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Preliminary
S3C2451X RISC MICROPROCESSOR
SYSTEM CONTROLLER
2-37
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
USB PHY CONTROL REGISTER (PHYCTRL)
Register Address
R/W
Description
Reset
Value
PHYCTRL
0x4C00_0080
R/W
USB2.0 PHY Control Register
0x0000_0000
PHYCTRL Bit
Description Initial
State
RESERVED [31:5]
-
0
CLK_SEL [4:3]
Reference
Clock Frequency Select
00 = 48MHz
01 = Reserved
10 = 12MHz
11 = 24MHz
2’b00
EXT_CLK
[2]
Clock Select for XO Block
0 = Crystal
1 = Oscillator
0
INT_PLL_SEL
[1]
Host 1.1 uses Internal PLL Clock (48MHz)
0 = System PLL Clock (USBHOSTCLK should be 48MHz and
The CLK_SEL[1:0] bus must be set to 2’b00)
1 = USB Internal PLL Clock
0
DOWNSTREAM_
PORT
[0]
Downstream Port Select
0 = Device (Function) Mode
1 = Host Mode
0