CP3SP33SMSSLASHNOPB datasheet(164/407 Pages) TI1

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CP3SP33

SNOSCW5 – MAY 2013

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21.3.20 Receive Count Register (RXCOUNT)

The RXCOUNT register is a 16-bit, read-only register that indicates the current number of received data

bytes in the receive FIFO. The value changes as the contents of the FIFO change, and it is only valid

while the RXPKTRDY bit is set. At reset, this register is cleared to 0000h.

13M M12

Reserved

COUNT

COUNT The Count field indicates how many valid bytes are in the receive FIFO.

21.3.21 Transmit Transfer Type Register (TXTYPE)

The TXTYPE register is an 8-bit, read/write register that must be written with the endpoint number to be

targeted by the endpoint and the transaction protocol to use for the currently selected transmit endpoint.

There is a TXTYPE register for each endpoint (except Endpoint 0). This register is only used in Host

mode. At reset, this register is cleared to 00h.

6 5

4 3

Reserved

PROTOCOL

ENDPOINT

The Endpoint field specifies the target endpoint. Software must set this value to the

endpoint number contained in the transmit endpoint descriptor returned during device

enumeration.

PROTOCOL

The Protocol field specifies the protocol for the transmit endpoint.

00 – Reserved.

01 – Isochronous.

10 – Bulk.

11 – Interrupt.

21.3.22 Transmit Interval Register (TXINTERVAL)

The TXINTERVAL register is an 8-bit, read/write register that specifies the polling interval for the currently

selected transmit endpoint, for Interrupt and Isochronous endpoints. For Bulk endpoints, this register

specifies the number of frames after which the endpoint should timeout on receiving a stream of NAK

responses. There is a TXINTERVAL register for each endpoint (except Endpoint 0). This register is only

used in Host mode. At reset, this register is cleared to 00h.

INTERVAL/TIMEOUT

The INTERVAL/TIMEOUT field specifies a number of frames. The value is

interpreted differently depending on the transfer type.

TRANSFER TYPE

VALID VALUES (n)

NUMBER OF FRAMES

Interrupt

1-255

Iso.

1-16

2n-1

Bulk

2-16 (0 or 1 disables NAK function)

2n-1

21.3.23 Receive Transfer Type Register (RXTYPE)

The RXTYPE register is an 8-bit, read/write register that must be written with the endpoint number to be

targeted by the endpoint and the transaction protocol to use for the currently selected receive endpoint.

There is a RXTYPE register for each endpoint (except Endpoint 0). This register is only valid in Host

mode. At reset, this register is cleared to 00h.

164

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