Quantum Q280

~
CSI
DATA
TARGET
-REG
INITIATOR DMA
[
ACK
«« VALID DATA >>>>
«<
VALID
DISK CYCLE
SCSI CYCLE
DISK CYCLE
joe---- BOOns .1
HOST LATCHES -ACK: 1.25 MBYTE/SEC TRANSFER RATE
~
CSI «« VALID DATA »» «< VALID
TARGET DATA ~~"""';';'=;"';;';";";";";""....£I,~--------~~-:";";=~
-REG ----.
I~----------------------~
IN ITIATO{::
INIT HAS LATCHED
SCSI DATA
MORE THAN 100ns
DELAY
J
DISK CYCLE NOP CYCLE
,.....-------- 1600ns ---------~~
SCSI
CYCLE
HOST DELAYS -ACK: 625 MBYTE/SEC TRANSFER RATE
Figure 4-1: -REQ/-ACK Handshake.
Q250/Q280 Target Sends Data
4-2