Rainbow-electronics W90P710CDG Bedienungsanleitung PDF herunterladen (Seite 45)

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W90P710CD/W90P710CDG

Publication Release Date: September 19, 2006

- 45 - Revision B2

Table 6.2.13 and Table 6.2.14

Using little-endian and byte access, Program/Data path between register and external memory.

BA = Address whose LSB is 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F

BAL = Address whose LSB is 0,2,4,6,8,A,C,E BAU = Address whose LSB is 1,3,5,7,9,B,D,F

BA0 = Address whose LSB is 0,4,8,C BA1 = Address whose LSB is 1,5,9,D

BA2 = Address whose LSB is 2,6,A,E BA3 = Address whose LSB is 3,7,B,F

Table6.2.13 Byte access write operation with little Endian

Access Operation Write Operation (CPU Register Î External Memory)

XD Width Word Half Word Byte

Bit Number

CPU Reg Data

31 0

ABCD

31 0

ABCD

31 0

ABCD

BA0 BA1 BA2 BA3 BAL BAU BA

Bit Number

31 0

D D D D

31 0

D D D D

31 0

D D D D

31 0

D D D D

31 0

D D D D

31 0

D D D D

31 0

D D D D

Bit Number

7 0

15 8

23 16

31 24

7 0

15 8

7 0

BA0 BA0 BA0 BA0 BAL BAL BA

nWBE [3-0] /

SDQM [3-0]

UUUA UUAU UAUU AUUU XXUA XXAU XXXA

Bit Number

31 0

X X X D

31 0

X X D X

31 0

X D X X

31 0

D X X X

15 0

X D

15 0

D X

7 0

Bit Number

Ext. Mem Data

7 0

15 8

23 16

31 24

7 0

15 8

7 0

Timing Sequence

Table6.2.14 Byte access read operation with Little Endian

Access Operation Read Operation (CPU Register Í External Memory)

XD Width Word Half Word Byte

Bit Number

CPU Reg Data

7 0

BA0 BA1 BA2 BA3 BAL BAU BA

Bit Number

7 0

Bit Number

7 0

BA0 BA0 BA0 BA0 BAL BAL BA

SDQM [3-0]

UUUA UUAU UAUU AUUU XXUA XXAU XXXA

Bit Number

31 0

ABCD

31 0

ABCD

31 0

ABCD

31 0

ABCD

15 0

7 0

Bit Number

Ext. Mem Data

31 0

ABCD

15 0

7 0

Timing Sequence

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 551 552

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