Specification Update

December 2008

16

then output reports are transmitted to a device through the Control endpoint.

Status:

No Fix.

20.

Incorrect Inter-Packet Delay on USB interface.

Problem:

The Inter-Packet Delay (IPD) between two consecutive High-Speed transmit packets

from the USB ports does not meet the USB2.0 Compliant Test Specification of minimum

88 to maximum 192 bit time. As a result, unable to pass and obtain USB2.0 compliant

logo. The IPD is the time between the end of one packet to the start of the subsequent

packet.

Speed mode.

Status:

No Fix.

21.

USB 2.0 Device Reset during Bulk Out Transaction

Problem:

In High Speed mode, the bit stuffing mechanism fails to insert a zero on the seventh bit

position followed by six consecutive ones. As a result, the USB host fails to send the

entire MaxPacketSize, and illegal packets are detected at the device (for example

MDATA and Split Token in BULK OUT transfer). The device will be reset and packets are

re-transmitted.

transmission cycles. Eventually the entire data size (or file) will successfully get to the

device. Meaning that the data could be delayed and cause a performance impact.

Status:

No Fix.

22.

RX FIFO Overflow Condition Not Properly Captured in the Rx Status

Register

Problem:

Whenever Rx FIFO overflows, it generates a rx_fifo_error signal to the Receive State

Machine (RSM). The RSM will transit to a state where it will report a status valid for NPE

to read the Rx Status register (via ECP_RdRxSts instruction). During this state, the

state machine fails to capture the rx_fifo_error signal properly and transits back to idle

state. This results in the Rx FIFO overflow condition not properly captured in the Rx

Status Register.

when TMII co-exist with HSS interface. Will not happen when the NPE runs in standard

MII mode.

Ethernet NPE measures the Rx idle time, and issues Ethernet MAC coprocessor

instruction (ECP_ClearRxError) to flush MAC Rx Engine FIFO to correct the lock-up

Table 3.

Processors

Device

Capacity

External Vendor

Note

Storage: USB2.0 Flash Disk

512 MB

Sandisk*

-

Storage: USB2.0 Flash Disk

1 GB

Kingston*

-

Storage: USB2.0 Flash Disk

128 MB

Transcend*

-

Storage: USB1.1 Flash Disk

128 MB

HP*

-

Storage: USB2.0 2.5” HDD

80 GB

Samsung*

USB enclosure: Polar

Storage: USB2.0 3.5” HDD

80 GB

Seagate*

USB enclosure: Polar

Printer: USB2.0 HP Photosmart D5160

-

Hewlett Packard*

-

Printer: USB1.1 Epson Color Photo Stylus 790

-

Epson*

-

Webcam: USB2.0 Creative Webcam Live

-

Creative*