isp1562 NXP Semiconductors, isp1562 Datasheet - Page 73

• Manufacturer Part Number: isp1562
• Description: Hi-speed Universal Serial Bus Pci Host Controller
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 109. PORTSC 1, 2 - Port Status and Control 1, 2 register bit description
Address: Content of the base address register + 64h + (4
[1]
ISP1562_2
Product data sheet
Bit
3
2
1
0
These fields read logic 0, if the PP bit is logic 0.
Symbol
PEDC
PED
ECSC
ECCS
Description
Port Enable/Disable Change: Logic 1 means the port enabled or disabled status has
changed. Logic 0 means no change. Default = 0. For the root hub, this bit is set only when a
port is disabled because of the appropriate conditions existing at the EOF2 point. For definition
of port error, refer to Chapter 11 of Universal Serial Bus Specification Rev. 2.0 . Software clears
this bit by setting it.
Port Enabled/Disabled: Logic 1 means enable. Logic 0 means disable. Default = 0. Ports can
only be enabled by the Host Controller as a part of the reset and enable sequence. Software
cannot enable a port by writing logic 1 to this field. The Host Controller will only set this bit
when the reset sequence determines that the attached device is a high-speed device. Ports
can be disabled by either a fault condition or by host software. The bit status does not change
until the port state has changed. There may be a delay in disabling or enabling a port because
of other Host Controller and bus events. When the port is disabled, downstream propagation of
data is blocked on this port, except for reset.
Connect Status Change: Logic 1 means change in ECCS. Logic 0 means no change.
Default = 0. This bit indicates a change has occurred in the ECCS of the port. The Host
Controller sets this bit for all changes to the port device connect status, even if the system
software has not cleared an existing connect status change. For example, the insertion status
changes two times before the system software has cleared the changed condition, hub
hardware will be setting an already-set bit, that is, the bit will remain set. Software clears this bit
by writing logic 1 to it.
Current Connect Status: Logic 1 indicates a device is present on the port. Logic 0 indicates
no device is present. Default = 0. This value reflects the current state of the port and may not
directly correspond to the event that caused the ECSC bit to be set.
[1]
[1]
Rev. 02 — 1 March 2007
Port Number
[1]
1) where Port Number is 1, 2
…continued
HS USB PCI Host Controller
[1]
© NXP B.V. 2007. All rights reserved.
ISP1562
73 of 93