Samsung SCX-5315F Service Manual page 135

3-2-5 DRAM CONTROL
1) DEVICE
TYPE NO.
CAPACITY
2) OPERATING PRINCIPLE
DRAM can either read or write. The data can be stored in the DRAM only when the power is on. It stores
data white the CPU processes data. The address to read and write the data is specified by RAS SIGNAL
and CAS SIGNAL. DRAMWE*SIGNAL is activated when writing data and DRAMOE*SIGNAL, when read-
ing. You can expand up to 64MBYTE of DRAM in this system.
Start Address ~ End Address
0x00000000 ~ 0x00FFFFFF
0x01000000 ~ 0x01FFFFFF
0x02000000 ~ 0x02FFFFFF
0x03000000 ~ 0x03FFFFFF
0x04000000 ~ 0x0FFFFFFF
0x10000000 ~ 0x1FFFFFFF
0x20000000 ~ 0x20FFFFFF
0x21000000 ~ 0x21FFFFFF
0x22000000 ~ 0x22FFFFFF
0x23000000 ~ 0x23FFFFFF
0x24000000 ~ 0x24FFFFFF
0x25000000 ~ 0x25FFFFFF
0x26000000 ~ 0x26FFFFFF
0x27000000 ~ 0x27FFFFFF
0x28000000 ~ 0x28FFFFFF
0x29800000 ~ 0x29FFFFFF
0x2A000000 ~ 0x2FFFFFFF
0x30000000 ~ 0x30FFFFFF
0x31000000 ~ 0x31FFFFFF
0x32000000 ~ 0x32FFFFFF
0x33000000 ~ 0x37FFFFFF
0x38000000 ~ 0x38FFFFFF
0x39000000 ~ 0x390003FF
0x38000500 ~ 0x3FFFFFFF
0x40000000 ~ 0x4FFFFFFF
0x50000000 ~ 0x5FFFFFFF
0x60000000 ~ 0x6FFFFFFF
0x70000000 ~ 0x7FFFFFFF
0x80000000 ~ 0xBFFFFFFF
0xC0000000 ~ 0xC00007FF
0xC0000800 ~ 0xC0FFFFFF
Samsung Electronics
K4S
16MBYTES (1M * 16BITS * 4Bank * 2)
- This Document can not be used without Samsung's authorization -
Circuit Description
Contents
ROM Bank0
ROM Bank1
ROM Bank2
ROM Bank3
Unused
Special Function Registers
I/O Bank0
I/O Bank1
I/O Bank2
I/O Bank3
I/O Bank4
I/O Bank5
DMA I/O Bank0
DMA I/O Bank1
DMA I/O Bank2
DMA I/O Bank3
Unused
RSH SRAM
HPVC SRAM
MOTOR SRAM
Unused
USB CSR & FIFO
USB PLUG DETECT
Unused
SDRAM array0 (bank 0)
SDRAM array1 (bank 1)
SDRAM array2 (bank 2)
SDRAM array3 (bank 3)
SDRAM array0~4 (Mirror)
MAC
Unused
3-15