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UPD72012

HUB CONTROLLER FOR UNIVERSAL SERIAL BUS

NEC => Renesas Technology 

µPD72012

No.

Field

7 bDeviceRemovable

Size

(Bytes)

Contents

1 Uses a bitmap to show whether or not removable

devices are connected to HUB ports.

“1” shows that the connected device is non-

removable, and “0” shows that it is removable. Set

“1” if a port that is used cannot be connected nor

disconnected using an external circuit.

Note that, if a non-removable device is connected to

a downstream port of the HUB, bit 2 of

wHubCharacteristics field should be set to “1”.

When the number of ports that can be port enabled

is limited by the PVSEL pin setting or Mask ROM

code product settings, set “0” for all ports that are

not port enabled. The meaning of the bitmap is as

follows.

Value

(4/4)

Standard ROM code

product

003

004

Mask

ROM code

product

0x00

0x00

0xXX

Bit 0: Always set to “0”.

Bit 1: If “1”, the device connected to port 1 is

non-removable.

Bit 2: If “1”, the device connected to port 2 is

non-removable.

Bit 3: If “1”, the device connected to port 3 is

non-removable.

Bit 4: If “1”, the device connected to port 4 is

non-removable.

Bit 5: If “1”, the device connected to port 5 is

non-removable.

Bits 7,6: Always set to “0”.

8 bPortPwrCtrlMask

For a standard ROM code product (003, 004), all

ports are removable.

1 This field exists for reasons of compatibility with

0xFF

software written for 1.0 compliant devices. All bits in

this field should be set to 1B.

0xFF

0xFF

20

Data Sheet S13918EJ3V0DS

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