Tandberg Data
Hardware Interface
___________________________________________________________________________
8-6
Tandberg SLR Reference Manual
#
Symbol
Description
Min. (ns)
Max. (ns)
Note
Output
1
tSASTO
-REQ (out) or -ACK (out) assertion period
90
30
15
a
b
c
2
tSNEGO
-REQ (out) or -ACK (out) negation period
90
30
15
a
b
c
3
tSDSO
Data setup to -REQ (out) low or -ACK (out) low
55
25
12
a
b
c
4
tSHDO
Data hold from -REQ (out) low or -ACK (out)
100
35
17
a
b
c
Input
5
tSRASTI
-REQ (in) assertion period
11
d
6
tSRNEGI
-REQ (in) negation period
11
d
7
tSAASTI
-ACK (in) assertion period
11
d
8
tSANEGI
-ACK (in) negation period
11
d
9
tSDSI
Data setup to -REQ (in) or -ACK (in) low
5
10
tSHDI
Data hold from -REQ (in) or -ACK (in) low
11
TABLE NOTES:
The data rates in this table are relative to SE SCSI
a) Normal SCSI (5 megatransfers/sec maximum)
b) Fast SCSI (10 megatransfers/sec maximum)
c) Ultra SCSI (20 megatransfers/sec maximum)
d) Input specification for input cycle and output cycle
Table 8.7 SCSI Synchronous Timing – 8-bit SCSI
-REQ (OUT)
-ACK (OUT)
-SDP1-0
-SD15-0
1
1
2
2
3
4
-REQ (IN)
-ACK (IN)
-SDP1-0
-SD15-0
5
7
6
8
9
10
OUTPUT
INPUT
Figure 8.2 SCSI Synchronous Timing Diagrams