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4-44 C156-E224-01EN
(6) MESSAGE REJECT message: 07h (I → T)
The message received most recently is invalid or unsupported.
(7) NO OPERATION message: 08h (I → T)
This message causes no operation.
(8) MESSAGE PARITY ERROR message: 09h (I → T)
This message notifies TARG that a parity error was detected in the last message,
in the last byte received by the INIT.
(9) BUS DEVICE RESET message: 0Ch (I → T)
This message instructs the clearing of all I/O operations (commands) being
executed or stacked in TARG. TARG performs initialization by clearing not only
I/O operations started by the INIT that sends this message but also all INIT I/O
operations.
(10) IDENTIFY message: 80h-FFh (I ←→ T)
Bit76543210
1D000 LUN
This message specifies the device addresses (LUN) of devices (logical units) under
TARG control to establish I/O operation paths between INIT and TARG.
a. Bit 6: Disconnect Privilege
If INIT specifies this bit as 1, TARG can execute disconnection. If it specifies 0,
TARG cannot execute disconnection.
b. Bits 2 to 0: LUN
These bits specify a logical unit under TARG control.
c. Message function
After the SELECTION phase, INIT first sends this message to TARG to specify
the logical units to be used for I/O operation. Similarly, after the RESELECTION
phase, TARG first sends this message to INIT to specify the logical units to be
reconnected.
(11) SYNCHRONOUS DATA TRANSFER REQUEST message (I → T)
Byte 0 1 2 3 4
01h 03h 01h m x
This message defines the parameters for synchronous data transfer between two
SCSI devices. Transfer Period specifies the data transfer rate. REQ/ACK Offset
that can be specified for the ODD ranges from 0 to 15. If REQ/ACK Offset is 0,
asynchronous transfer is used.
REQ/ACK Offset
Transfer Period [4 × m(ns)]