SYS68K/CPU-30 R4 Technical Reference Manual
Hardware Description
Page 97
This default configuration is useful if a user program or an operating
system is started, and additional memory boards with known data sizes
are installed.
SEE ALSO: For details on the usage of the rotary switches, please refer
to Section 5.4.3, ‘Control Switches (Rotary Switches),’ on page 127.
3.17.2 Address
Modifier
Implementation
The VMEbus defines three different Address Modifier ranges as shown
in the following table:
1. RMW=Read-Modify-Write
1. RMW=Read-Modify-Write
Table 31: Defined VMEbus Transfer Cycles (D32 Mode)
Transfer Type
D31-D24
D23-D16
D15-D08
D07-D00
Byte
Byte
X
X
Word
X
X
Long Word
X
X
X
X
Unaligned Word
Unaligned Long Word A
Unaligned Long Word B
X
X
X
X
X
X
X
X
RMW
1)
Byte
RMW Byte
RMW Word
RMW Long Word
X
X
X
X
X
X
X
X
Table 32: VMEbus Transfer Cycles (D16 Mode)
Transfer Type
D31-D24
D23-D16
D15-D08
D07-D00
Byte
Byte
X
X
Word
X
X
RMW
1)
Byte
RMW Byte
RMW Word
X
X
X
X
Table 33: Address Ranges
Mode
Address Lines Used
Short Form
Extended Addressing
A1-A31
A32
Standard Addressing
A1-A24
A24
Short I/O
A1-A15
A16
☞
Содержание SYS68K/CPU-30 R4
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Страница 189: ...Appendix to VMEPROM SYS68K CPU 30 R4 Technical Reference Manual Page 176...