MB86296 Datasheet, PDF (185/352 Pages) Fujitsu Component Limited. – PCI Graphics Controller Specification

FUJITSU LIMITED PRELIMINARY AND CONFIDENTIAL
13.2.1 Host interface registers
IST (Interrupt STatus)
Register
address
HostBaseAddress + 20H
Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit field name
IST
*1 Reserved Resv Reserved
Resv IST IST
R/W _{RW0 R RW0}
R0
R0W0
R0
R0 RW0 RW0
Initial value 0 0 0 0
0
0
0
0
0
0
*1 Reserved
This register indicates the current interrupt status. It shows that an interrupt request is issued when
“1” is set to this register. The interrupt status is cleared by writing “0” to this register.
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 17 and 16
Bit 26
Bit 27
Bit 28
Bit 29
Bit 30
Bit 31
CERR (Command Error Flag)
Indicates drawing command execution error interrupt
CEND (Command END)
Indicates drawing command end interrupt
VSYNC (Vertical Sync.)
Indicates vertical interrupt synchronization
FSYNC (Frame Sync.)
Indicates frame synchronization interrupt
SYNCERR (Sync. Error)
Indicates external synchronization error interrupt
REGUD (Register update)
Indicates register update interrupt
Reserved
This field is provided for testing.
Normally, the read value is “0”, but note that it may be “1” when a drawing command
error (Bit 0) has occurred.
SII (Serial Interface Interrupt)
Indicates a serial interface write/read has completed.
GI (GPIO Interrupt)
Indicates that a GPIO input has changed state (0->1 or 1->0)
BC (Burst Complete)
Indicates that a burst has completed (as part of a Burst Control Unit transfer). Note that
this bit is cleared by writing to the BST (Burst Status) register, not the IST.
TC (Transfer Complete)
Indicates that a transfer is complete (as controlled by the Burst Control Unit). Note that
this bit is cleared by writing to the BST (Burst Status) register, not the IST.
HF (HIF Fatal)
Indicates that a fatal error occurred in a PCI transfer.
AE (Address Error)
Indicates that an invalid address was specified for an access (eg. Host Interface
registers as a BCU source address).
MB86296S <Coral-PA>
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Specification Manual Rev0.1