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BBus slave and DMA interface
702
NS9750 Hardware Reference
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
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved
Reserved