HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 635

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

20.4.7
EP3i Isochronous-In Transfer
Data transmission to host
FIFO buffer switch over
FIFO buffer switch over
Indicate the status of
Indicate the status of
Modify interrupt flag
Modify interrupt flag
(IFR0/EP3i TR, TS)
(IFR0/EP3i TR, TS)
EP3i normal transfer
EP3i normal transfer
Data transfer to host
(IFR0/EP3i TS = 1)
(IFR0/EP3i TS = 1)
In-token reception
In-token reception
Set internal flag
Set internal flag
SOF reception
SOF reception
in EP3i FIFO?
in EP3i FIFO?
FIFO B side
FIFO A side
Valid data
Valid data
Figure 20.15 Operation of Isochronous-In Transfer
Yes
Yes
USB function
No
No
0 byte data transmission
to the host
0 byte data transmission
to the host
FIFO A side
FIFO B side
EP3i transfer request
EP3i transfer request
(IFR0/EP3i TR = 1)
(IFR0/EP3i TR = 1)
Set internal flag
Set internal flag
INTN
INTN
Rev. 1.00, 02/04, page 597 of 804
data register 3i (EPDR3i)
registers H, L (TSRH, L)
registers H, L (TSRH, L)
of data in endpoint data
one packet to endpoint
packet detection flag
packet detection flag
Clear Start of Frame
Check interrupt flag
(IFR0/EP3i TR, TS)
Clear Start of Frame
Check interrupt flag
(IFR0/EP3i TR, TS)
register 3i (EPDR3i)
Read time stamp
Read time stamp
Write one packet
(IFR0/SOF = 0)
(IFR0/SOF = 0)
Write data of
Firmware
FIFO A side
FIFO B side