3-18
Signal Descriptions
3.2 SFF-8067 Mode
The SFF-8067 interface is enabled when the DIFFSENS pin is tied to
V
DD
. The SCSI pin functions are reassigned to SFF-8067 port functions
as indicated in
Table 3.9
Pin Assignments for SFF-8067 Mode
Signal Name
Pin/Ball
No.
Description
8067 Port
Pad
Configuration
D0, SEL_0
147/D6
When PARALLEL_ESI/ is asserted,
this signal contains bit 0 of a data
nibble for read and write operations.
When PARALLEL_ESI/ is
deasserted, this signal is the SEL_0
signal, included for compatibility with
SFF-8045.
Port 0
4 mA open drain
bidirectional
D1, SEL_1
146/C6
When PARALLEL_ESI/ is asserted,
this signal contains bit 1 of a data
nibble for read and write operations.
When PARALLEL_ESI/ is
deasserted, this signal is the SEL_1
signal, included for compatibility with
SFF-8045.
Port 0
4 mA open drain
bidirectional
D2, SEL_2
145/A6
When PARALLEL_ESI/ is asserted,
this signal contains bit 2 of a data
nibble for read and write operations.
When PARALLEL_ESI/ is
deasserted, this signal is the SEL_2
signal, included for compatibility with
SFF-8045.
Port 0
4 mA open drain
bidirectional
D3, SEL_3
144/B6
When PARALLEL_ESI/ is asserted,
this signal contains bit 3 of a data
nibble for read and write operations.
When PARALLEL_ESI/ is
deasserted, this signal is the SEL_3
signal, included for compatibility with
SFF-8045.
Port 0
4 mA open drain
bidirectional
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: ......