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8.23 Isochronous Transmit Interrupt Event Register
The isochronous transmit interrupt event set/clear register reflects the interrupt state of the isochronous transmit
contexts. An interrupt is generated on behalf of an isochronous transmit context if an OUTPUT_LAST* command
completes and its interrupt bits are set to 1. Upon determining that the isochTx (bit 6) interrupt has occurred in the
interrupt event register at OHCI offset 80h/84h (see Section 8.21), software can check this register to determine which
context(s) caused the interrupt. The interrupt bits are set to 1 by an asserting edge of the corresponding interrupt
signal, or by writing a 1 in the corresponding bit in the set register. The only mechanism to clear a bit in this register
is to write a 1 to the corresponding bit in the clear register. See Table 8−17 for a complete description of the register
contents.
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Name Isochronous transmit interrupt event
Type R R R R R R R R R R R R R R R R
Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name Isochronous transmit interrupt event
Type R R R R R R R R RSC RSC RSC RSC RSC RSC RSC RSC
Default 0 0 0 0 0 0 0 0 X X X X X X X X
Register: Isochronous transmit interrupt event
Offset: 90h set register
94h clear register [returns the contents of the isochronous transmit interrupt event
register bit-wise ANDed with the isochronous transmit interrupt mask register
when read]
Type: Read/Set/Clear, Read-only
Default: 0000 00XXh
Table 8−17. Isochronous Transmit Interrupt Event Register Description
BIT FIELD NAME TYPE DESCRIPTION
31−8 RSVD R Reserved. Bits 31−8 return 0s when read.
7 isoXmit7 RSC Isochronous transmit channel 7 caused the interrupt event register bit 6 (isochTx) interrupt.
6 isoXmit6 RSC Isochronous transmit channel 6 caused the interrupt event register bit 6 (isochTx) interrupt.
5 isoXmit5 RSC Isochronous transmit channel 5 caused the interrupt event register bit 6 (isochTx) interrupt.
4 isoXmit4 RSC Isochronous transmit channel 4 caused the interrupt event register bit 6 (isochTx) interrupt.
3 isoXmit3 RSC Isochronous transmit channel 3 caused the interrupt event register bit 6 (isochTx) interrupt.
2 isoXmit2 RSC Isochronous transmit channel 2 caused the interrupt event register bit 6 (isochTx) interrupt.
1 isoXmit1 RSC Isochronous transmit channel 1 caused the interrupt event register bit 6 (isochTx) interrupt.
0 isoXmit0 RSC Isochronous transmit channel 0 caused the interrupt event register bit 6 (isochTx) interrupt.