M66596FP datasheet(89/131 Pages) RENESAS

89 / 131 page

M66596FP/WG

rev .1.00

2006.3.14

page 89 of 127

3.7 Bulk transfers (PIPE1-5)

The user can select the buffer memory specifications for bulk transfers (single / double buffer setting, or continuous

/ non-continuous transfer mode setting). The maximum size that can be set for the buffer memory is 2 KB. The buffer

memory state is controlled by the controller, with a response sent automatically for a PING packet / NYET

handshake. If “MXPS=0” has been set, the interrupt specifications are different from those of the other pipes. For

detailed information, please refer to 3.3.3 Maximum packet size setting.

3.7.1

PING packet control in the Host mode

Transmission of the PING packet of the OUT direction is automatically sent out by this controller. An initial state

is in a PING packet sending-out state as shown below. An OUT packet is sent out after receiving an ACK handshake.

If NAK or NYET is received, it will return to a PING sending-out state.

Moreover, this control is the same as a data stage and a status stage of control transfer.

1. OUT Data Transmitting Setup

2. PING Packet Transmission

3. ACK Handshake Reception

4. OUT Data Packet Transmission

5. ACK Handshake Reception

6. OUT Data Packet Transmission

7. NAK/NYET Handshake Reception

8. PING Packet Transmission

The factors from which this controller returns to transmission of a PING packet are H/W reset, S/W reset,

NYET/NAK handshake reception, the set of a sequence toggle bit, a clearance (SQSET, SQCLR), and a buffer

clearance (ACLRM) setup.

M66596FP Datasheet(PDF) 89 Page - Renesas Technology Corp