R8A66597BG RENESAS [Renesas Technology Corp], R8A66597BG Datasheet - Page 94
R8A66597BG
Manufacturer Part Number
R8A66597BG
Description
ASSP (USB2.0 2 Port Host/1 Port Peripheral Controller)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R8A66597BG.pdf
(185 pages)
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R8A66597FP/DFP/BG
2.16.14.2 When the Peripheral Controller function is selected
R e v 1 . 0 1
Figure 2.3 Correlation between (micro) frame and token reception expectation flag when "IITV=0"
Figure 2.4 Correlation between (micro) frame and token reception expectation flag when "IITV=0"
If the selected pipe transfer type is isochronous, this bit can be written to.
(1) If the selected pipe is an isochronous-OUT transfer pipe
O c t 1 7 , 2 0 0 8
When the data packet is received in the (micro) frame for each interval set in IITV bit, the controller issues a
NRDY interrupt. A NRDY interrupt is also issued when the data packet is not received due to errors such as a
CRC error or (due to reasons like the reading of data from FIFO buffer by the software (DMAC) is slow) when the
controller cannot receive the data because the FIFO buffer is full. A NRDY interrupt is issued when the SOF
packet is received.
Also, when the SOF packet is corrupted, the interrupt is issued when the SOF packet is to be received by an
internal interpolation function. However, if other than "IITV=0", a NRDY interrupt is to be issued when the SOF
packet is received for each interval after starting interval counting.
After activating the interval timer, when the PID bit is written to "NAK" by the software, the controller does not
issue the NRDY interrupt even if the SOF packet is received.
The count start conditions of the interval differ according to the setup value of the IITV bit
(a) If "IITV=0": Counting of the interval is started from the next (micro) frame after modifying the PID bit of the
selected pipe to "BUF".
(b) If other than "IITV=0": Counting of interval is started when the initial DATA packet is received normally after
modifying the PID bit of the selected pipe to "BUF".
(0: Reception expected
Interval counting start
PID bit setup value
-: Not received is
Token reception
expectation flag
expected)
(Micro)
Frame
p a g e 9 4 o f 1 8 3
(0: Reception expected
Interval counting start
PID bit setup value
-: Not received is
Token reception
expectation flag
expected)
O
S
F
(Micro)
N A K
Frame
-
O
S
F
B U F
-
S
O
F
N A K
-
O
S
F
B U F
O
U
T
0
↑
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O
F
B U F
D
A
T
A
0
-
S
O
F
B U F
-
S
O
F
B U F
O
U
T
0
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B U F
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O
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T
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