M66596FP datasheet(74/131 Pages) RENESAS

74 / 131 page

M66596FP/WG

rev .1.00

2006.3.14

page 74 of 127

The controller may carry out writing to the PID bit, depending on the results of the transaction.

(1)

Host mode

(a) NAK setting

In the following cases, it becomes "PID=NAK" and issue of a token is stopped automatically.

- When a peripheral device ignores the token other than isochronous transfer.

- When the packet which is not normal is received during transmission other than isocronous transfer.

- When a short packet is received, if the SHTNAK bit of the PIPECFG register has been set to “1” for bulk

transfer,

- When the transaction counter has ended, if the SHTNAK bit of the PIPECFG register has been set to “1” for

bulk transfers.

(b) BUF setting

The controller doesn’t set up “PID=BUF”.

(c)

STALL setting :

In the following cases, it becomes "PID=STALL" and issue of a token is stopped automatically.

- When the “STALL” packet from a peripheral device is received..

- When an error has been detected in a received data packet indicating that the data size

exceeds the maximum packet size

(2)

Peripheral mode

(a) NAK setting

- When the SETUP token is received normally (DCP only)

- When a short packet is received, if the SHTNAK bit of the PIPECFG register has been set to “1” for bulk

transfers

- When the transaction counter has ended, if the SHTNAK bit of the PIPECFG register has been set to “1” for

bulk transfers

(b) STALL setting :

- When an error has been detected in a received data packet indicating that the data size

exceeds the maximum packet size

- When a control transfer stage transition error has been detected

3.3.5 Registers that should not be set in the USB communication enabled (“PID=BUF”) state

ISEL

bit of the CFIFOSEL

TGL

and SCLR bits of the CFIFOSIE

DCLRM

, TRENB, TRCLR, and DEZPM bits of the DxFIFOSEL register

TRNCNT

bit of the DxFIFOTRN register

The various bits of the DCPCFG

and DCPMAXP registers

The various bits of the DCPCTR

The various bits of the PIPECFG

, PIPEBUF, and PIPEMAXP registers

The various bits of the PIPEPERI

and PIPExCTR registers

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