CY4606 datasheet(13/28 Pages) CYPRESS

13 / 28 page

CY7C656xx

Document Number: 38-08037 Rev. *S

Page 13 of 28

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

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 6. 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

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

calculated

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 physical 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: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.

Byte 10: HubControllerPower

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.

Byte 11: PowerOnTimer

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.

Byte

Value

0xD0

VID (LSB)

VID (MSB)

PID (LSB)

PID (MSB)

reserved

DID (MSB)

Byte

Value (MSB

LSB)

0xD2

1VID (LSB)

VID (MSB)

3PID (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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