HIPPI
S2020/S2021 SOURCE DEVICE STATE MACHINES
Figure 4. S2020 Data/FIFO Interface SM State Transition Diagram
"CNRQ"•"NODT" + "DSCN" + "RST"
"DSCN" + "RST"
From 8
FROM 1; 2
{INIT}
"CON" + "CNRQ"
"DSCN" + "RST"
0
00000
"CON"
{DESTERR}
10
"CNRQ"•"NODT"
00000
"CNRQ"•"IFLD"
"CON"
{RDIFL}
10000
1
"CNRQ"
"DSCN" + "RST"
From 3, 4, 5, 6,
7, 8, 9 or 11
"CNRQ"•"IFLD"
"CNRQ"
{PST IFL}
& REQ
2
00001
"DSCN" + "RST"
"CON"
3
"CON" • "NPIF"
"CON" • "NPIF"
"CON"•"DRDY"
{IDLE}
00001
"CON" • "DRDY"
"CON" • "NPIF"
{WAITPKT}
10001
4
From 8
From 9
"CON" • "NPIF"
To 5
From 5, 6, 7, 8, 11
ON CONN REQ STATE
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