Select/Reselect During Selection/Reselection; Regulated Termination For Ultra Scsi - LSI LSI53C875A Technical Manual

Figure 2.5

Regulated Termination for Ultra SCSI

2.85 V
C1
C2
C3
Note:
1. C1 - 10 F SMT
2. C2 - 0.1 F SMT
3. C3 - 2.2 F SMT
4. J1 - 68-pin, high density "P" connector

2.2.14 Select/Reselect During Selection/Reselection

UC5601QP
(UC5610 for Ultra SCSI)
2
REG_OUT
19
DISCONNECT
UC5603DP
(UC5614 for Ultra SCSI)
14
REG_OUT
6
DISCONNECT
In multithreaded SCSI I/O environments, it is not uncommon to be
selected or reselected while trying to perform selection/reselection. This
SCSI Functional Description
20
TERML1
21
TERML2
22
TERML3
23
TERML4
24
TERML5
25
TERML6
26
TERML7
27
TERML8
28
TERML9
3
TERML10
4
TERML11
5
TERML12
6
TERML13
7
TERML14
8
TERML15
9
TERML16
10
TERML17
11
TERML18
10
TERML1
9
TERML2
8
TERML3
7
TERML4
3
TERML5
2
TERML6
1
TERML7
16
TERML8
15
TERML9
SD0 (J1.40)
SD1 (J1.41)
SD2 (J1.42)
SD3 (J1.43)
SD4 (J1.44)
SD5 (J1.45)
SD6 (J1.46)
SD7 (J1.47)
SDP0 (J1.48)
ATN (J1.55)
BSY (J1.57)
ACK (J1.58)
RST (J1.59)
MSG (J1.60)
SEL (J1.61)
C/D (J1.62)
REQ (J1.63)
I/O (J1.64)
SD15 (J1.38)
SD14 (J1.37)
SD13 (J1.36)
SD12 (J1.35)
SD11 (J1.68)
SD10 (J1.67)
SD9 (J1.66)
SD8 (J1.65)
SDP1 (J1.39)
2-33