W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 152

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

Interrupt Identification Register (IIR)
Port address: 0xf000037e
Bits 0-1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
W90221X version 0.6
0
0
1
0
1
0
1
0
1
0
1
0
1
Reserved
1
Reserved
Time-out interrupt flag
Reset device, CPU reads Time-Out Register (TOR), or DFIFO being
accessed either by CPU or parallel port interface transferring
If IER[2] is set, and "Time out" is occurred during parallel port
transferring.
DMA terminal count interrupt flag
TC is deasserted by DMA controller.
If IER[3] is set, and TC is asserted by DMA controller once DMA
transfer is done.
DFIFO empty interrupt flag
CPU writes new data into DFIFO.
If IER[4] is set, and DFIFO is empty during "forward transferring".
DFIFO read threshold interrupt flag
CPU reads DFIFO such that data bytes in DFIFO are below the
threshold level.
If IER[5] is set, and data bytes received by DFIFO are exceeded the
threshold level (defined in FCR[4:5] ) during "reverse transferring".
nFault interrupt flag
CPU reads device status register (DSR).
If IER[6] is set, and a high-to-low transition is on "nFault" pin.
nAck interrupt flag
CPU reads device status register (DSR).
If DCR[3] is set, and a low-to-high transition is on "nAck" pin.
Irpt_TOUT
2
Access type: read
Irpt_TC
3
Irpt_TEMP Irpt_RDA Irpt_nFault Irpt_nAck
4
5
6
Default: 0x---
7
- 152 -