Motorola DSP56305 User Manual page 560

Bootstrap Code
; Sugested 56301 to ISA connection:
;
; HA[10] <- SBHE_
; HA[9] <- SA[0]
; HA[8:3] <- SA[9:4]
; HA[2:0] <- SA[3:1]
; HD[15:0] - SD[15:0]
; HD[23:16] - Not connected
; HDBEN_ -> OE_
; HDBDR -> DIR
; HSAK_ -> IO16_
; HBS_ <- Vcc
; HAEN <- AEN
; HTA -> CHRDY
; HWR_ <- IOWC_
; HRD_ <- IORC_
; HRST <- inverted RSTDRV
;
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; If MD:MC:MB:MA=1110,
; Interface programmed to operate
; double-strobe pin configuration.
;
; The HI32 bootstrap
; number of program
; start loading the program words
; to be loaded. The number of words, the starting address
; words are received least significant
; then by the most significant byte.
;
; The program words
; contiguous PRAM
; address. After
; from the same address where loading started.
;
; The Host Interface
; Host Flag 0 (HF0) in HCTR
; loaded program from the specified starting address.
;
; The user must externally decode the port address with active
; connect the select line to HAEN; all the address lines shall be pulled down
; except for HA3, HA2 and HA1 that select the HOST Interface registers.
;
; When booting through the Host Interface it is recommended that the Host
; boot program will verify that the Host Interface is operational, by
; reading the status register (HSTR) and confirm that TRDY=1.
;
; When booting through
; HOST Processor's boot program
; ready, by reading
; or HTRQ=1.
;
A-6
; selects HI32 (base address 10011111)
; selects HI32 (base address 10011111)
; selects HI32 (base address 10011111)
; selects HTXR registers
; Data bus
; High Data Bus - Should be pulled up or down
; Output enable of transcievers
; Direction of transcievers
; 16 bit data word
; Bus Strobe disabled
; DMA cycle enable
; Channel ready
; IO/DMA write strobe
; IO/DMA read strobe
; invert ISA reset
then it loads the
in the
code expects first
words, afterwards
and then 3 bytes for each program word
will be condensed
memory locations starting at the
reading the program words, program
bootstrap load program may be stopped by setting the
register. This will start
the Host Interface, it is recommended
will
the status register
DSP56305 User's Manual
program RAM
Universal Bus
to receive 3 bytes specifying
3 bytes specifying
byte first followed by the mid and
into 24-bit words and stored in
specified starting
execution starts
execution of the
verify that the Host Interface is
(HSTR) and confirm that TRDY=1
from the Host
(UB) mode, in
the
the address to
and the program
low logic and
that the
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