5-5
This notifies the microcontroller to read the WDATAx
(0xFC21/0xFC29) register. The WINT and the RINT bits
are ORed together to generate the port interrupt, which
goes to the microcontroller using the
register.
Note:
The RINT and WINT bits are not self-clearing, so the
microcontroller must clear this bit if the port is interrupt
driven.
Register: 0xFC23/0xFC2B
Physical Address (PHAD0/PHAD1)
Read Only
PA[7:0]
Physical Address
[7:0]
The Physical Address registers are read only registers
that contain values of the PA inputs.
Register: 0xFC24/0xFC2C
Live ESI (LESI0/LESI1)
Read Only
PESI/
PARALLEL_ESI/ Value
7
Reading this active low bit gives the state of the PESI/
signal, which is used to select between the SEL_ID and
the bidirectional interface that distinguishes the SFF-8067
interface from SFF-8045.
DWR/
DSK_WR/ Value
6
Reading this active low bit gives the state of the
DSK_WR/ signal on the SFF-8067 interface. When this
active low bit is cleared, the drive is ready to write data
7
6
5
4
3
2
1
0
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Default:
x
x
x
x
x
x
x
x
7
6
5
4
3
2
1
0
PESI/
DWR/
RD/
ACK/
D3
D2
D1
D0
Defaults:
x
x
x
x
x
x
x
x
Содержание Symbios SYM53C040
Страница 12: ...xii Preface...
Страница 90: ...4 18 SCSI and DMA Registers...
Страница 98: ...5 8 SFF 8067 Registers...
Страница 110: ...6 12 Two Wire Serial Registers...
Страница 126: ...7 16 Miscellaneous Registers...
Страница 160: ...8 34 System Registers...
Страница 184: ...9 24 Electrical Characteristics...
Страница 194: ...A 10 Register Summary...
Страница 214: ......