Req/-Ack Handshake; Q250/Q280 Target Sends Data - Quantum Q250 Technical Reference Manual

~ CSI
DATA
TARGET
-REG
INITIATOR DMA
[
ACK
««
VALID DATA
>>>>
«<
VALID
DISK CYCLE
SCSI CYCLE DISK CYCLE
j o e - - - -
BOOns
.1
HOST LATCHES -ACK: 1.25 MBYTE/SEC TRANSFER RATE
~ CSI
««
VALID DATA
»»
«<
VALID
TARGET DATA
~~"""';';'=;"';;';";";";";""....£I,~--------~~-:";";=~
-REG ----.
I~----------------------~
I N 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