M66290AGP Datasheet, PDF (18/53 Pages) Mitsubishi Electric Semiconductor – USB DEVICE CONTROLLER

MITSUBISHI <DIGITAL ASSP>
M66290AGP/FP
USB DEVICE CONTROLLER
(2-7) Interrupt Status Register 2 (Address : 1Ch)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
EPB_NRDY[5:0]
Bit
Bit
Name
15 to 6 Reserved
Name
Write/Read "0"
Function
Reset
W/R
H/W S/W USB
5 to 0
EPB_
NRDY
[5:0]
To IN/OUT token of each endpoint, if the set of response PID is not
NAK("00") and if buffer is in not ready state (receive/transmit disabled),
the bit which corresponds to the number of endpoint changes to "1".
(If the endpoint is control transfer or bulk transfer or interrupt transfer,
NAK response is executed)
Endpoint5-0 buffer
not ready
interrupt
If the endpoint is set to isochronous transfer, M66290A does not execute
NAK response, but when over-run or under-run of endpoint buffer
occurred, this bit changes to "1" at the timing of token packet receive end.
If it is set to isochronous (OUT), and if received data has error such as
CRC, this bit changes to "1" at the timing of transaction end.
W/R 00h 00h -
When "0" is written, status flag is cleared.
When "1" is written, flag is not changed.
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