LPC47M14X datasheet(26/205 Pages) SMSC

26 / 205 page

SMSC DS – LPC47M14X

Page 26

Rev. 03/19/2001

OFFSET

FIELD

PROGRAMMABLE

SIZE

DESCRIPTION

bPwrOn2PwrGood

Time (in 2 ms intervals) from the time power on

sequence begins on a port until power is good

on that port. System software uses this value

to determine how long to wait before accessing

a powered-on port.

bHubContrCurrent

Maximum current requirements of the hub

controller electronics in mA.

DeviceRemovable

Variable

depending

on number

of ports on

hub

Indicates if a port has a removable device

attached.

If a non-removable device is

attached to a port, that port will never receive

an insertion change notification. This field is

reported on byte-granularity. Within a byte, if

no port exists for a given location, the field

representing the port characteristics returns “0”.

Bit definition:

0 - Device is removable

1 - Device is not removable (permanently

attached)

This is a bitmap corresponding to the individual

ports on the hub:

Bit 0: Reserved for future use

Bit 1: Port 1

Bit 2: Port 2

Etc.

Bit n: Port n (implementation dependent, up to

a maximum of 255 ports).

Variable

PortPwrCtrlMask

Variable

depending

on number

of ports on

hub

Indicates if a port is not affected by a gang-

mode power control request. Ports that have

this field set always require a manual

SetPortFeature(PORT_POWER)

request

control the port’s power state.

Bit definition:

0 - Port does not mask the gang-mode power

control capability.

1 - Port is not affected by gang-mode power

commands. Manual commands must be sent

to this port to turn power on and off. This is a

bitmap corresponding to the individual ports on

the hub:

Bit 0: Reserved for future use.

Bit 1: Port 1

Bit 2: Port 2

Etc.

Bit n: Port n (implementation dependent, up to

a maximum of 255 ports).

6.5

FLOPPY DISK CONTROLLER

The Floppy Disk controller (FDC) provides the interface between a host microprocessor and the floppy disk drives.

The FDC integrates the functions of the Formatter/Controller, Digital data Separator, Write Precompensation and

Data Rate Selection logic for an IBM XT/AT compatible FDC. The true CMOS 765B core guarantees 100% IBM PC

XT/AT compatibility in addition to providing data overflow and underflow protection.

The FDC is compatible to the 82077AA using SMSC's proprietary floppy disk controller core.

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