SCSI , , . SCSI , 18 . . . . , , .
(single ended) (differential) SCSI. , .
SE (Single Ended) - . () , . SCSI-1 , . (. . 5.1.2). SCSI-2 (active negation). , . , ; . SCSI-3 SPI (CMOS).
Diff, HVD, , . , RS-485, , . , PC . HVD ( Diff) SCSI-2, SPI-3 (SCSI-3 1999 ) , Ultra2 .
LVD 40, 80 160 / Ultra2, Ultra160 Ultra320 SCSI 25 (8 ) 12 (16 ). LVD SE (Multimode LVD). LVD DIFFSENS LVD () SE (). , , SE , SE, SE.
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, /, , ( ). SCSI 8 (Narrow), 5 /. (wide) 16 . (. 5.1), 320 /. , , Western Digital 2000 . Fast SCSI 10 /, SCSI-2. Fast-20 Fast Wide SCSI (16 , 10 MT/s). Ultra SCSI 20 /, SCSI-3. Fast-40 Wide Ultra SCSI (16 , 20 MT/s). Ultra2 SCSI 40 /, Fast-80 Wide Ultra2 SCSI (16 , 40 MT/s). , SCSI-3, . LVD. SCSI-3 Ultra3 SCSI . Ultra160 SCSI 160 / (16 ) . , CRC-, ( Ultra DMA ATA). 2001 Ultra320 SCSI 320 /.
5.1. (/) SCSI
, | ||||||
Fast | Fast-20 (Ultra) | Fast-40 (Ultra2) | Ultra 160 (Ultra3) | Ultra 320 | ||
8 (Narrow) | 5 | 10 | 20 | 40 | ||
16 (Wide) | 10 | 20 | 40 | 80 | 160 | 320 |
Ultra2 SCSI , SCSI.
, ,
. , , . . , ; T- ( 10 , ). , , . , . (. 5.2) - , , . .
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5.2. SCSI
(5 /) | Fast (10 /) | Ultra (20 /) | Ultra2 (40 /) | Ultra160 (80 /) | Ultra320 (160 /) | |
(Single ended) | 6 | 3 | 1,5 (8 .), 3 (4 .) | |||
(HVD) | 25 | 12 (16 .), 25 (8 .) | 6 (16 .), 25 (8 .) | |||
, (LVD) | 12 (16 .), 25 (8 .) | 12 (16 .), 25 (8 .) | 12 (16 .), 25 (8 .) |
, SCSI, , . , ( ; ). , . D-25, , , DB-50. .
♦ IDC-50 ( ATA, 40- IDC-40). 0,1" (2,54 ), , (. 5.1, ). (IDC-50M), (IDC-50F).
♦ -50 Centronics, ( 50-). 0,085" (2,16 ) (. 5.1, ). . ( SCSI-) (CX-50F), (-50). , , . SCSI-1 (SCSI-1 External).
♦ DB-25 D- ( LPT- ). (DB-25F), (DB-25M); (. 5.1, ). (, Zip).
♦ HD-50, MiniD50 (. 5.1, ), D- , (High Density) 0,05" (1,27 ). (HD-50F), (HD-50M); (). SCSI-2 (SCSI-2 External).
. 5.1. 8- SCSI: IDC-50P, CX-50P, DB-25P, HD-50F
♦ HD-68, MiniD68, , 68 . (HD-68F MiniD68F), (HD-68M MiniD68M). , . SCSI-3, . . 5.2 , , .
. 5.2. 16- SCSI HD-68F
♦ VHDCI-68 (Very High Density Connector), Centronics 0,8 . , SCSI-4 SCSI-5.
♦ (Micro-centronics) Centronics, . -68 MCX-80 SCA.
♦ SCA (Single Connector Attachment) . , (, , , ). SCA-2 MCX-80 (. 5.3). (MCX-80F), (-80). , , (, . .). . , ( ).
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. 5.3. SCSI SCA-80
Narrow SCSI , . 5.1, Wide SCSI . 5.2. D- SCA-2, (. 5.3).
SCSI .
♦ -. 8- , 25 . , , 25 :
- SCSI-1 SCSI-2 IDC-50 (, . . 5.1, );
- SCSI-1 Centronics-50 (CX-50M, . . 5.1, );
- SCSI-2 MiniD50M (HD-50M, . . 5.1, ).
♦ B-. 16/32- SCSI-2.
♦ P-. 8/16- 34 , . SCSI-2/3, 8- 15, 3139, 6568 :
P- SCSI-3 HD-68M ;
P- SCSI-3 MiniD68M ;
P- SCSI SPI-2 VHDCI-68M ( SCSI-4 SCSI-5).
♦ Q-. 68- 32 , P- . Q- , SCSI SPI-3 .
♦ Mac SCSI. DB-25P (. . 5.1, ) 8-, Macintosh ( . ), (Iomega ZIP Drive). , 25- -.
- ( ) . . , , ( !) (. . 5.1.5). SCA , , .
. 5.35.7. , . , () ( SE-).
5.3. A- SCSI
IDC-50/CX-50 | SE/Diff | IDC-50/CX-50 | |
1/1 | GND/DB0+ | 2/26 | DB0# |
3/2 | GND/DB1+ | 4/27 | DB1# |
5/3 | GND/DB2+ | 6/28 | DB2# |
7/4 | GND/DB3+ | 8/29 | DB3# |
9/5 | GND/DB4+ | 10/30 | DB4# |
11/6 | GND/DB5+ | 12/31 | DB5# |
13/7 | GND/DB6+ | 14/32 | DB6# |
15/8 | GND/DB7+ | 16/33 | DB7# |
17/9 | GND/DBP0+ | 18/34 | DBP0# |
19/10 | GND/GND | 20/35 | GND |
21/11 | GND/GND | 22/36 | GND |
23/12 | 24/37 | ||
25/13 | 26/38 | TERMPWR | |
27/14 | 28/39 | ||
29/15 | GND | 30/40 | GND |
31/16 | GND/ATN+ | 32/41 | ATN# |
33/17 | GND | 34/42 | GND |
35/18 | GND/BSY+ | 36/43 | BSY# |
37/19 | GND/ACK+ | 38/44 | ACK# |
39/20 | GND/RST+ | 40/45 | RST# |
41/21 | GND/MSG+ | 42/46 | MSG# |
43/22 | GND/SEL+ | 44/47 | SEL# |
45/23 | GND/C/D+ | 46/48 | C/D# |
47/24 | GND/REQ+ | 48/49 | REQ# |
49/25 | GND/I/O+ | 50/50 | I/O# |
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5.4. B- SCSI
./. | SE/Diff | ./. | |
1/1 | GND | 2/35 | GND |
3/2 | GND/DB8+ | 4/36 | DB8# |
5/3 | GND/DB9+ | 6/37 | DB9# |
7/4 | GND/DB10+ | 8/38 | DB10# |
9/5 | GND/DB11+ | 10/39 | DB11# |
11/6 | GND/DB12+ | 12/40 | DB12# |
13.07.12 | GND/DB13+ | 14/41. | DB13# |
15/8 | GND/DB14+ | 16/42 | DB14# |
17/9 | GND/DB15+ | 18/43 | DB15# |
19/10 | GND/DBP1+ | 20/44 | DBP1# |
21/11 | GND/ACKB+ | 22/45 | ACKB# |
23/12 | GND/GND | 24/46 | GND |
25/13 | GND/REQB+ | 26/47 | REQB# |
27/14 | GND/DB16+ | 28/48 | DB16# |
29/15 | GND/DB17+ | 30/49 | DB17# |
31/16 | GND/DB18+ | 32/50 | DB18# |
33/17 | TERMPWR | 34/51 | TERMPWR |
35/18 | TERMPWR | 36/52 | TERMPWR |
37/19 | GND/DB19+ | 38/53 | DB19# |
39/20 | GND/DB20+ | 40/54 | DB20# |
41/21 | GND/DB21+ | 42/55 | DB21# |
43/22 | GND/DB22+ | 44/56 | DB22# |
45/23 | GND/DB23+ | 46/57 | DB23# |
47/24 | GND/DBP2+ | 48/58 | DBP2# |
49/25 | GND/DB24+ | 50/59 | DB24# |
51/26 | GND/DB25+ | 52/60 | DB25# |
53/27 | GND/DB26+ | 54/61 | DB26# |
55/28 | GND/DB27+ | 56/62 | DB27# |
57/29 | GND/DB28+ | 58/63 | DB28# |
59/30 | GND/DB29+ | 60/64 | DB29# |
61/31 | GND/DB30+ | 62/65 | DB30# |
53/32 | GND/DB31+ | 64/66 | DB31# |
65/33 | GND/DBP2+ | 66/67 | DBP2# |
67/34 | GND/GND | 68/68 | GND |
5.5. P- SCSI
SE/Diff | |||
1 | GND/DB12+ | 35 | DB12# |
2 | GND/DB13+ | 36 | DB13# |
3 | GND/DB14+ | 37 | DB14# |
4 | GND/DB15+ | 38 | DB15# |
5 | GND/DBP1+ | 39 | DBP1# |
6 | GND/DB0+ | 40 | DB0# |
7 | GND/DB1+ | 41 | DB1# |
8 | GND/DB2+ | 42 | DB2# |
9 | GND/DB3+ | 43 | DB3# |
10 | GND/DB4+ | 44 | DB4# |
11 | GND/DB5+ | 45 | DB5# |
12 | GND/DB6+ | 46 | DB6# |
13 | GND/DB7+ | 47 | DB7# |
14 | GND/DBP0+ | 48 | DBP0# |
15 | GND | 49 | GND |
16 | DIFFSENS (GND)¹ | 50 | GND |
17 | TERMPWR | 51 | TERMPWR |
18 | TERMPWR | 52 | TERMPWR |
19 | 53 | ||
20 | GND | 54 | GND |
21 | GND/ATN+ | 55 | ATN# |
22 | GND/GND | 56 | GND |
23 | GND/BSY+ | 57 | BSY# |
24 | GND/ACK+ | 58 | ACK# |
25 | GND/RST+ | 59 | RST# |
26 | GND/MSG+ | 60 | MSG# |
27 | GND/SEL+ | 61 | SEL# |
28 | GND/C/D+ | 62 | C/D# |
29 | GND/REQ+ | 63 | REQ# |
30 | GND/I/O+ | 64 | I/O# |
31 | GND/DB8+ | 65 | DB8# |
32 | GND/DB9+ | 66 | DB9# |
33 | GND/DB10+ | 67 | DB10 |
34 | GND/DB11+ | 68 | DB11 |
¹ DIFFSENS LVD.
5.6. Mac SCSI (DB-25)
1 | REQ# | 14 | GND |
2 | MSG# | 15 | C/D# |
3 | I/O# | 16 | GND |
4 | RST# | 17 | ATN# |
5 | ACK# | 18 | GND |
6 | BSY# | 19 | SEL# |
7 | GND | 20 | DBP0# |
8 | DB0# | 21 | DB1# |
9 | GND | 22 | DB2# |
10 | DB3# | 23 | DB4# |
11 | DB5# | 24 | GND |
12 | DB6# | 25 | TERMPWR |
13 | DB7# |
5.7. SCA-80
SE/Diff | |||
01 | 12 Volt Charge | 41 | 12V GND |
02 | 12 Volt | 42 | 12V GND |
03 | 12 Volt | 43 | 12V GND |
04 | 12 Volt | 44 | Mated 1 |
05 | 45 | ||
06 | 46 | GND | |
07 | DB11# | 47 | GND/DB11+ |
08 | DB10# | 48 | GND/DB10+ |
09 | DB9# | 49 | GND/DB9+ |
10 | DB8# | 50 | GND/DB8+ |
11 | I/O# | 51 | GND/I/O+ |
12 | REQ# | 52 | GND/REQ+ |
13 | C/D# | 53 | GND/C/D+ |
14 | SEL# | 54 | GND/SEL+ |
15 | MSG# | 55 | GND/MSG+ |
16 | RST# | 56 | GND/RST+ |
17 | ACK# | 57 | GND/ACK+ |
18 | BSY# | 58 | GND/BSY+ |
19 | ATN# | 59 | GND/ATN+ |
20 | DBP0# | 60 | GND/DBP0+ |
21 | DB7# | 61 | GND/DB7+ |
22 | DB6# | 62 | GND/DB6+ |
23 | DB5# | 63 | GND/DB5+ |
24 | DB4# | 64 | GND/DB4+ |
25 | DB3# | 65 | GND/DB3+ |
26 | DB2# | 66 | GND/DB2+ |
27 | DB1# | 67 | GND/DB1+ |
28 | DB0# | 68 | GND/DB0+ |
29 | DBP1# | 69 | GND/DBP1+ |
30 | DB15# | 70 | GND/DB15+ |
31 | DB14# | 71 | GND/DB14+ |
32 | DB13# | 72 | GND/DB13+ |
33 | DB12# | 73 | GND/DB12+ |
34 | 5 Volt | 74 | Mated 2 |
35 | 5 Volt | 75 | 5V GND |
36 | 5 Volt Charge | 76 | 5V GND |
37 | 77 | Active LED Out | |
38 | Auto Spin Up | 78 | Delayed Start |
39 | SCSI I D 0 | 79 | SCSI I D 1 |
40 | SCSI I D 2 | 80 | SCSI I D 3 |
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, SCSI , . ( SCSI), , . SCSI :
♦ ;
♦ .
, SCSI , . , . () . , SCSI, 85-110 . ( ), .
SCSI, , . , , ( SCSI), . , , , , . , . (active negation), . ( , ) .
, : , (, ), . SCSI , ; , . ATA.
, SE LVD. LVD SE ( ); LVD/SE. : ( ) LVD, ( SE). SE, (, ). , HVD (Diff) LVD/SE .
SE LVD . SCSI : . SE ( ); . LVD ; . SE LVD . 5.4, : . ( !) ; TERMPWR (+5.).
♦ SE (. 5.4, ) 132 , . SCSI ( 5/10 / / ). Fast SCSI, Ultra SCSI .
♦ SE (. 5.4, ) 110 , Fast SCSI, () +2,85 , TermPWR. , . , - .
♦ FPT SE (Forced Perfect Terminator) , SE-.
♦ LVD (. 5.4, ) 105 ( 150 ). 112 ( ).
♦ LVD/SE SE-, LVD, ( ) SCSI .
. 5.4. SCSI: SE , SE , LVD
LVD/SE, , DIFSENSE. SE , , . LVD 1,3 . HVD 2,1 . , , , ( HVD, ). (, DS2117, DS2118 Dallas Semiconductor), 9 . 16- (Wide SCSI) 3 . , .
( ), ( ). . (SCSI-1) . - . ( ). , . , Ultra-Wide SCSI $1015. .
, , , LVD-. LVD- , , : , . , .
LVD !
. 5.8. L-: , # . () +.
5.8. SCSI
BSY# | Busy |
SEL# | Select (Select) (Reselect) |
C/D# | Control/Data ( )/ ( ) |
I/O# | Input/Output : . (Select) (Reselect) : Selection |
MSG# | Message |
DB[0:31]# | Data Bus |
DP[0:3]# | Data Parity , . DP0# DB[0:7], , DP3# DB[24:31]. |
TERMPWR | Terminator Power |
ATN# | Attention ( ) |
REQ# | Request |
ACK# | Acknowledge ( REQ#) |
RST# | Reset |
DIFFSENS | (LVD) : 0,7 SE; 0,91,9 LVD; 2,4 HVD |
SCSI, , , . 8- 07, 16- 0-15. . - . SCSI ID, . , . DB0# (SCSI ID=00000001), 7 DB7# (SCSI ID=10000000). ; . , .
. (initiator), (target) . . : - (), (). , , . : , , (Reselect) . () (Copy Master) , ( ).
() , (REQuest) (ACKnowledge). ( ), . , ( SCSI-1 ).
. . 5.9.
5.9. SCSI
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BSY# | SEL# | REQ#, C/D#, I/O#, MSG# | ACK#, ATN# | DBx#, DBPx# | |
Bus Free | - | - | - | - | - |
Arbitration | AA1 | WA2 | - | - | SID3 |
Selection | I4, T5 | I | - | I | I |
Reselection | I, T | T | T | I | T |
Command | T | - | T | I | I |
Data IN | T | - | T | I | T |
Data OUT | T | - | T | I | I |
Status | T | - | T | I | T |
Message IN | T | - | T | I | T |
Message OUT | T | - | T | I | I |
1 AA: , ;
2 WA: ;
3 SID: , SCSI ID;
4 I: ;
5 T: .
Bus Free ; . BSY# SEL#.
Arbitration . (Bus Free), BSY# SCSI ID. , , . , , SEL# Selection Reselection.
Selection , , , . ATN# , Message OUT. BSY#. I/O# Reselection. BSY#, ( ). . , -, RST#.
Reselection , . , . , , , . BSY#, I/O# Selection. BSY#, - .
Command, Data, Status Message , MSG#, C/D# I/O# (. 5.10), . ( Message OUT) ATN#, , MSG#, C/D#, I/O# BSY#.
5.10. SCSI
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MSG# | C/D# | I/O# | ||
0 | 0 | 0 | Data OUT | I→T |
0 | 0 | 1 | Data IN | I←T |
0 | 1 | 0 | Command | I→T |
0 | 1 | 1 | Status | I←T |
1 | 0 | 0 | ||
1 | 0 | 1 | ||
1 | 1 | 0 | Message OUT | I→T |
1 | 1 | 1 | Message IN | I←T |
. 5.5. REQ#/ACK#. , REQ# ( ). ACK#. .
. 5.5. (DI , DT )
Data OUT Data IN , . 5.6. ACK# REQ#, (REQ/ACK offset agreement). , REQ# (. 5.6, ), , . REQ#, ACK# . ACK# REQ# ( 2), ACK#. , . , ACK# (. 5.6, ).
SCSI-1 , , ( ) ( ) ACK#. , , : REQ# ( ) .
. 5.6. : ;
16 . , .
. , , , , . , , . ( , ), (REQ#/ACK# REQB#/ACKB#), .
Command . Status . Data IN Data OUT . Message IN Message OUT . Message OUT Attention, ATN#, . Message IN .
BSY#, SEL#, REQ# ACK# , C/D#, I/O#, MSG# .
ATN# RST# Attention Reset , . . ATN# , . RST# , Reset . , , . , , , . . , .
- : Bus Free Arbitration Selection Reselection. (Command, Data, Status, Message), Message In, Disconnect Command Complete, Bus Free.
SCSI - (saved SCSI pointers): , . ( ), . , , . . , Save Data Pointer. . , - . Restore Pointers -.
-, .