M
ODEL
SL599 V
ERSION
V_1.0
P
REPARED BY
H/W
D
ATE
2007.04.11
S
UBJECT
T
ECHNICAL
M
ANUAL
P
AGE
18/52
SL599
T
ECHNICAL
M
ANUAL
External Interrupt
This interrupt controller also integrates an External Interrupt controller that can support up to 4 interrupt
requests coming from external sources, the EINT0~3 and 4 wake up interrupt requests. The four external
interrupts can be used for different kind of applications, mainly for event detections : detection of hand free
connection, detection of hood opening, detection of battery charger connection.
In SL599
, The External interrupts are used for Headset detection, Charger Detection and Blue Tooth
Detection.
3.6
Internal Memory Interface
System Ram
MT6227 provides one 284Kbyte size of on-chip memory modules acting as System Ram for data access with
low latency. Such a Module is composed of three high speed synchronous SRAMs with AHB Slave interface
connected to the system backbone AHB Bus. Bank 0 and bank 1 SRAMs are 128Kbyte and Bank 2 SRAM is
28Kbyte. The synchronous SRAM operates on the same clock as the AHB Bus and is organized as 32bits wide
with 4 byte-write signals capable for byte operations. Band 0 and Band 1 SRAM macros have limited repair
capability. The yield of SRAM is improbed if the defects inside it can be repaired uring testing.
System ROM
The 27Kbyte System ROM is primarily used to store software program for Factory programming.. However, due
to its advantageous low latency performance, some of the timing critical codes are also placed in System ROM.
This module is composed of high-speed VIA ROM with an AHB Slave Interface connected to a system
backbone.
3.7
External Memory Interface
MT6227 incorporates a powerful and flexible memory controller, External Memory Interface, to connect with a
variety of memory components. This controller provides one generic access scheme for FLASH memory, SRAM
and PSRAM. Up to 8 memory banks can be supported simultaneously, ban 0 ~ Bank 7, with a maximum size of
64MB each.
Since mose of the Flash Memory, SRAM and PSRAm have similar ac requirements, a generic configuration
scheme to interface them is desired. This way, the software program can treat different components by simply
specifying certain predefined parameters. All these parameters are based on cycle time of system clock.
External Memory Interface of MT6227 for Asynchronous/Synchronous components.
In SL599
, ECS0# is used for External Flash Memory and ECSL599# is used for External PSRAM.
