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DSP56305 User’s Manual
MOTOROLA
Bootstrap Code
; with single-strob pin configuration (RD/WR,DS).
; MD:MC:MB:MA=1111 - Host UB
UB1HOSTLD
bset #13,x1 ; HDSM=1 (Double-strob pin mode disabled)
;========================================================================
; This is the routine that loads from the Host Interface in UB (UNIVERSAL) mode,
; with double-strobe pin configuration (RD,WR).
; MD:MC:MB:MA=1110 - Host UB
UB2HOSTLD
movep x1,X:M_DCTR ; Configure HI32 in UB mode Single or Double strobe
do #6,_LOOP0 ; read # of words and start address
jclr #2,X:M_DSR,* ; Wait for SRRQ to go high (i.e. data ready)
movep X:M_DRXR,a2 ;
asr #8,a,a ; Shift 8 bit data into A1
_LOOP0 ;
move a1,r0 ; starting address for load
move a1,r1 ; save it in r1
; a0 holds the number of words
; Download P memory through UB
do a0,_LOOP1 ; Load instruction words
do #3,_LOOP2 ; for each byte
_LBLA
jset #2,X:M_DSR,_LBLB ; Wait for SRRQ to go high (i.e. data ready)
jclr #3,X:M_DSR,_LBLA ; If HF0=1, stop loading new data.
enddo ; Must terminate the do loop
bra <TERMINATE ; Terminate loop (enddo) and finish
_LBLB
movep X:M_DRXR,a2 ; Store 16-bit data in accumulator
asr #8,a,a ; Shift 8 bit data into A1
_LOOP2 ; and go get another 24-bit word.
movem a1,p:(r0)+ ; Store 24-bit data in P mem
nop ; movem cannot be at LA.
_LOOP1 ; and go get another 24-bit word.
bra <FINISH ; finish bootstrap
;========================================================================
IHOSTLD
jclr #0,omr,PCIHOSTLD ; If MD:MC:MB:MA=1100, go load from PCI HOST
;========================================================================
; This routine loads from the Host Interface in ISA (UNIVERSAL) mode.
; MD:MC:MB:MA=1101 - Host ISA
; Using self configuration mode, the base address in CBMA is written with
; $2f which corresponds to an ISA HTXR address of $2fe (Serial Port 2 Modem
; Status read only register).
ISAHOSTLD
Содержание DSP56305
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Страница 146: ...5 2 DSP56305 User s Manual MOTOROLA General Purpose I O 5 1 Introduction 5 3 5 2 Programming Model 5 3 ...
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Страница 347: ...MOTOROLA DSP56305 User s Manual 9 1 SECTION 9 TIMER EVENT COUNTER ...
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Страница 555: ...MOTOROLA DSP56305 User s Manual A 1 APPENDIX A BOOTSTRAP CODE ...
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