M69030 Asiliant Technologies, M69030 Datasheet - Page 223

• Manufacturer Part Number: M69030
• Manufacturer: Asiliant Technologies

Specifications of M69030

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Rad Hardened: No
• Lead Free Status / Rohs Status: Supplier Unconfirmed

XRC3
read/write at I/O address 3D7h with index at I/O address 3D6h set to C3h
shared by both pipelines A and B
Note: All four of the registers used in specifying the loop parameters for dot clock 0 (XRC0 - XRC3) must
be written, and in order from XRC0 to XRC3, before the hardware will update the synthesizer’s settings.
This is a form of double-buffering that is intended to prevent fluctuations in the synthesizer’s output as new
values are being written to these registers.
7
6-4
`efmp
A
&
B
Reserved

Reserved
Post Divisor Select
69030 Databook
7
Dot Clock 0 Divisor Select Register
This bit always returns the value of 0 when read.
These three bits select a value that specifies the post divisor, one of the loop parameters
used in controlling the frequency of the output of the synthesizer used to generate dot clock
0. The manner in which these bits are used to choose this value is shown in the table
below:
A series of calculations are used to derive this value and the values for the other loop
parameters given a desired output frequency and a series of constraints placed on different
components within the synthesizer used to generate dot clock 0. See the appendix B for a
detailed description of the process used to derive the loop parameter values.
6
Post Divisor Select
5
6 5 4
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Bits
Extension Registers
4
Post Divisor
Reserved
Reserved
Reserved
16
32
1
2
4
8
3
VCO Loop
Divisor
2
Revision 1.3 11/24/99
1
Reserved
0
14-43