25 isochronous receive interrupt event register – Texas Instruments Dual/Single Socket CardBus and UntraMedia Controller PCI7621 User Manual
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8.25 Isochronous Receive Interrupt Event Register
The isochronous receive interrupt event set/clear register reflects the interrupt state of the isochronous receive
contexts. An interrupt is generated on behalf of an isochronous receive context if an INPUT_* command completes
and its interrupt bits are set to 1. Upon determining that the isochRx (bit 7) interrupt in the interrupt event register at
OHCI offset 80h/84h (see Section 8.21) has occurred, 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 8−18 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 receive 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 receive interrupt event
Type
R
R
R
R
R
R
R
R
R
R
R
R
RSC
RSC
RSC
RSC
Default
0
0
0
0
0
0
0
0
0
0
0
0
X
X
X
X
Register:
Isochronous receive interrupt event
Offset:
A0h
set register
A4h
clear register [returns the contents of isochronous receive interrupt event register
bit-wise ANDed with the isochronous receive mask register when read]
Type:
Read/Set/Clear, Read-only
Default:
0000 000Xh
Table 8−18. Isochronous Receive Interrupt Event Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
31−4
RSVD
R
Reserved. Bits 31−4 return 0s when read.
3
isoRecv3
RSC
Isochronous receive channel 3 caused the interrupt event register bit 7 (isochRx) interrupt.
2
isoRecv2
RSC
Isochronous receive channel 2 caused the interrupt event register bit 7 (isochRx) interrupt.
1
isoRecv1
RSC
Isochronous receive channel 1 caused the interrupt event register bit 7 (isochRx) interrupt.
0
isoRecv0
RSC
Isochronous receive channel 0 caused the interrupt event register bit 7 (isochRx) interrupt.