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SFF-8067 Mode
3-19
ENCL_ACK/,
SEL_4
142/E7
When PARALLEL_ESI/ is asserted,
this is an active low acknowledge
signal sourced by the SYM53C040
back to the Fibre Channel device.
When PARALLEL_ESI/ is
deasserted, this signal is the SEL_4
signal, included for compatibility with
SFF-8045.
Port 0
4 mA open drain
bidirectional
DSK_RD/,
SEL_5
141/D7
When PARALLEL_ESI/ is asserted,
this is an active low control signal
sourced by the drive to the
SYM53C040 to indicate the device
is ready to read data. When
PARALLEL_ESI/ is deasserted, this
signal is the SEL_5 signal, included
for compatibility with SFF-8045.
Port 0
4 mA open drain
bidirectional
DSK_WR/,
SEL_6
140/A7
When PARALLEL_ESI/ is asserted,
this is an active low control signal
sourced by the drive to the
SYM53C040 to indicate the device
is ready to write data. When
PARALLEL_ESI/ is deasserted, this
signal is the SEL_6 signal, included
for compatibility with SFF-8045.
Port 0
4 mA open drain
bidirectional
PARALLEL_
ESI/
139/B7
Used to select between the SEL_ID
and the bidirectional interface. Pull-
up resistors on the interface are 3.3
k
Ω
minimum. When this pin is
asserted, the drive begins the
discovery process and prepares to
read or write data. When this pin is
deasserted, the drive is presented
with SEL_ID. All SFF-8067
transactions are terminated,
regardless of the state of the
protocol.
Port 0
4 mA open drain
bidirectional
D0, SEL_0
137/E8
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 1
4 mA open drain
bidirectional
Table 3.9
Pin Assignments for SFF-8067 Mode (Cont.)
Signal Name
Pin/Ball
No.
Description
8067 Port
Pad
Configuration
Summary of Contents for Symbios SYM53C040
Page 12: ...xii Preface...
Page 90: ...4 18 SCSI and DMA Registers...
Page 98: ...5 8 SFF 8067 Registers...
Page 110: ...6 12 Two Wire Serial Registers...
Page 126: ...7 16 Miscellaneous Registers...
Page 160: ...8 34 System Registers...
Page 184: ...9 24 Electrical Characteristics...
Page 194: ...A 10 Register Summary...
Page 214: ......