R1610C RDC Semiconductor, R1610C Datasheet - Page 33

• Manufacturer Part Number: R1610C
• Description: High Performance 16 Bits MCU Integrated One 10/100M Mac Controller - 3.3V Operating Voltage/2.5V Core Voltage
• Manufacturer: RDC Semiconductor

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Data Sheet
Final Version 1.5
October 27, 2003
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D
D
(b) DMA Operation Mode
(c) Shadow Operation Mode
This mode is provided to move codes from the Flash/ROM to the SDRAM at the same address. Set these
two bits of SHADMOD [1:0], in Bus Control Register, to 2’b01, followed by a DMA instruction to tell the
CPU to do DMA transfer. The DMA transfer is a read from the Flash/ROM followed by a write to the
SDRAM at the same address.
The SDRAM space is from 0 to 1M Bytes.
UCS_n is used for accessing the Flash/ROEM and its space is from 512K Bytes to 1M Bytes.
Under this mode, the CPU fetches code from the SDRAM instead of from the Flash/ROM. Setting
SHADMOD [1:0], in Bus Control Register, to 2’b10 or 2’b11 will enable shadow operation mode.
The SDRAM space is from 0 to 1M Bytes.
UCS_n is not used.
C
C
®
®
R
R
I
I
S
S
C
C
D
D
S
S
P
P
C
C
o
o
m
m
UCS
m
m
UCS
u
u
n
n
i
i
FFFFFh
c
80000h
c
a
a
FFFFFh
80000h
t
t
i
i
o
o
n
n
Flash
Flash
DMA 80000h
FFFFFh
00000h
FFFFFh
00000h
Fast Ethernet RISC Processor
SDRAM
SDRAM
R1610C
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