Motorola DSP56301 - Manual (Page 305)

DSP56301 User’s Manual A -9
; Switch to ISA mode
movep X0,X:M_DCTR ; Software personal reset
move #$010020,y1 ; width 16, offset 32
; (also used as replacment to needed NOP after sw
reset!)
movep #$3a0000,X:M_DCTR ; HM=$3 (UB)
; HIRD=1 (HIRQ_ pin - drive high enabled)
; HIRH=0 (HIRQ_ pin - handshake disabled)
; HRSP=1 (HRST pin - active low)
; HDRP=0 (HDRQ pin - active high)
; HTAP=0 (HTA pin - active high)
; HDSM=0 (Data-strob pin mode enabled)
; read the "magic sequence" 32 consecutive words with value $37
_LBLC
do #32,_LOOP3 ;
jclr #2,X:M_DSR,* ; Wait for SRRQ to go high (i.e. data ready)
movep X:M_DRXR,A1 ; Store 24-bit data into A1
and #$00ffff,A ; Mask upper byte
cmp #$37,A ; Compare the 24-bit dat to $000037
beq <_LBLD ; If dat = $37 then go back to loop
enddo ; else break the loop and retry
bra <_LBLC
_LBLD
nop
_LOOP3
; read new CBMA value ("ISA base address")
jclr #2,X:M_DSR,* ; Wait for SRRQ to go high (i.e. data ready)
movep X:M_DRXR,A1 ; Store 24-bit data into A1
; Switch to Self Configuration mode
movep X0,X:M_DCTR ; Software personal reset
movep A1,X:M_DPMC ; write to DPMC
; (also used as replacment to needed NOP after sw
reset!)
movep b1,X:M_DCTR ; Configure HI32 as Self-Config
rep #4
movep X0,X:M_DPAR ; write to DPAR (CSTR+CCMR,CCCR+CRID,CLAT,CBMA)
; Switch to ISA mode
movep X0,X:M_DCTR ; Software personal reset
move #$010010,x1 ; width 16, offset 16
; (also used as replacment to needed NOP after sw
reset!)
movep #$3a0010,x:M_DCTR ; HM=$3 (UB)
; HIRD=1 (HIRQ_ pin - drive high enabled)
; HIRH=0 (HIRQ_ pin - handshake disabled)
; HRSP=1 (HRST pin - active low)
; HDRP=0 (HDRQ pin - active high)
; HTAP=0 (HTA pin - active high)
; HDSM=0 (Double-strob pin mode enabled)
; HF4 =1 (turn on flag 4 for handshake)
jclr #2,X:M_DSR,* ; Wait for SRRQ to go high (i.e. data ready)
movep X:M_DRXR,a0 ; Store number of words
jclr #2,X:M_DSR,* ; Wait for SRRQ to go high (i.e. data ready)
movep X:M_DRXR,x0 ; Store starting address
jclr #2,X:M_DSR,* ; Wait for SRRQ to go high (i.e. data ready)