W83627DHG Datasheet, PDF (37/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
6.1 Configuration Sequence
Power-on Reset
Wait for key string
Any other I/O transition cycle
I/O Write to 2Eh
N
Is the data
“87h”?
Y
Check Pass key
Any other I/O transition cycle
I/O Write to 2Eh
N
Is the data
“87h”?
Y
Extended Function
Mode
To program the W83627DHG configuration registers, the following configuration procedures must be
followed in sequence:
(1). Enter the Extended Function Mode.
(2). Configure the configuration registers.
(3). Exit the Extended Function Mode.
6.1.1 Enter the Extended Function Mode
To place the chip into the Extended Function Mode, two successive writes of 0x87 must be applied to
Extended Function Enable Registers (EFERs, i.e. 2Eh or 4Eh).
6.1.2 Configure the Configuration Registers
The chip selects the Logical Device and activates the desired Logical Devices through Extended
Function Index Register (EFIR) and Extended Function Data Register (EFDR). The EFIR is located at
the same address as the EFER, and the EFDR is located at address (EFIR+1).
First, write the Logical Device Number (i.e. 0x07) to the EFIR and then write the number of the desired
Logical Device to the EFDR. If accessing the Chip (Global) Control Registers, this step is not required.
Secondly, write the address of the desired configuration register within the Logical Device to the EFIR
and then write (or read) the desired configuration register through the EFDR.
Publication Release Date: Aug, 22, 2007
-25-
Version 1.4