2
Least significant byte of vendor ID
Most significant byte of vendor ID
Least significant byte of product ID
Most significant byte of product ID
Reserved
Most significant byte of device ID
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
on page
Bits 7–4 are the ActivePorts[3:0] bits that indicates if the
corresponding port is usable. For example, a two-port hub
that uses ports 1 and 4 would set this field to 0x09. The total
number of ports reported in the Hub Descriptor: bNbrPorts
field
RemovablePorts[3:0]
corresponding logical port is removable (set to high). Logical
port numbers are from 1 to n where n is the total number of
active ports. If port 2 is disabled then physical ports 1, 3, and
4 map to logical ports 1, 2, and 3. These bit values are
reported
HubDescriptor:DeviceRemovable field. Default: 0xFF.
This value is reported in the
ConfigurationDescriptor:bMaxPower field and is the current
in 2 mA increments that is required from the upstream hub.
Default: 0x28 = 80 mA for full speed and 0x57 = 174 mA for
high speed.
This value is reported in the
HubDescriptor:bHubContrCurrent field and is the current in
milliamperes required by the hub controller.
Default: 0x50 = 80 mA for full speed and 0xAE = 174 mA for
high speed.
This value is reported in the
HubDescriptor:bPwrOn2PwrGood field and is the time in
2 ms intervals from the SetPortPower command until the
power on the corresponding downstream port is good.
Default: 0x32 = 100 ms.
is
6. Default: 8 ms = 0x88.
calculated
appropriately
bits
from
that
this.
indicates
Bits
CY7C656xx
in
3–0
Port Indicators
Page 13 of 28
whether
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