Table 10: Memory map.
In the case of D8 cycles in the indivisible-cycle
mode in range $C000 0000 - $FFFF FFFF the byte (within a longword) read
or written during 32-bits transputer accesses is selected according to
address bits A28 and A29:
$C000 0000 - $CFFF FFFF : transputer byte 0,
$D000 0000 - $DFFF FFFF : transputer byte 1,
$E000 0000 - $EFFF FFFF : transputer byte 2,
$F000 0000 - $FFFF FFFF : transputer byte 3.
If bit A28 is set in range $4000 0000 - $7FFF FFFF a single D16 cycle will
be performed. In this case the word (within a
longword) read or written is selected according to address bit A29:
$4000 0000 - $4FFF FFFF : D32 cycle,
$5000 0000 - $5FFF FFFF : D16 cycle, transputer low word,
$6000 0000 - $6FFF FFFF : D32 cycle,
$7000 0000 - $7FFF FFFF : D16 cycle, transputer high word.
[1]not available to user; used by hardware
Table 11: Memory map of the address range $8000 0000 - $8FFF FFFF
is repeated in $9000 0000 - $9FFF FFFF, $A000 0000 - $AFFF FFFF and
$B000 0000 - $BFFF FFFF with the following difference:
in the case of D8 cycles in the indivisible-cycle
mode the byte (within a longword) read or written during 32-bits transputer
accesses is selected by address bits A28 and A29:
$8000 0000 - $8FFF FFFF : transputer byte 0,
$9000 0000 - $9FFF FFFF : transputer byte 1,
$A000 0000 - $AFFF FFFF : transputer byte 2,
$B000 0000 - $BFFF FFFF : transputer byte 3.
[1]cycle NOT intended to be used [2]PFM = Postfetch Mode
Table 12: Memory map of the address range $0000 0000 - $0FFF FFFF is
repeated in $1000 0000 - $1FFF FFFF, $2000 0000 - $2FFF FFFF and
$3000 0000 - $3FFF FFFF with the following difference:
if bit A28 is set a D16 cycle will be performed;
in this case the word (within a
longword) read or written during 32-bits transputer accesses is selected
according to address bit A29:
$0000 0000 - $0FFF FFFF : D32 cycle,
$1000 0000 - $1FFF FFFF : D16 cycle, transputer low word,
$2000 0000 - $2FFF FFFF : D32 cycle,
$3000 0000 - $3FFF FFFF : D16 cycle, transputer high word.
[1]cycle NOT intended to be used [2]PFM = Postfetch Mode [3]only for Local Bus databuffers test