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Uni
vers
ity o
f Pun
e S.
E. I.
T.
Subj
ect c
ode:
214
442
Part
34
: PCI
and
SCS
I Bus
es
Com
pute
r Org
aniz
atio
n
UN
IT
V
Tush
ar B
. Kut
e,
Dep
artm
ent o
f Inf
orm
atio
n Te
chno
logy
, Sa
ndip
Inst
itute
of T
echn
olog
y &
Res
earc
h Ce
ntre
, Nas
hik.
ht
tp:/
/tus
hark
ute.
com
Stan
dard
I/O
Inte
rfac
es
Trad
ition
al (I
SA) (
with
cac
he)
High
Per
form
ance
Bus
PCI B
us
Perip
hera
l Com
pone
nt In
terc
onne
ct
In e
arly
199
2, th
e In
tel f
orm
ed a
n an
othe
r in
dust
rial g
roup
in re
latio
n to
the
PC b
us. T
he
mai
n ob
ject
ive
behi
nd th
e fo
rmat
ion
of th
e gr
oup
was
to o
verc
ome
the
wea
knes
s in
ISA
and
EISA
bu
ses.
Th
ey d
esig
ned
the
PCI s
peci
ficat
ions
in Ju
ne 1
992
and
upda
ted
in A
pril
1993
.
Feat
ures
Re
quire
s ver
y fe
w c
hips
to im
plem
ent.
Use
s the
syst
em b
us to
incr
ease
the
bus c
lock
spee
d.
Abili
ty to
func
tion
with
64-
bit d
ata
bus.
Hi
gh b
andw
idth
, 33
MHz
. Su
ppor
t of s
ingl
e an
d m
ultip
roce
ssor
syst
ems.
O
pera
te co
ncur
rent
ly w
ith th
e pr
oces
sor b
us.
Func
tion
as m
ezza
nine
or p
erip
hera
l bus
. Sy
nchr
onou
s tim
ings
. Be
tter
syst
em p
erfo
rman
ce fo
r hig
h sp
eed
I/O
subs
yste
ms
such
as A
GP,
NIC
, disk
cont
rolle
rs.
Plug
and
Pla
y.
PCI i
n sin
gle
proc
esso
r sys
tem
PCI i
n m
ulti
proc
esso
r sys
tem
PCI C
onne
ctor
PCI B
us L
ines
(req
uire
d)
Syst
ems l
ines
In
clud
ing
cloc
k an
d re
set
Addr
ess &
Dat
a 32
tim
e m
ux li
nes f
or a
ddre
ss/d
ata
Inte
rrup
t & v
alid
ate
lines
Inte
rfac
e Co
ntro
l Ar
bitr
atio
n N
ot sh
ared
Di
rect
conn
ectio
n to
PCI
bus
arb
iter
Erro
r lin
es
PCI B
us L
ines
(Opt
iona
l)
Inte
rrup
t lin
es
Not
shar
ed
Cach
e su
ppor
t 64
-bit
Bus E
xten
sion
Addi
tiona
l 32
lines
Ti
me
mul
tiple
xed
2 lin
es to
ena
ble
devi
ces t
o ag
ree
to u
se 6
4-bi
t tra
nsfe
r
JTAG
/Bou
ndar
y Sc
an
For t
estin
g pr
oced
ures
PCI C
omm
ands
Tran
sact
ion
betw
een
initi
ator
(mas
ter)
and
ta
rget
M
aste
r cla
ims b
us
Dete
rmin
e ty
pe o
f tra
nsac
tion
e.g.
I/O
read
/writ
e
Addr
ess p
hase
O
ne o
r mor
e da
ta p
hase
s
PCI R
ead
Tim
ing
Diag
ram
PCI B
us A
rbite
r
PCI B
us A
rbitr
atio
n
SCSI
Smal
l Com
pute
r Sys
tem
Inte
rfac
e, o
r SCS
I (p
rono
unce
d sc
uzzy
), is
a se
t of s
tand
ards
for
phys
ical
ly co
nnec
ting
and
tran
sfer
ring
data
bet
wee
n co
mpu
ters
and
per
iphe
ral d
evic
es.
The
SCSI
stan
dard
s def
ine
com
man
ds, p
roto
cols,
and
el
ectr
ical
and
opt
ical
inte
rfac
es.
SCSI
is m
ost c
omm
only
use
d fo
r har
d di
sks a
nd ta
pe
driv
es, b
ut it
can
con
nect
a w
ide
rang
e of
oth
er
devi
ces,
incl
udin
g sc
anne
rs a
nd C
D dr
ives
.
Back
grou
nd
SCSI
was
der
ived
from
"SAS
I", t
he "S
huga
rt
Asso
ciat
es S
yste
m In
terf
ace"
, dev
elop
ed c
. 197
8 an
d pu
blic
ly d
isclo
sed
in 1
981.
[2] A
SAS
I con
trol
ler
prov
ided
a b
ridge
bet
wee
n a
hard
disk
driv
e's l
ow-
leve
l int
erfa
ce a
nd a
hos
t com
pute
r, w
hich
nee
ded
to
read
blo
cks o
f dat
a.
Larr
y Bo
uche
r is c
onsid
ered
to b
e th
e "f
athe
r" o
f SAS
I an
d SC
SI d
ue to
his
pion
eerin
g w
ork
first
at S
huga
rt
Asso
ciat
es a
nd th
en a
t Ada
ptec
. Dal
Alla
n pr
onou
nced
the
new
acr
onym
as "
scuz
zy" a
nd th
at
stuc
k.
SCSI
Inte
rfac
e
SCSI
Inte
rfac
e
SCSI
Con
trol
ler
SCSI
-1
This
was
evo
lved
from
SAS
I in
1979
. it w
as
appr
oved
by
ANSI
in 1
986
as X
3.13
1-19
86.
SCSI
def
ines
the
basis
for f
irst S
CSI b
uses
in
clud
ing
cabl
e le
ngth
, sig
nalin
g fe
atur
es,
com
man
d an
d tr
ansf
er m
odes
. It
uses
onl
y a
8-bi
t bus
, with
5 M
B/s d
ata
tran
sfer
rate
.
SCSI
-2
The
exte
nsio
n of
orig
inal
SCS
I app
rove
d by
AN
SI in
19
94 a
nd re
leas
ed a
s X3.
131-
1994
. Fa
st S
CSI,
10 M
Hz, 1
0 M
B/s,
8bi
t reg
ular
SCS
I. W
ide
SCSI
, 16/
32 b
its.
Mor
e de
vice
s per
bus
: 16
Impr
oved
cabl
e an
d co
nnec
tors
(50
in S
CSI-1
) Ac
tive
term
inat
ion.
Di
ffere
ntia
l Sig
nalin
g, to
allo
w lo
ng c
able
leng
ths.
Co
mm
and
Que
uing
: allo
w m
ultip
le re
ques
ts o
n th
e bu
s Ad
ditio
nal C
omm
and
Set:
for C
DRO
Ms,
Sca
nner
SCSI
-3
Devi
sed
in 1
993.
Kn
own
as S
CSI-3
par
alle
l int
erfa
ce S
PI.
It de
fines
mec
hani
cal,
elec
tric
al p
roto
col l
ayer
s of t
he
inte
rfac
e.
Data
tran
sfer
rate
: 8-b
its a
t 20
MB/
s ove
r 50
pin
conn
ecto
r. 16
-bits
at 4
0 M
B/s o
ver 6
8 pi
n co
nnec
tor.
Th
e ca
pabi
litie
s of I
EEE-
1394
and
Fib
er C
hann
el w
ere
incl
uded
.
SCSI
Spe
eds
SCSI
Bus
term
inat
ion
Pass
ive
Term
inat
ion
Activ
e Te
rmin
atio
n Fo
rced
Per
fect
Term
inat
ion
High
Vol
tage
Diff
eren
tial
Low
Vol
tage
Diff
eren
tial
Data
tran
sfer
on
SCSI
bus
Initi
ator
Ta
rget
SCSI
Bus
Sig
nals
Refe
renc
es
Web
sites
: ht
tp:/
/en.
wik
iped
ia.o
rg
Com
pute
r Arc
hite
ctur
e an
d O
rgan
izatio
n
By A
. P. G
odse
(fro
m b
ooks
.goo
gle.
com
)
Com
pute
r Org
aniza
tion
By
Ham
ache
r and
Zak
y
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