Mprxe

Registers			www.ti.com
	Table 87. Receive Interval Register (Host mode only) (HOST_RXINTERVAL) Field Descriptions
Bit	Field	Value	Description
7-0	POLINTVL_NAKLIMIT	0-FFh	For Interrupt and Isochronous transfers, defines the polling interval for the
			currently-selected transmit endpoint For Bulk endpoints, this register sets the number of
			frames/microframes after which the endpoint should timeout on receiving a stream of NAK
			responses. There is a transmit Interval register for each configured transmit endpoint
			(except Endpoint 0). In each case the value that is set defines a number of
			frames/microframes (High Speed transfers), as follows:

Transfer Type Speed Valid values (m) Interpretation

Interrupt Low Speed or Full Speed 1 - 255 Polling interval is m frames

High Speed 1 - 16 Polling interval is 2(—1)microframes

Isochronous Full Speed or High Speed 1 - 16 Polling interval is 2(—1)frames/microframes

Bulk Full Speed or High Speed 2 - 16 NAK Limit is 2(—1)frames/microframes

Note: A value of 0 or 1 disables the NAK timeout function

4.72 Configuration Data Register (CONFIGDATA)

The configuration data register (CONFIGDATA) is shown in Figure 87 and described in Table 88.

LEGEND: R = Read only; -n= value after reset

Bit	Field	Value	Description
7	MPRXE		Indicates automatic amalgamation of bulk packets.
		0	Automatic amalgamation of bulk packets is not selected.
		1	Automatic amalgamation of bulk packets is selected.
6	MPTXE		Indicates automatic splitting of bulk packets.
		0	Automatic splitting of bulk packets is not selected.
		1	Automatic splitting of bulk packets is selected.
5	BIGENDIAN		Indicates endian ordering.
		0	Little-endian ordering is selected.
		1	Big-endian ordering is selected.
4	HBRXE		Indicates high-bandwidth Rx ISO endpoint support.
		0	High-bandwidth Rx ISO endpoint support is not selected.
		1	High-bandwidth Rx ISO endpoint support is selected.
3	HBTXE		Indicates high-bandwidth Tx ISO endpoint support.
		0	High-bandwidth Tx ISO endpoint support is not selected.
		1	High-bandwidth Tx ISO endpoint support is selected.
2	DYNFIFO		Indicates dynamic FIFO sizing.
		0	Dynamic FIFO sizing option is not selected.
		1	Dynamic FIFO sizing option is selected.
1	SOFTCONE		Indicates soft connect/disconnect.
		0	Soft connect/disconnect option is not selected
		1	Soft connect/disconnect option is selected
0	UTMIDATAWIDTH		Indicates selected UTMI data width.
		0	8 bits
		1	16 bits
132	Universal Serial Bus (USB) Controller			SPRUGH3–November 2008
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