Scsi timer one (stime1), Scsi, Timer one (stime1) – LSI 53C810A User Manual
Page 132
5-58
Operating Registers
SEL
Selection Time-Out
[3:0]
These bits select the SCSI selection/reselection time-out
period. When this timing (plus the 200
µ
s selection abort
time) is exceeded, the STO bit in the
register is set. For a more detailed
explanation of interrupts, refer to
Register: 0x49 (0xC9)
SCSI Timer One (STIME1)
Read/Write
R
Reserved
[7:4]
GEN[3:0]
General Purpose Timer Period
[3:0]
These bits select the period of the general purpose timer.
The time measured is the time between enabling and
disabling of the timer. When this timing is exceeded, the
0110
4 ms
3.2 ms
0111
8 ms
6.4 ms
1000
16 ms
12.8 ms
1001
32 ms
25.6 ms
1010
64 ms
51.2 ms
1011
128 ms
102.4 ms
1100
256 ms
204.8 ms
1101
512 ms
409.6 ms
1110
1.024 s
819.2 ms
1111
2.048 s
1.6384 s
1. These values are correct if the CCF bits in the
register are set according to the valid
combinations in the bit description.
HTH[7:4],
SEL[3:0],
GEN[3:0]
1
Minimum Timeout
(40 MHz)
Minimum Timeout
(50 MHz)
7
4
3
0
R
GEN[3:0]
x
x
x
x
0
0
0
0