UPD72012 datasheet(20/36 Pages) NEC

20 / 36 page

Data Sheet S13918EJ3V0DS

µPD72012

(4/4)

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

bDeviceRemovable

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.

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”.

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

ports are removable.

0x00

0xXX

bPortPwrCtrlMask

This field exists for reasons of compatibility with

software written for 1.0 compliant devices. All bits in

this field should be set to 1B.

0xFF

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