R8A66597BG RENESAS [Renesas Technology Corp], R8A66597BG Datasheet - Page 121

• Manufacturer Part Number: R8A66597BG
• Description: ASSP (USB2.0 2 Port Host/1 Port Peripheral Controller)
• Manufacturer: RENESAS [Renesas Technology Corp]

R8A66597FP/DFP/BG
3.2.4
R e v 1 . 0 1
NRDY Interrupt
The NRDY interrupt is generated when either the Host or Peripheral function is selected. The conditions under which
the NRDY interrupt is requested are shown in 2.11.22.
Figure 3.8 shows the diagram of the NRDY interrupt generation timing for the Peripheral Controller function.
O c t 1 7 , 2 0 0 8
USB Bus
USB Bus
Buffer memory status
NRDY Interrupt
(Change in
corresponding
PIPENRDY bit)
(2) Data Receive; OUT Token Receive Example (single buffer setting)
NRDY Interrupt
(Change
corresponding
PIPENRDY bit)
(CRC bit, etc)
Buffer memory status
*1) Handshake is not existi ng i n isochro nous transfers.
*2) PIPENRDY bit is o nly changed to “1” whe n target pipe PID bit is set to “1”.
*3) CRC bit and OVRUN bit a re changed o nly when target pipe transfer type is iso chro nous.
(1) Data Send Example (single buffer setting)
Buffer memory status
(3) Data Receive; PING Token Receive Example (single buffer setting)
NRDY Interrupt
(Change in
corresponding
PIPENRDY bit)
USB Bus
Figure 3.8 NRDY Interrupt Generation Timing for Peripheral Controller Function
Packet sent by Host
Packet sent by Peripheral
*3
*2
*2
*2
p a g e 1 2 1 o f 1 8 3
in
Read-enabled status (no receive-enabled area)
Write-enabled status (no send-enabled data)
Read-enabled status (no receive-enabled area)
OUT Token Packet
IN Token Packet
PING Packet
NAK Handshake
NAK Handshake
Data Packet
( *1
NAK Handshake
(*1