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2-12 Functional Description
Once a change in operating mode occurs, the initiator SCRIPTS should
start with a Set Initiator instruction or the target SCRIPTS should start
with a Set Target instruction. The Selection and Reselection Enable bits
(SCSI Chip ID (SCID) bits 5 and 6, respectively) should both be asserted
so that the LSI53C810A may respond as an initiator or as a target. If only
selection is enabled, the LSI53C810A cannot be reselected as an
initiator. There are also status and interrupt bits in the SCSI Interrupt
Status Zero (SIST0) and SCSI Interrupt Enable Zero (SIEN0) registers,
respectively, indicating that the LSI53C810A has been selected (bit 5) or
reselected (bit 4).
Figure 2.3 Active or Regulated Termination
TERML1
TERML2
TERML3
TERML4
TERML5
TERML6
TERML7
TERML8
TERML9
TERML10
TERML11
TERML12
TERML13
TERML14
TERML15
TERML16
TERML17
TERML18
UC5601QP
20
21
22
23
24
25
26
27
28
3
4
5
6
7
8
9
10
11
C1
C2
SD0 (J1.2)
SD1 (J1.4)
SD2 (J1.6)
SD3 (J1.8)
SD4 (J1.10)
SD5 (J1.12)
SD6 (J1.14)
SD7 (J1.16)
SD8 (J1.18)
ATN (J1.32)
BSY (J1.36)
ACK (J1.38)
RST (J1.40)
MSG (J1.42)
SEL (J1.44)
C/D (J1.46)
REQ (J1.48)
I/O (J1.50)
REG_OUT
DISCONNECT
2.85V
2
19
Note:
1. C1 - 10 µF SMT
2. C2 - 0.1 µF SMT
3. J1 - 68-pin, high density “P” connector