Granularity count register, Table 411: grn — granularity count register – Digi NS9750 User Manual
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B B u s s l a v e a n d D M A i n t e r f a c e
7 0 2
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Granularity Count register
Address: 9040 0168
The Granularity Count register controls the value of the granularity counter for
automatic processing modes.
Note:
According to the IEEE 1284 standards spec, the peripheral has a T
p
(500ns)
minimum setup pulse width for some signals. If, for example, the BBus is
set to run at 50 MHz (20ns clock period), the Granularity Count register
should be set to 25 (
0x19
)
[500ns / 20ns]
.
Bits
Access
Mnemonic
Reset
Description
D31:08
R
Reserved
0x0
N/A
D07:00
R/W
grn
0x0
Granularity counter
Determines the number of BBus clock periods between
peripheral signal changes on the IEEE 1284 bus.
Table 411: grn — Granularity Count register
grn
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved
Reserved