Preliminary
S3C2451X RISC MICROPROCESSOR
I/O PORTS
11-45
DSCn (Drive Strength Control)
Control the Memory I/O drive strength
Register Address
R/W
Description
Reset
Value
DSC0 0x560000c0
R/W
Strength
control register 0
0x2aaa_aaaa
DSC1 0x560000c4
R/W
Strength
control register 1
0xaaa_aaaa
DSC2 0x560000c8
R/W
Strength
control register 2
0xaa8_aaaa
DSC3 0x56000110
R/W
Strength
control register 3
0x2aa
DSC0 Bit
Description
Reset
Value
Reserved [31:30]
Reserved
0x0
DSC_CF
[29:28]
nWE_CF, nOE_CF Drive strength
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10
DSC_nRBE [27:26]
10
DSC_nROE [25:24]
10
DSC_nRWE [23:22]
nRBE, nROE, nRWE Drive strength
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10
DSC_nRCS5 [21:20]
10
DSC_nRCS4 [19:18]
10
DSC_nRCS3 [17:16]
10
DSC_nRCS2 [15:14]
10
DSC_nRCS1 [13:12]
10
DSC_nRCS0 [11:10]
nRCS5 ~ nRCS0 Address Bus Drive strength.
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10
DSC_RADDRH [9:8] ROM
Address
Bus[25:16] Drive strength.
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10
DSC_RADDRL [7:6] ROM
Address
Bus[15:1] Drive strength.
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10
DSC_RADDR0 [5:4] ROM
Address Bus[0] Drive strength.
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10
DSC_RDATA1 [3:2]
ROM
DATA[15:8] I/O Drive strength.
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10
DSC_RDATA0
[1:0]
ROM DATA[7:0] I/O Drive strength.
00: 5.2mA
01: 10.5mA
10: 15.7mA
11:
21.0mA
10