
SMSC DS – LPC47M14X 
Page 26 
Rev. 03/19/2001 
OFFSET 
5 
FIELD
PROGRAMMABLE 
SIZE 
1 
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. 
Maximum current requirements of the hub 
controller electronics in mA. 
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). 
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) 
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 
bHubContrCurrent
1 
7 
DeviceRemovable
X 
Variable 
depending 
on number 
of ports on 
hub 
Variable 
PortPwrCtrlMask 
X 
Variable 
depending 
on number 
of ports on 
hub 
request 
to 
6.5 
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. 
FLOPPY DISK CONTROLLER