ISP1160BMSLASH01 datasheet(39/88 Pages) PHILIPS

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Philips Semiconductors

ISP1160

Embedded USB Host Controller

Product data

Rev. 04 — 04 July 2003

39 of 88

9397 750 11371

10.1.3

HcCommandStatus register (R/W: 02H/82H)

The HcCommandStatus register is used by the HC to receive commands issued by

the HCD, and it also reﬂects the HC’s current status. To the HCD, it appears to be a

‘write to set’ register. The HC must ensure that bits written as logic 1 become set in

the register while bits written as logic 0 remain unchanged in the register. The HCD

may issue multiple distinct commands to the HC without concern for corrupting

previously issued commands. The HCD has normal read access to all bits.

The SchedulingOverrunCount ﬁeld indicates the number of frames with which the HC

has detected the scheduling overrun error. This occurs when the Periodic list does

not complete before EOF. When a scheduling overrun error is detected, the HC

increments the counter and sets the SchedulingOverrun ﬁeld in the HcInterruptStatus

Code (Hex): 02 — read

Table 11:

HcControl register: bit description

Bit

Symbol

Description

31 to 11

reserved

RWE

RemoteWakeupEnable: This bit is used by the HCD to enable or

disable the remote wake-up feature upon the detection of

upstream resume signaling. When this bit is set and the

ResumeDetected bit in HcInterruptStatus is set, a remote wake-up

is signaled to the host system. Setting this bit has no impact on the

generation of hardware interrupt.

9RWC

RemoteWakeupConnected: This bit indicates whether the HC

supports remote wake-up signaling. If remote wake-up is

supported and used by the system, it is the responsibility of

system ﬁrmware to set this bit during POST. The HC clears the bit

upon a hardware reset but does not alter it upon a software reset.

Remote wake-up signaling of the host system is host-bus-speciﬁc

and is not described in this speciﬁcation.

reserved

7 to 6

HCFS

HostControllerFunctionalState for USB:

00B — USBReset

01B — USBResume

10B — USBOperational

11B — USBSuspend

A transition to USBOperational from another state causes

start-of-frame (SOF) generation to begin 1 ms later. The HCD may

determine whether the HC has begun sending SOFs by reading

the StartofFrame ﬁeld of HcInterruptStatus.

This ﬁeld can be changed by the HC only when in the

USBSuspend state. The HC can move from the USBSuspend

state to the USBResume state after detecting the resume signaling

from a downstream port.

The HC enters USBReset after a software reset and a hardware

reset. The latter also resets the Root Hub and asserts subsequent

reset signaling to downstream ports.

5 to 0

reserved

ISP1160BM/01 Datasheet(PDF) 39 Page - NXP Semiconductors

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