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ISP1160

Embedded Universal Serial Bus Host Controller

Philips Electronics 

Philips Semiconductors

ISP1160

Embedded USB Host Controller

Table 5: Philips Transfer Descriptor (PTD): bit description

Symbol

Access

Description

ActualBytes[9:0]

R/W Contains the number of bytes that were transferred for this PTD.

CompletionCode[3:0] R/W 0000 NoError

General TD or isochronous data packet processing

completed with no detected errors.

0001 CRC

Last data packet from endpoint contained a CRC error.

0010 BitStuffing

Last data packet from endpoint contained a bit stuffing

violation.

0011 DataToggleMismatch Last packet from endpoint had data toggle PID that did

not match the expected value.

0100 Stall

TD was moved to the Done queue because the

endpoint returned a STALL PID.

0101 DeviceNotResponding Device did not respond to token (IN) or did not provide a

handshake (OUT).

0110 PIDCheckFailure

Check bits on PID from endpoint failed on data PID (IN)

or handshake (OUT).

0111 UnexpectedPID

Received PID was not valid when encountered or PID

value is not defined.

1000 DataOverrun

The amount of data returned by the endpoint exceeded

either the size of the maximum data packet allowed

from the endpoint (found in the MaximumPacketSize

field of endpoint descriptor) or the remaining buffer size.

1001 DataUnderrun

The endpoint returned is less than MaximumPacketSize

and that amount was not sufficient to fill the specified

buffer.

1010 reserved

-

1011 reserved

-

1100 BufferOverrun

During an IN, the HC received data from an endpoint

faster than it could be written to system memory.

1101 BufferUnderrun

During an OUT, the HC could not retrieve data from the

system memory fast enough to keep up with the USB

data rate.

Active

R/W Set to logic 1 by firmware to enable the execution of transactions by the HC. When the

transaction associated with this descriptor is completed, the HC sets this bit to logic 0,

indicating that a transaction for this element will not be executed when it is next

encountered in the schedule.

Toggle

R/W Used to generate or compare the data PID value (DATA0 or DATA1). It is updated after

each successful transmission or reception of a data packet.

MaxPacketSize[9:0] R

The maximum number of bytes that can be sent to or received from the endpoint in a

single data packet.

EndpointNumber[3:0] R

USB address of the endpoint within the function.

Last

R

Last PTD of a list (ITL or ATL). Logic 1 indicates that the PTD is the last PTD.

Speed

R

Speed of the endpoint:

TotalBytes[9:0]

0 — full speed

1 — low speed

R

Specifies the total number of bytes to be transferred with this data structure. For Bulk and

Control only, this can be greater than MaximumPacketSize.

9397 750 11371

Product data

Rev. 04 — 04 July 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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