5-4
SFF-8067 Registers
associated 8067 port using the MDATA
(0xFC25/0xFC2D) register, which contains output data,
and the LESI (0xFC24/0xFC2C) register, which is used to
read the port pins. Setting this bit disables automatic
receive or transmit over the 8067 interface.
R
Reserved (read only)
[6:5]
BSY
Port Busy Flag
4
This bit is set to a 1 when the associated 8067 port is in
any state other than idle. Writing a 0 to this bit will remove
the lockout to the other 8067 port. This bit should only be
cleared when the device connected to this port is not
responding. Therefore, a 0x10 should be written to this
register when clearing interrupts.
RRF
Read Register Full (read only)
3
This read only bit is written to a 1 when a read request
has been made from the associated 8067 port and the
microcontroller loads the RDATAx (0xFC20/0xFC28)
register. This bit is cleared by the associated 8067 port
when the register data has been transferred onto the
associated 8067 port and acknowledged.
WRF
Write Register Full (read only)
2
This bit is written to a 1 by the associated 8067 port when
a byte of data has been loaded into the WDATAx
(0xFC21/0xFC29) register from the associated 8067 port.
When the microcontroller reads the WDATAx
(0xFC21/0xFC29) register this bit will be automatically
cleared. This bit is read only.
RINT
Read Interrupt
1
This bit is written to a 1 by the associated 8067 port when
a read request has been made from the associated 8067
port. This notifies the microcontroller to load the RDATAx
(0xFC20/0xFC28) register. The WINT and the RINT bits
are ORed together to generate the port interrupt, which
goes to the microcontroller using the
register (
WINT
Write Interrupt
0
This bit is written to a 1 by the associated 8067 port when
a byte of data has been loaded into the WDATAx
(0xFC21/0xFC29) register from the associated 8067 port.
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: ......