Hardware Description
SYS68K/CPU-30 R4 Technical Reference Manual
Page 72
3.10.6 DMA Control
Lines at PI/T #1
PB6, PB7:
These lines control the local peripheral bus when the DMA controller is
active. The signal PC6 controls the direction of the DMA transfer (read
vs. write). The PC7 signal selects the target of the DMA transfer (SCSI
controller or Floppy controller). The following table clarifies all four
possible combinations.
3.10.7 8-Bit User
Defined I/O
Port at PI/T #1
PC0, PC1, PC4, PC7, H1-H4: (FACTORY OPTION)
This 8-bit input port may be available (as a factory option) at the 16-pin
connector B5 and may be available (as a factory option) at the 5-row
VME P2 connector. Four bits are connected to port C of PI/T #1 and can
be used as inputs or outputs. The remaining four bits are connected to the
handshake pins of PI/T #1. Handshake pins H2 and H4 may be used as
either inputs or outputs. Handshake pins H1 and H3 may only be used as
inputs.
The connector B5 (factory option) provides, besides the 8-bit user port
signals, a power signal GND on pins 9, 10, 11, 12, 13, 14, 15, and 16.
PB7
PB6
Function
0
0
DMA write to SCSI
0
1
DMA read from SCSI
1
0
DMA write to FDC
1
1
DMA read from SCSI
PI/T #1
B5
VME P2
I/O
H1
4
Z25
I
H2
3
Z27
I/O
H3
2
Z29
I
H4
1
Z31
I/O
C0
8
D27
I/O
C1
7
D28
I/O
C4
6
D29
I/O
C7
5
D30
I/O
Содержание SYS68K/CPU-30 R4
Страница 41: ...Installation SYS68K CPU 30 R4 Technical Reference Manual Page 28...
Страница 127: ...Hardware Description SYS68K CPU 30 R4 Technical Reference Manual Page 114...
Страница 130: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 117 4 2 1 RTC 72421...
Страница 131: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 118 4 2 2 DUSCC 68562...
Страница 132: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 119 4 2 3 PI T TS68230...
Страница 133: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 120 4 2 4 SCSI 87033 34...
Страница 134: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 121 4 2 5 FDC37C65C...
Страница 135: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 122 4 2 6 LANCE Am79C90...
Страница 136: ...SYS68K CPU 30 R4 Technical Reference Manual Set of Data Sheets Page 123 4 2 7 SIA Am7992B...
Страница 137: ...Set of Data Sheets SYS68K CPU 30 R4 Technical Reference Manual Page 124 4 2 8 Motorola MC68030 and MC68882...
Страница 145: ...VMEPROM SYS68K CPU 30 R4 Technical Reference Manual Page 132...
Страница 189: ...Appendix to VMEPROM SYS68K CPU 30 R4 Technical Reference Manual Page 176...