Rainbow Electronics W90N745CDG - Manual (Page 46)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 41 - Revision A2
6.2.7 Power-On Setting
After power on reset, there are eight Power-On setting pins to configure W90N745 system configuration.
POWER-ON SETTING PIN
Internal System Clock Select D15
Little/Big Endian Mode Select D14
Boot ROM/FLASH Data Bus Width D [13:12]
Default: Pull-Down in Normal Operation D9
Default: Pull-Up in Normal Operation D8
D15 pin：Internal System Clock Select
If pin D15 is pull-down, the external clock from EXTAL pin is served as internal system clock.
If pin D15 is pull-up, the PLL output clock is used as internal system clock.
D14 pin：Little/Big Endian Mode Select
If pin D14 is pull-down, the external memory format is Big Endian mode.
If pin D14 is pull-up, the external memory format is Little Endian mode.
D [13:12] ： Boot ROM/FLASH Data Bus Width
D [13:12] BUS WIDTH
Pull-down Pull-down 8-bit
Pull-down Pull-up 16-bit
Pull-up Pull-down RESERVED
Pull-up Pull-up RESERVED
6.2.8 System Manager Control Registers Map
REGISTER ADDRESS R/W DESCRIPTION RESET VALUE
PDID 0xFFF0_0000 R Product Identifier Register 0xX090_0745
ARBCON 0xFFF0_0004 R/W Arbitration Control Register 0x0000_0000
PLLCON0 0xFFF0_0008 R/W PLL Control Register 0 0x0000_2F01
CLKSEL 0xFFF0_000C R/W Clock Select Register 0x1FFF_3FX8
PLLCON1 0xFFF0_0010 R/W PLL Control Register 1 0x0001_0000
I²SCKCON 0xFFF0_0014 R/W Audio I²S Clock Control Register 0x0000_0000
IRQWAKECON 0xFFF0_0020 R/W IRQ Wakeup Control register 0x0000_0000
IRQWAKEFLAG 0xFFFF_0024 R/W IRQ wakeup Flag Register 0x0000_0000
PMCON 0xFFF0_0028 R/W Power Manager Control Register 0x0000_0000
USBTxrCON 0xFFF0_0030 R/W USB Transceiver Control Register 0x0000_0000