M66596FP datasheet(92/131 Pages) RENESAS

92 / 131 page

M66596FP/WG

rev .1.00

2006.3.14

page 92 of 127

3.9.1

Error detection with isochronous transfers

The controller has a function for detecting the error information noted below, so that when errors occur in

isochronous transfers, software can control them. Table 3.24 and Table 3.25 show the order in which errors are

confirmed, and the interrupts that are generated.

(1)

PID errors

If the PID is illegal

(2)

CRC errors and bit stuffing errors

If an error occurs in the CRC of the packet being received, or the bit stuffing is illegal

(3)

Maximum packet size exceeded

The maximum packet size exceeded the set value.

(4)

Overrun and underrun errors

(a) In the Host mode

- When a buffer memory is not empty at the time of transmission of the IN direction

- When there is no transmitting data in a buffer memory at the time of transmission of the OUT

direction

(b) In the Peripheral mode

- When a buffer memory is not empty at the time of the OUT token is received.

- When there is no transmitting data in a buffer memory at the time of the IN token is received.

(5)

Interval errors

In the Peripheral mode, The following cases are interval error.

- During an isochronous IN transfer, the In token could not be received during the interval frame.

- During an isochronous OUT transfer, the OUT token is received out of the interval frame.

Table 3.24 Error detection when a token is received

Detection

priority

order

Error

Generated interrupt and status

PID errors

No interrupt generated (ignored)

CRC error and bit stuffing errors

No interrupt generated (ignored)

Overrun and underrun errors

NRDY interrupt, OVRN bit set

In the Host mode, the controller does

not transmit a token.

In the Peripheral mode, the controller

transmits a Zero-Length to IN token.

The controller does not receive a data

packet to an OUT token.

Interval errors

NRDY interrupt is generated in the

Peripheral mode.

Table 3.25 Error detection when a data packet is received

Detection

priority

order

Error

Generated interrupt and status

PID errors

No interrupt generated (ignored)

CRC error and bit stuffing errors

NRDY interrupt generated

CRCE bit set

Maximum packet size exceeded error

BEMP interrupt

PID set to ”STALL”

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