PD6710 Datasheet, PDF (38/138 Pages) Intel Corporation – ISA-to-PC-Card (PCMCIA) Controllers

PD6710/’22 — ISA-to-PC-Card (PCMCIA) Controllers
4.3
out
dx, ax
mov
al, Index_Reg
mov
ah, user_data ;Desired data to be
out
dx, ax
;written to
;extended index 03h
;Read from Extension Control 1 register example
;Code section
mov dx, PD67XX_Index
mov al, Extended_Index
mov ah, Ext_Cntrl_1
out dx, ax
mov al, Index_Reg
out dx, al
inc dx
;al has extended
in
al, dx
;index 03h data
Power-On Setup
Following reset, the PD67XX must be configured by host software. The host software’s setup
procedure is different depending on its PC system configuration, in particular, the power supply
arrangement.
The application of the RESET signal (see Table 2 on page 20) on power-up causes initialization of
all the PD67XX register bits and fields to their reset values. Not all registers have reset values; only
registers with bits and fields specified to have reset values are initialized.
One bit, which is loaded on hardware reset from the SPKR_OUT*/C_SEL pin (see Table 1 on
page 16), is used to determine the socket to which the PD67XX will respond.
38
Datasheet