HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 907
HD6417320
Manufacturer Part Number
HD6417320
Description
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417320.pdf
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25.4.4
EP1 has two 64-byte FIFOs, but the user can perform data reception and receive data reads
without being aware of this dual-FIFO configuration.
When one FIFO is full after reception is completed, the IFR0/EP1 FULL bit is set. After the first
receive operation into one of the FIFOs when both FIFOs are empty, the other FIFO is empty, and
so the next packet can be received immediately. When both FIFOs are full, NACK is returned to
the host automatically. When reading of the receive data is completed following data reception, 1
is written to the TRG/EP1 RDFN bit. This operation empties the FIFO that has just been read, and
makes it ready to receive the next packet.
EP1 Bulk-Out Transfer (Dual FIFOs)
Clear EP1 FIFO full status
Data reception from host
Set EP1 FIFO full status
(IFR0/EP1 FULL = 1)
(IFR0/EP1 FULL = 0)
OUT token reception
EP1 FIFOs empty?
USB function
in EP1 FIFO?
Figure 25.11
Space
Both
Yes
Yes
ACK
NAK
EP1 Bulk-Out Transfer Operation
No
No
Interrupt request
Interrupt request
Section 25
Rev. 3.00 Jan. 18, 2008 Page 845 of 1458
Read EP1 receive data
data register (EPDR1)
(TRG/EP1 RDFN = 1)
size register (EPSZ1)
Read data from EP1
Write 1 to EP1 read
Application
complete bit
USB Function Controller (USBF)
REJ09B0033-0300
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