SH7721 datasheet(895/1524 Pages) RENESAS

895 / 1524 page

Section 25

USB Function Controller (USBF)

Rev. 3.00 Jan. 18, 2008 Page 833 of 1458

REJ09B0033-0300

• EPIRN3:

Bit

Bit Name

Initial value

R/W

Description

7 to 0

D7 to D0

Undefined

Reserved

The write value should always be 0.

• EPIRN4:

Bit

Bit Name

Initial value

R/W

Description

7 to 0

D7 to D0

Undefined

Endpoint FIFO Number

Settable range: 0 to 5

An endpoint number is an endpoint number used by the USB host. The endpoint FIFO number

corresponds to the endpoint number which is described in this manual. When each endpoint

number and endpoint FIFO number corresponds to each other, transfer can be performed between

the USB host and the endpoint FIFO. Note that the setting values are limited as described below.

• Since each endpoint FIFO is optimized by a dedicated hardware corresponding to each transfer

method, transfer direction, and maximum packet size, set the endpoint FIFO with a transfer

method, transfer direction, and maximum packet size shown in the table below.

Example: Endpoint FIFO number 1 cannot be set as other than bulk transfer, OUT, and

maximum packet size (64 bytes). Although endpoint FIFO number 4 cannot be set as other

than isochronous transfer and OUT, maximum packet size can be set in the range of 0 to 64

bytes.

• Endpoint 0 and endpoint FIFO number 0 must correspond.

• The maximum packet size of endpoint FIFO number 0 can be set to 8 bytes only.

• The setting value of endpoint FIFO number 0 can be set to the maximum packet size only and

the rest data is all 0.

• The maximum packet size of endpoint FIFO numbers 1 and 2 can be set to 64 only.

• The maximum packet size of endpoint FIFO numbers 3 can be set to 8 only.

• The maximum packet size of endpoint FIFO numbers 4 and 5 can be set in the range of 0 to

64.

• When the isochronous transfer is set, Alternate can be used in the range of 0 and 1 for the same

endpoint. Be sure to allocate the Alternate to the same endpoint FIFO number.

• Endpoint information can be set up to 10 in maximum.

• Endpoint information of 10 pieces must be written.

• All information of endpoints which are not used must be written as 0.

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