PRELIMINARY
MODEM INTERFACE
S3C6400X
RISC MICROPROCESSOR
23-10
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.
Software Interface and Registers
This modem interface provides a generic data-exchange method. This interface does not implement any other
complex features except for the interrupt-request/clear such as automatic FIFO managements, etc. The software
should be responsible for all other required functionalities for the data exchange between the modem chip and
the AP such as the data exchange protocol, the data buffer managements, and etc.
MSM Interface Special Function Registers
Interrupt Request to AP Register (INT2AP)
Register
address
R/W
Description
Reset Value
INT2AP
0x74108000
R/W
Interrupt request to AP register
0x00001FFE
INT2AP Bit
Description Initial
State
Reserved [31:13]
Reserved 0
INT2AP_ADR [12:0]
Modem interface requests the interrupt to AP when modem chip
writes this address. This interrupt is cleared by the interrupt
controller of AP and write access to the MSMINTCLR register.
1FFE
Interrupt Request to Modem Register (INT2MSM)
Register
Address
R/W
Description
Reset Value
INT2MSM 0x74108004 R/W
Interrupt
request to MSM modem register
0x00001FFC
INT2MSM Bit
Description Initial
State
Reserved [31:13]
Reserved 0
INT2MSM_ADR [12:0]
Modem interface (in this module) requests the interrupt to modem
chip when AP writes this address and clears the interrupt when
modem chip write 1 to the corresponding bit field.
1FFC
Note ) It is recommended that AP writes data with half-word access on the interrupt port because AP can
overwrite the data in INT2AP if there are INT2AP and INT2MSM sharing the same word.