Samsung S3C6400X User Manual page 768

S3C6400X RISC MICROPROCESSOR
Interrupt Ports
Interrupts are requested or cleared if the Modem chip or the AP accesses the interrupt-port (predefined special
addresses). That special addresses can be configured by the AP and the default address-map is shown in the
Table23-1.
Interrupt Address
To AP 0x1FFE
To
0x1FFC bit15-0
Modem
Note 1) This address is default value. It can be set to the other value by the SFR.
Note 2) Modem interface block has one Interrupt Clear Registers; MSMINTCLR. Level type interrupt request is generated by modem
interface block and is sustained until the AP clears the interrupt clear registers by writing any value to the registers.
Modem chip or AP(S3C6400X) can read the data that indicates what event happens – data transfer requested,
data transfer done, special command issued, etc. - from interrupt port address. That data format should be
defined for communication between the modem chip and AP.
Table 23-1 Interrupt request and clear conditions
1)
An Interrupt is requested, when
Modem chip writes
AP writes (at least one bit "High")
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
MODEM INTERFACE
The Interrupt is cleared, when
AP writes to MSMINTCLR register in
2)
MSM interface block
Modem chip writes High to the bits
23-3