Misc. Register FE04h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Misc. Register FE04h
7-6
SYM53C040 DATA MANUAL VERSION 2.0
PRELIMINARY
Misc. Register FE04h
Interrupt Status (ISR)
Read/write
The individual bits of this register may be written to force an interrupt on the
corresponding bit. Clearing these bits does not clear the interrupt unless it was originally
set in this register.
Bit 7 SCSI_INT (SCSI interrupt) (read only)
A 1 in this bit indicates an interrupt pending from the SCSI block. The bit goes to zero
when the interrupt is cleared from the SCSI block.
Bit 6 2W1_INT (2-wire interface 1 interrupt) (read only)
A 1 in this bit indicates an interrupt pending from the 2-wire serial port_1 block. The
bit goes to zero when the interrupt is cleared from the 2-wire serial port_1 block.
Bit 5 2W0_INT (2-wire interface 0 interrupt) (read only)
A 1 in this bit indicates an interrupt pending from the 2-wire serial port_0 block. The
bit goes to zero when the interrupt is cleared from the 2-wire serial port_0 block.
Bit 4 DMA_INT (DMA interrupt) (read only)
A 1 in this bit indicates an interrupt pending from the DMA block. The bit goes to zero
when the interrupt is cleared from the DMA block.
Bit 3 TMR2_INT (Timer 2 interrupt) (read only)
A 1 in this bit indicates an interrupt pending from the timer2 block. The bit goes to zero
when the interrupt is cleared from the Timer2 block.
Bit 2 TMR1_INT (Timer 1 interrupt) (read only)
A 1 in this bit indicates an interrupt pending from the timer1 block. The bit goes to zero
when the interrupt is cleared from the Timer1 block.
Bit 1 EXS1_INT (8067 Port 1 interrupt or MPIO3_1 Interrupt)
A 1 in this bit indicates an interrupt pending from the SFF-8067 port 1 block or an
external interrupt received on MPIO3(1). The bit goes to zero when the interrupt is
cleared from MPIO3(1) or cleared from the SFF-8067 port 1 block.
Bit 0 EXS0_INT (8067 Port 0 interrupt or MPIO3_0 Interrupt)
A 1 in this bit indicates an interrupt pending from the SFF-8067 port 0 block or a
external interrupt received on MPIO3(0). The bit goes to zero when the interrupt is
cleared from MPIO3(0) or cleared from the SFF-8067 port 0 block.
SCSI_INT
2W1_INT
2W0_INT
DMA_INT
TMR2_INT TMR1_INT
EXS1_INT
EXS0_INT
76543210
Defaults:
00000000