Samsung S5PC110 Manual page 969

S5PC110_UM
6
MODEM INTERFACE
6.1 OVERVIEW OF MODEM INTERFACE
This chapter defines the interface between the Base-band Modem (like MSM) and the Application Processor to
facilitate data-exchange between these two devices. To facilitate data-exchange, S5PC110 include a dual-ported
SRAM buffer (on-chip). To access SRAM buffer, the Modem chip uses a typical asynchronous-SRAM interface.
The size of the SRAM buffer is 16 KB. This specification specifies a few pre-defined special addressees for the
buffer status and interrupts requests.
Modem chip writes data in the data buffer (Internal dual port SRAM buffer) and request interrupt to AP. When the
interrupt is asserted, AP reads data in data buffer, and then clears the interrupt. In the same manner, AP writes
data in the data buffer and then asserts interrupt to modem chip to notify.
( CSn , WEn , OEn ( CSn , WEn , OEn
Modem Modem Modem Modem
Modem Modem
Chip Chip Chip Chip
Chip Chip
Request ( IRQn ) Request ( IRQn )
Figure 6-1
Address Address
(ADR[12:0]) & (ADR[12:0]) &
Control signals Control signals
ADVn ) ADVn )
DATA [15:0] DATA [15:0]
Interrupt Interrupt
Interface with the Modem Chip and the MODEM I/F Block Diagram
S5PC110 S5PC110
S5PC110 S5PC110
Modem Interface module Modem Interface module Modem Interface module Modem Interface module
AP I/F (AHB Slave I/F) AP I/F (AHB Slave I/F)
Mo Mo
Internal dual port SRAM buffer Internal dual port SRAM buffer
2048 x 32 2 units (16KByte) 2048 x 32 2 units (16KByte)
MSM Modem I/F (SRAM I/F) MSM Modem I/F (SRAM I/F)
6 MODEM INTERFACE
Interrupt Request Interrupt Request
to AP to AP
Interrupt Interrupt
Controller Controller
6-1