7641 datasheet(71/385 Pages) RENESAS

71 / 385 page

Rev.2.00

Aug 28, 2006

page 54 of 113

7641 Group

REJ09B0336-0200

HARDWARE

FUNCTIONAL DESCRIPTION

[USB Endpoint 0 IN Control Register ] IN_CSR

This register contains the control and status information of the

endpoint 0. This USB FCU sets the OUT_PKT_RDY flag to “1”

upon having received a data packet in the OUT FIFO. When read-

ing its one data packet from the OUT FIFO, be sure to set this flag

to “0”.

After a SETUP token is received, the MCU is in the “decode wait

state ” until the OUT_PKT_RDY flag is cleared. If the

OUT_PKT_RDY flag is not cleared (indicating that the host re-

quest has not been successfully decoded), the USB FCU keep

returning a NAK to the host for all IN/OUT tokens.

Set the IN_PKT_RDY bit to “1” after the data packet has been

written to the IN FIFO. If this bit is set to “1” even though nothing

has been written to the IN FIFO, a “0” length data (NULL packet)

is sent to the host. The SEND_STALL bit is for sending a STALL to

the host if an unsupported request is received by the USB FCU.

This bit must be set to “1”. When the OUT_PKT_RDY flag is set to

“0” for request reception, the USB FCU transmits a STALL signal

to the Host CPU. Perform the following three processes simulta-

neously:

• Set SEND_STALL bit to “1”

• Set DATA_END bit to “1”

• Set OUT_PKT_RDY flag to “0” by setting SERVICED_OUT

_PKT_RDY bit to “1”.

Note that if “0” is written to the SEND_STALL bit before the

CLEAR_FEATURE (endpoint STALL) request has been received,

the next STALL will not be generated.

The DATA_END bit informs the USB FCU of the completion of the

process indicated in the SETUP packet. Set this bit to “1” when

the process requested in the SETUP packet is completed. (Con-

trol Read Transfer: set this bit after writing all of the requested

data to the FIFO; Control Write Transfer: set this bit to “1” after

reading all of the requested data from the FIFO.) When this bit is

“1”, the host request is ignored and a STALL is returned. After the

status phase process is completed, the USB FCU automatically

clears it to “0”.

USB endpoint 0 IN control register (address 005916)

IN_CSR

OUT_PKT_RDY flag (IN0CSR0)

0: Except the following condition (Cleared to “0” by writing “1” into

SERVICED_OUT_PKT_RDY bit)

1: End of a data packet reception

IN_PKT_RDY bit (IN0CSR1)

0: End of a data packet transmission

1: Write “1” at completion of writing a data packet into IN FIFO.

SEND_STALL bit (IN0CSR2)

0: Except the following condition

1: Transmitting STALL handshake signal

DATA_END bit (IN0CSR3)

0: Except the following condition (Cleared to “0” after completion of

status phase)

1: Write “1” at completion of writing or reading the last data packet

to/from FIFO.

FORCE_STALL flag (IN0CSR4)

0: Except the following condition

1: Protocol error detected

SETUP_END flag (IN0CSR5) (Note )

0: Except the following condition (Cleared to “0” by writing “1” into

SERVICED_SETUP_END bit)

1: Control transfer ends before the specific length of data is

transferred during the data phase.

SERVICED_OUT_PKT_RDY bit (IN0CSR6)

Writing “1” to this bit clears OUT_PKT_RDY flag to “0”.

SERVICED_SETUP_END bit (IN0CSR7)

Writing “1” to this bit clears SETUP_END flag to “0”.

Note: If this bit is set to “0”, stop accessing the FIFO to serve the previous setup transaction.

Fig. 46 Structure of USB endpoint 0 IN control register

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