CY7C65621 datasheet(13/27 Pages) CYPRESS

13 / 27 page

CY7C65621/31

Document #: 001-52934 Rev. *C

Page 13 of 27

Configuration Options

Systems using CY7C65621/31 may 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 CY7C65621/31 can

communicate with SPI EEPROM that are either double byte

addressed or single byte with the 9th bit within the instruction

byte, such as the 24LC040 parts use. The 25LC080 EEPROM

uses the double byte address format, and therefore the

CY7C656xx can communicate with these parts. The '010s and

'020s use the same command format as is used to interface with

the ‘040. Therefore, these can also be used to interface with the

CY7C65621/31.

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

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: Reserved

Reserved

Byte 6: DID (MSB)]

Most Significant Byte of Device ID

Byte 7: EnabledOvercurrentTimer[3:0],

DisabledOvercurrentTimer[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 Port Indicators

on page 5. 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 sets this field to 0x09. The total number of

ports reported in the Hub Descriptor: bNbrPorts field is calcu-

lated from this. Bits 3–0 are the RemovablePorts[3:0] bits that

indicates whether the 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 phys-

ical ports 1, 3, and 4 map to logical ports 1, 2, and 3. These

bit

values

are

reported

appropriately

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 increments that is re-

quired from the upstream hub. Default: 0x28 = 80 mA for full

speed and 0x57 = 174 mA for high speed.

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: 0x50 = 80 mA for full speed and 0xAE

= 174 mA for high speed.

Byte 11: PowerOnTimer

This

value

reported

the

HubDescriptor:

bPwrOn2PwrGood field and is the time in 2 ms intervals from

the SetPortPower command until the power on the corre-

sponding downstream port is good. Default: 0x32 = 100 ms.

Byte

Value

0xD0

VID (LSB)

VID (MSB)

PID (LSB)

PID (MSB)

reserved

DID (MSB)

Byte

Value (MSB->LSB)

0xD2

VID (LSB)

VID (MSB)

PID (LSB)

PID (MSB)

reserved

DID (MSB)

EnabledOverCurrentTimer[3:0],

DisableOvercurrentTimer[3:0]

ActivePorts[3:0], RemovablePorts[3:0]

9MaxPower

HubControllerPower

PowerOnTimer

IllegalHubDescriptor, CompoundDevice,

FullspeedOnly, NoPortIndicators, Reserved,

GangPowered, Reserved, Reserved

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