ATA6870 ATMEL Corporation, ATA6870 Datasheet - Page 31

• Manufacturer Part Number: ATA6870
• Manufacturer: ATMEL Corporation

7.6.4.4
7.6.4.5
Figure 7-19. CONTROL and DATA Fields - 8-bits Register Write
Figure 7-20. CONTROL and DATA Fields - 8-bits Register Read
Figure 7-21. CONTROL and DATA Fields - 16-bits Register Write
9116B–AUTO–10/09
CS_N
MOSI
MISO
SCK
CS_N
CS_N
MOSI
MISO
MOSI
MISO
SCK
SCK
A(6) A(5)
CONTROL Field
DATA Field
A(6)
A(6)
A(4) A(3)
Data not relevant
A(5)
A(5)
The CONTROL field defines the register to access and the direction (read/write). The size of the
data (8, 16, or 112 bits) is defined by the address value in the CONTROL field.
Table 7-16.
The DATA field can be composed of 1, 2, or 14 bytes depending on the accessed register. Irre-
spective of the data direction, a byte is always transmitted with MSB first; a multi-byte word is
transmitted with MSByte first.
CONTROL Field
A(2) A(1)
A(4)
A(4)
A(3)
A(3)
Data not relevant
Data not relevant
A(0)
A(2)
A(2)
1
Control Field
A(1)
A(1)
D(15) D(14)
Bit7
A6
A(0)
A(0)
D(13) D(12)
Data not relevant
1
0
Bit6
A5
D(11) D(10)
D(7) D(6)
D(7) D(6)
Bit5
A4
D(9) D(8)
D(5) D(4) D(3) D(2) D(1) D(0)
D(5) D(4) D(3) D(2) D(1) D(0)
Data not relevant
Bit4
A3
Data not relevant
ATA6870 [Preliminary]
D(7) D(6) D(5)
Bit3
A2
Data not relevant
D(4)
Bit2
D(3)
A1
D(2) D(1) D(0)
Bit1
A0
W/Rd
Bit0
31