7534 Group

Rev.2.00

Jun 21, 2004

page 29 of 54

REJ03B0099-0200Z

Note on using USB mode

Handling of SE0 signal in program (at receiving)

7534 group has the border line to detect as USB RESET or EOP

(End of Packet) on the width of SE0 (Single Ended 0).

A response apposite to a state of the device is expected.

The name of the following short words which is used in table 5 shows

as follow.

•Spec: A response of the device requested by USB Specification 1.1

•SIE: Hardware operation in 7534 group

•F/W: Recommendation process in the program

Spec

SIE

F/W

Reset or resume

Reset interrupt

request

Reset interrupt

processing

Resume interrupt

processing

Table 5 Relation of the width of SE0 and the state of the device

Width of SE0

0 µ s

0.5 µ s

0.5 µ s

2.5 µ s

2.5 µ s

2.67 µ s

2.67 µ s

Spec

SIE

F/W

Spec

SIE

F/W

Spec

SIE

F/W

Spec

SIE

F/W

Idle state

TKNE = X

RSME = 0

RSTE =1

Ignore

Keep counting suspend

timer

Not acknowledge

Keep alive

Initialize suspend timer

count value

Not acknowledge

Keep alive or Reset

may determine as keep

alive and Reset interrupt

Keep alive in case of no

interrupt request

Reset processing in case

of interrupt request

Reset

Reset interrupt request

Reset processing

End of Token in transaction

TKNE = 1

RSME = 0

RSTE =1

Ignore

Not detected as EOP(in

case of no detection EOP,

SIE returns idle state as

time out. FEOPE flag is

set.)

Not acknowledge

EOP

Token interrupt request

Token interrupt processing

execute

EOP or Reset

may determine as EOP and

Reset interrupt

RxPID = 1> Token interrupt

processing

RxPID = 0> Reset interrupt

processing

Reset

Reset interrupt request

Reset processing

End of data or handshake

in transaction

TKNE = 0

RSME = 0

RSTE = 0 or 1

Ignore

Not detected as EOP(in

case of no detection EOP,

SIE returns idle state as

timeup. FEOPE flag is

set.)

Wait for the next EOP flag

EOP

Set EOP flag

After checking the set of

EOP flag, go to the next

processing

EOP or Reset

may determine as EOP

and Reset interrupt

Continue the processing

in case of no interrupt

request

Reset processing in case

of interrupt request

Reset

Reset interrupt request

Reset processing

Suspend state

TKNE = 0

RSME = 1

RSTE = 0

State of device

Bit 4 (STALL handshake control for OUT token) of this register is forcibly set by SIE under the special condition shown below.

Set condition; when PID of data packet = DATA0 (incorrect PID) in the status stage of the control read transfer.

• SYNC field at reception

Normally, the SYNC field consists of “KJKJKJKK” (8 bits). However, as for SIE of the 7534 Group, when the low-order 6 bits are “KJKJKK”, it is

determined as SYNC.