M69030 Asiliant Technologies, M69030 Datasheet - Page 228

• 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

14-48
XRC8
read/write at I/O address 3D7h with index at I/O address 3D6h set to C8h
shadowed for pipelines A and B
Note: All four of the registers used in specifying the loop parameters for dot clock 2 (XRC8 - XRCB) must
be written, and in order from XRC8 to XRCB, 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.
7-0
XRC9
read/write at I/O address 3D7h with index at I/O address 3D6h set to C9h
shadowed for pipelines A and B
Note: All four of the registers used in specifying the loop parameters for dot clock 2 (XRC8 - XRCB) must
be written, and in order from XRC8 to XRCB, 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.
7-0
`efmp
A
B
A
B

Dot Clock 2 VCO M-Divisor
Dot Clock 2 VCO N-Divisor Bits 7-0
69030 Databook
7
7
Dot Clock 2 VCO M-Divisor Register
Dot Clock 2 VCO N-Divisor Register
This register provides the M-divisor, one of the loop parameters used in controlling the
frequency of the output of the synthesizer used to generate dot clock 2.
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 2. See appendix B for a
detailed description of the process used to derive the loop parameter values.
This register provides the N-divisor, one of the loop parameters used in controlling the
frequency of the output of the synthesizer used to generate dot clock 2.
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 2. See appendix B for a
detailed description of the process used to derive the loop parameter values.
6
6
5
5
Dot Clock 2 VCO M-Divisor
Dot Clock 2 VCO M-Divisor
Extension Registers
Dot Clock 2 VCO N-Divisor
Dot Clock 2 VCO N-Divisor
4
4
3
3
2
2
Revision 1.3 11/24/99
1
1
0
0