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MSG SCSI MSG/ Signal 2
C/D SCSI C_D/ Signal 1
I/O SCSI I_O/ Signal 0
These three SCSI phase status bits (MSG, C/D, and I/O)
are latched on the asserting edge of SREQ/ when
operating in either initiator or target mode. These bits are
set when the corresponding signal is active. They are
useful when operating in the low level mode.
Register: 0x0F (0x8F)
SCSI Status Two (SSTAT2)
Read Only
R Reserved [7:2]
LDSC Last Disconnect 1
This bit is used in conjunction with the Connected (CON)
bit in SCSI Control One (SCNTL1). It allows the user to
detect the case in which a target device disconnects, and
then some SCSI device selects or reselects the
LSI53C810A. If the Connected bit is asserted and the
LDSC bit is asserted, a disconnect is indicated. This bit
is set when the Connected bit in SCSI Control One
(SCNTL1) is cleared. This bit is cleared when a Block
Move instruction is executed while the Connected bit in
SCSI Control One (SCNTL1) is on.
R Reserved 0
7 210
R LDSC R
x x x x x x1x