ISP1562BE STEricsson, ISP1562BE Datasheet - Page 73

• Manufacturer Part Number: ISP1562BE
• Manufacturer: STEricsson

Specifications of ISP1562BE

• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Package Type: LQFP
• Rad Hardened: No
• Lead Free Status / Rohs Status: Supplier Unconfirmed

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
ISP1562_3
Product data sheet
Bit
8
7
6
5
4
Symbol
PR
SUSP
FPR
OCC
OCA
Description
Port Reset: Logic 1 means the port is in reset. Logic 0 means the port is not in reset. Default =
0. When software sets this bit from logic 0, the bus reset sequence as defined in Universal
Serial Bus Specification Rev. 2.0 is started. Software clears this bit to terminate the bus reset
sequence. Software must hold this bit at logic 1 until the reset sequence, as specified in
Universal Serial Bus Specification Rev. 2.0 , is completed.
Remark: When software sets this bit, it must also clear the Port Enable bit.
Remark: When software clears this bit, there may be a delay before the bit status changes to
logic 0 because it will not read logic 0 until the reset is completed. If the port is in high-speed
mode after reset is completed, the host controller will automatically enable this port; it can set
the Port Enable bit. A host controller must terminate the reset and stabilize the state of the port
within 2 ms of software changing this bit from logic 1 to logic 0. For example, if the port detects
that the attached device is high-speed during a reset, then the host controller must enable the
port within 2 ms of software clearing this bit.
HCH (bit 12) in the USBSTS register must be logic 0 before software attempts to use this bit.
The host controller may hold Port Reset asserted when the HCH bit is set.
Suspend: Default = 0. Logic 1 means the port is in the suspend state. Logic 0 means the port
is not suspended. The PED (Port Enabled) bit and this bit define the port states as follows:
PED = 0 and SUSP = X — Port is disabled.
PED = 1 and SUSP = 0 — Port is enabled.
PED = 1 and SUSP = 1 — Port is suspended.
When in the suspend state, downstream propagation of data is blocked on this port, except for
the port reset. If a transaction was in progress when this bit was set, blocking occurs at the end
of the current transaction. In the suspend state, the port is sensitive to resume detection. The
bit status does not change until the port is suspended and there may be a delay in suspending
a port, if there is a transaction currently in progress on the USB. Attempts to clear this bit are
ignored by the host controller. The host controller will unconditionally set this bit to logic 0
when:
If the host software sets this bit when the Port Enabled bit is logic 0, the results are undefined.
Force Port Resume: Logic 1 means resume detected or driven on the port. Logic 0 means no
resume (K-state) detected or driven on the port. Default = 0. Software sets this bit to drive the
resume signaling. The host controller sets this bit if a J-to-K transition is detected, while the port
is in the suspend state. When this bit changes to logic 1 because a J-to-K transition is detected,
PCD (bit 2) in the USBSTS register is also set to logic 1. If software sets this bit to logic 1, the
host controller must not set the PCD bit. When the EHCI controller owns the port, the resume
sequence follows the sequence specified in Universal Serial Bus Specification Rev. 2.0 . The
resume signaling (full-speed ‘K’) is driven on the port as long as this bit remains set. Software
must time the resume and clear this bit after the correct amount of time has elapsed. Clearing
this bit causes the port to return to high-speed mode, forcing the bus below the port into a
high-speed idle. This bit will remain at logic 1, until the port has switched to the high-speed idle.
The host controller must complete this transition within 2 ms of software clearing this bit.
Overcurrent Change: Default = 0. This bit is set to logic 1 when there is a change in
overcurrent active. Software clears this bit by setting it to logic 1.
Overcurrent Active: Default = 0. If set to logic 1, this port has an overcurrent condition. If set to
logic 0, this port does not have an overcurrent condition. This bit will automatically change from
logic 1 to logic 0 when the overcurrent condition is removed.
•
•
Software changes the FPR (Force Port Resume) bit to logic 0.
Software changes the PR (Port Reset) bit to logic 1.
Rev. 03 — 14 November 2008
Port Number
1) where Port Number is 1, 2
…continued
HS USB PCI host controller
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© NXP B.V. 2008. All rights reserved.
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