CHAPTER 12 NBD FUNCTION (
µµµµ
PD70F3116)
630
User’s Manual U14492EJ3V0UD
(2) Command packet
NBD Bus Line
AD3_DBG
AD2_DBG
AD1_DBG
AD0_DBG
1st
aux3
aux2
aux1
aux0
2nd
SIZ1
SIZ0
R/W
I/T
3rd
A3
A2
A1
A0
4th
A7
A6
A5
A4
5th
A11
A10
A9
A8
6th
A15
A14
A13
A12
7th
A19
A18
A17
A16
8th
A23
A22
A21
A20
9th
D3
D2
D1
D0
10th
D7
D6
D5
D4
11th
D11
D10
D9
D8
12th
D15
D14
D13
D12
13th
D19
D18
D17
D16
14th
D23
D22
D21
D20
15th
D27
D26
D25
D24
16th
D31
D30
D29
D28
Caution
Values are for command packet maximum setup.
•
Access to NBD space
Address: 12 bits (A0 to A11) [Fixed]
Data: 8 bits (D0 to D7)
••••
Access to target space
Address: 24 bits (A0 to A23) [Fixed]
Data: 32 bits (D0 to D31)
(a) aux0 to aux3: Expansion bits
aux0
aux1
aux2
aux3
Remarks
0
0
0
0
Fixed
Other than 0000
For future expansion
(b) I/T: Access address space mode specification
I/T
Remarks
0
Specifies access to NBD space
1
Specifies access to target space
(c) R/W: Access mode specification from NBD tool
R/W
Remarks
0
Read mode from NBD tool
1
Write mode from NBD tool
Содержание V850E/IA1 mPD703116
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