s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 167
s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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S3C4510B
EXTERNAL I/O ACCESS CONTROL REGISTERS (EXTACON0/1)
The System Manager has four external I/O access control registers. These registers correspond to the up to four
external I/O banks that are supported by S3C4510B. Table 4-19 describes the two registers that are used to
control the timing of external I/O bank accesses.
You can control external I/O access cycles using either a specified value or an external wait signal, nEWAIT. To
obtain access cycles that are longer than those possible with a specified value, you can delay the active time of
nOE or nWBE by tCOS value setting. After nOE or nWBE active, nEWAIT should be active previously at the first
MCLK(SCLK) falling edge. In case of ROM bank 5, nRCS and nOE/nWBE signals are activated simultaneously,
that is, there is no control parameter as like tCOS. As a result, nEWAIT should be valid previously at the second
MCLK(SCLK) falling edge after nRCS active for the ROM bank 5.
EXTACON0 is used to set the access timings for external I/O banks 0 and 1. EXTACON1 is used to set the
external access timings for I/O banks 2 and 3.
EXTACON0
EXTACON1
The base pointer for external I/O bank 0 is set in the REFEXTCON register(REFEXTCON register is in
DRAM control registers part).
Registers
Offset Address
Table 4-19. External I/O Access Control Register Description
0x300C
0x3008
R/W
R/W
R/W
External I/O access timing register 0
External I/O access timing register 1
NOTE
Description
SYSTEM MANAGER
Reset Value
0x00000000
0x00000000
4-25
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