M66596FP datasheet(90/131 Pages) RENESAS

90 / 131 page

M66596FP/WG

rev .1.00

2006.3.14

page 90 of 127

3.7.2

NYET handshake control in the Peripheral mode

Table 3.23 shows the NYET handshake responses of the controller. The NYET response of the controller is made in

conformance with the conditions noted below. When a short packet is received, however, the response will be an ACK

response rather than a NYET packet response. The same applies to data stages of control write transfers.

Table 3.23 NYET handshake responses

Value set for PID

bit

Buffer memory

state

Token

Response

Note

NAK/STALL

SETUP

ACK

IN/OUT/PING

NAK/STALL

BUF

SETUP

ACK

RCV-BRDY*1

OUT/PING

ACK

If an OUT token is received, a data packet is

received.

RCV-BRDY*2

OUT

NYET

Notification of whether a data packet is received

or cannot be received

RCV-BRDY*2

OUT (Short)

ACK

Notification of whether a data packet is received

or cannot be received

RCV-BRDY*2

PING

ACK

Notification that reception is not possible

RCV-NRDY

OUT / PING

NAK

Notification that reception is not possible

TRN-BRDY

DATA0 / 1

Data packet transmission

TRN-NRDY

NAK

TRN-NRDY

*1) Buffer memory is state is as following;

RCV-BRDY*1: When an OUT/PING token is received, there is space in the buffer memory for two or more

packets.

RCV-BRDY*2: When an OUT token is received, there is only enough space in the buffer memory for one packet.

RCV-NRDY: When a PING token is received, there is no space in the buffer memory.

TRN-BRDY: When an IN token is received, there is data to be sent in the buffer memory.

TRN-NRDY: When an IN token is received, there is no data to be sent in the buffer memory.

3.8 Interrupt transfers(PIPE6-7)

In the Peripheral mode, the controller carries out interrupt transfers in accordance with the timing controlled by

the host controller. For interrupt transfers, PING packets are ignored (no response is sent), and the ACK, NAK and

STALL responses are carried out without an NYET handshake response being made.

In the Host mode, this controller can set up the transmitting timing of a token by interval counter. This controller

does not transmit a PING token at the time of interruption out transmission. When NYET from peripheral is

received, this controller carries out the same operation as ACK reception.

The controller does not support High-Bandwidth transfers of interrupt transfers.

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