Samsung S3C6400X User Manual page 788

S3C6400X RISC MICROPROCESSOR
Mailbox Interface
The modem can use a 32-bit in-mailbox and a 32-bit out-mailbox for IPC (Inter Process Communication)
between the modem and the AP (S3C6400).
Mailbox basic operation
When the modem writes a 32-bit data into the in-mailbox, the CPUIF Client generates an interrupt to the AP
(S3C6400)'s CPU so that the AP (S3C6400)'s CPU will read the in-mailbox to know the requests from the
modem. The format of the in-mailbox can be freely defined by the application. The in-mailbox flag in the CPUIF
Client is automatically cleared when the AP (S3C6400)'s CPU reads the in-mailbox.
When the AP (S3C6400)'s CPU writes a 32-bit data into the out-mailbox, the CPUIF Client generates an
interrupt to the modem so that the modem will read the out-mailbox to know the requests from the AP
(S3C6400)'s CPU. The format of the out-mailbox can be freely defined by the application. The out-mailbox flag
(ie, STAT1 [0]) in the CPUIF Client is automatically cleared when the modem reads the out-mailbox.
External
Modem
CPUIF_CLIENT
- CPUIFC_STAT2[15:0]
- CPUIFC_INTE2[15:0]
IMB_FILLED
OMB_EMPTY
a 32-bit IMB
a 32-bit OMB
Modem(Host)
Interface
INTR
- STAT1[15:0]
- INTE1[15:0]
Figure 24-11. In/Out Mailbox between Modem and AP
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.
S3C6400 (AP)
IRQ
IMB_EMPTY
OMB_FILLED
Master 0
Master 1
Slave
HOST INTERFACE
Interrupt
Controller
Internal
Memory
External
Memory
Controller
24-11